The FD-Next18 supports automated processes such as automatic
shuttle train operation and speed-dependent switching on and off.
Follow the guidelines in section 2.3 of the manual for detailed
instructions.

4. Outputs and Interfaces

Refer to section 2.4 of the manual for information on the
outputs and interfaces of the FD-Next18.

5. Programming

Programming the FD-Next18 can be done using DCC or Motorola
central units. Follow the steps outlined in section 4 of the manual
for programming instructions.

6. Configuration Settings

Configure variables such as address, speed-dependent switching,
and function mapping as per the guidelines provided in sections 5.1
to 5.5 of the manual.

Frequently Asked Questions (FAQ)

Q: Can the FD-Next18 be used with other types of
interfaces?

A: The FD-Next18 is specifically designed for use with the
Next18 interface.

Q: How can I avoid irreparable damage to the decoder?

A: Refer to section 3.3 of the manual for tips on avoiding
irreparable damage.

Q: Is it possible to connect a backup capacitor or buffer
circuit to the FD-Next18?

A: Yes, section 3.6 of the manual provides guidance on
connecting a backup capacitor or buffer circuit.

“`

View Fullscreen

FD-Next18
nikManual kt ro Function Decoder with ele Next18 interface

Item no. 42-01194

tam MM DCC DCC-A

tams elektronik
n n n

FD-Next18

tams elektronik

Version: 1.0 | Status: 08/2024
© Tams Elektronik GmbH All rights reserved, in particular the right of reproduction, distribution and translation. Copies, reproductions and alterations in any form require the written permission of Tams Elektronik GmbH. We reserve the right to make technical changes.
ik Printing the manual n The formatting is optimised for double-sided printing. The standard page size is DIN A5. If
you prefer a larger display, printing on DIN A4 is recommended.
r o Notes on standards t The following RailCommunity standards are mentioned in this manual: k RCN-118 “Next18 / Next18-S decoder interfaces” le RCN-217 “DCC feedback protocol RailCom”
RCN-218 “DCC-A – Automatic registration”
e RCN-227 “DCC Extended Function Assignment”
RCN-600 “SUSI-Bus Module Extension Interface”
s The standards are published at: www.railcommunity.org m Notes on RailCom® a RailCom® is a German trademark registered in the name of Lenz Elektronik for class 9 t “Electronic Controls” under number 301 16 303 and a trademark registered for classes 21, 23,
26, 36 and 38 “Electronic Controls for Model Railways” in U.S.A. under Reg.No. 2,746,080. To enhance the readability of the text, we have refrained from referring to the term each time it is used.
**Products of other manufacturers This manual mentions the following companies: Gebr. MÄRKLIN & Cie. GmbH Stuttgarter Str. 55-57 | DE-73033 Göppingen
2 | Contents

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FD-Next18

Contents

1. Getting started……………………………………………………………………………………………….5 1.1. Contents of the package……………………………………………………………………………5 1.2. Required accessories………………………………………………………………………………..5 1.3. Intended use………………………………………………………………………………………….6 1.4. Safety instructions……………………………………………………………………………………6

2. The FD-Next18 function decoder………………………………………………………………………..7

2.1. Digital operation………………………………………………………………………………………7

2.2. Analogue mode……………………………………………………………………………………….8

2.3. Automated processes……………………………………………………………………………….9 2.3.1. Automatic shuttle train operation based on the ABC method……………………..9
ik 2.3.2. Speed-dependent switching on and off…………………………………………………9
2.4. Outputs and interfaces…………………………………………………………………………….10
n 2.5. Triggering the actions……………………………………………………………………………..12 o 2.6. Feedback with RailCom……………………………………………………………………………13 r 2.7. Automatic registration according to RCN-218 (DCC-A)……………………………………13 t Connections…………………………………………………………………………………………………15 k 3.1. Safety instructions………………………………………………………………………………….15
3.2. Safe and correct soldering………………………………………………………………………..16
le 3.3. Avoiding irreparable damage to the decoder!……………………………………………….17 e 3.4. Pin assignment FD-Next18 | Front side……………………………………………………….18

s 3.5. Pin assignment FD-Next18 | Rear side………………………………………………………..19
3.6. Connecting a backup capacitor or buffer circuit…………………………………………….19

4. 5.

Programming………………………………………………………………………………………………..20 4.1. Programming with DCC central units…………………………………………………………..20
m 4.2. Programming with Motorola central units…………………………………………………….21 t a Configuration variables and registers………………………………………………………………….22

5.1. Overview configuration variables FD-Next18…………………………………………………22

5.2. Basic settings………………………………………………………………………………………..24

5.3. Setting the address…………………………………………………………………………………25

5.4. Settings for speed-dependent switching………………………………………………………26

5.5. Function mapping…………………………………………………………………………………..27

5.6. Effects of the outputs……………………………………………………………………………..33

5.7. RailCom and DCC-A settings……………………………………………………………………..36

5.8. Settings for driving operation……………………………………………………………………37

5.9. Settings for analogue mode……………………………………………………………………..38

5.10. Auxiliary functions………………………………………………………………………………….39

5.11. Information…………………………………………………………………………………………..39

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6. Checklist for troubleshooting and error correction…………………………………………………40 6.1. Problems with programming the decoder…………………………………………………….40 6.2. Problems in driving mode…………………………………………………………………………40 6.3. Problems with the feedback of the decoder………………………………………………….41 6.4. Problems when switching functions……………………………………………………………41 6.5. Problems in analogue mode……………………………………………………………………..42 6.6. Technical Hotline……………………………………………………………………………………43 6.7. Repairs………………………………………………………………………………………………..43
7. Technical data………………………………………………………………………………………………44
8. Warranty, EU conformity & WEEE……………………………………………………………………..46 8.1. Guarantee bond…………………………………………………………………………………….46 8.2. EU Declaration of Conformity……………………………………………………………………47
elekt r on ik 8.3. Declarations on the WEEE Directive……………………………………………………………47 s
tam

4 | Contents

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FD-Next18

1. Getting started
This manual will help you step by step to mount and commission the decoder safely and correctly. Before you connect the decoder and put it into operation, please read this manual completely, particularly the chapter on safety instructions and the checklist for trouble shooting. You will then know where to take care and how to prevent mistakes which take a lot of effort to correct. Keep this manual safely so that you can solve problems in the future. If you pass the decoder on to another person, please pass on the manual with it.
1.1. Contents of the package
one function decoder with Next18 interface. N.B. For technical reasons it is possible that the
PCB is not completely inserted. This is not a fault.
ik 1.2. Required accessories n Tools and consumables
To connect a backup capacitor or a buffer circuit, you need:
o a soldering iron with temperature control and a thin tip and a deposit stand or a controlled r soldering station t a scraper, rag or sponge k a heat-resistant pad le a small pair of side cutters and wire strippers
tweezers and flat-nose pliers if necessary
e electronic solder (preferably 0.5 to 0.8 mm diameter) s stranded wires (> 0,05 mm² for the connections to the backup capacitor)
Bridging power interruptions To bridge short current interruptions you need:
m an electrolytic capacitor: capacity: 100 to 220 µF | proof voltage: > 25 V
t a or a buffer circuit that does not necessarily have to be connected to the special control output for buffer circuits of vehicle decoders, e.g. USV-mini 0.47 (capacity 0.47 F, item no. 70-02215 or 70-02216) USV mini 1.0 (capacity 1.0 F, item no. 70-02225 or 70-02226) USV mini 1.5 (capacity 1.5 F, item no 70-02235 or 70-02236).
Use in vehicles without Next18 interface As the decoder (with the exception of the connections for a support capacitor) has no solder connections, you will need an adapter board if you want to use it in a vehicle without a Next18 interface, e.g.
Next18 adapter item no. 70-01050 or 70-01051

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FD-Next18

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1.3. Intended use
The function decoder FD-Next18 is designed to be operated according to the instructions in this manual in model building, especially in digital model railroad layouts. Any other use is inappropriate and invalidates any guarantees. The function decoder should not be mounted by children under the age of 14. Reading, understanding and following the instructions in this manual are mandatory for the user.
1.4. Safety instructions
! The FD-Next18 function decoder is equipped with integrated circuits (ICs). These are sensitive to electrostatic charge. Therefore, do not touch the decoder until you have “discharged” yourself. For this purpose, e.g. a grip on a radiator is sufficient.
ik Improper use and non-observance of the instructions can lead to incalculable hazards. Prevent n these dangers by carrying out the following measures:
Only carry out installation work when the decoder is de-energised.
o Only carry out installation work in closed, clean and dry rooms. Avoid moisture, wetness r and splashing water in your working environment. t Supply the decoder only with extra-low voltage as specified in the technical data. Only use k tested and approved transformers or power supply units for this purpose.
Only plug the mains plugs of transformers / power supply units and soldering irons /
le soldering stations into professionally installed and fused earthed sockets. e Do not expose the decoder to high ambient temperatures or direct sunlight. Observe the s information on the maximum operating temperature in the technical data.
If you notice damage or malfunctions, switch off the supply voltage immediately. Send the
t am decoder in for inspection.

6 | Getting started

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FD-Next18

2. The FD-Next18 function decoder

2.1. Digital operation
The function decoder FD-Next18 is a multiple protocol decoder, that can operate with and automatically recognise both DCC or Motorola formats.

DCC according to NMRA and RCN-standard

Motorola II (MM II)

Number of

127 basic addresses or 10.239

255

addresses

extended addresses

Speed level modes Number of functions
Programming

14, 28 or 128

MM II: 14 or 27b

in 28/128 speed level mode: SDF*

ik 29 n (F0 to F28)

5 or 9 (F0 to F4) (via 2nd address: F5 to F8)

o Configuration variables: r Direct programming on the t programming track (DCC conform) k or le PoM (Programming on Main e = main track programming)

Registers

s * Background info: SDF (Speed Direction Function)
This procedure is used to reduce the time required to transmit speed, direction and function

commands to vehicle decoders in DCC format. Instead of transmitting the various commands
individually, all commands are summarised and transmitted in a single command.
m The reduction in transmission time has a particularly positive effect on systems where a large
number of decoders with many functions are used.
t a The prerequisites for using this method are:

the use of a digital control unit that supports SDF

the installation of vehicle decoders that support SDF

setting the speed step mode 28 / 128 on the decoder.

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FD-Next18

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2.2. Analogue mode
The function decoder FD-Next18 can also be used in analogue model railway layouts run with a DC speed control.
Automatic analogue recognition When putting the vehicle on the rails the decoder recognizes automatically if it is run in analogue or digital mode and sets the corresponding operation mode. The automatic analogue recognition can be switched off, e.g.
if the decoder suddenly switches to analogue mode in digital operation (e.g. as a result of
interference voltages whose cause is difficult to localise);
if a value for the Packet Time Out is programmed.
Switching the function outputs in analogue mode
ik Switching the function outputs on or off is not possible in analogue mode. The outputs can be
programmed with the digital central unit so that they are either switched on or off in analogue
n mode. The effects set for the outputs are active in analogue mode as well.
Outputs that are switched depending on the direction are switched on or off in analogue mode
o according to the direction of travel. When operated in analogue d.c. layouts this applies only to r lamps or accessories where the return conductor is connected to the decoder´s common return elekt conductor for all function outputs.
s tam

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FD-Next18

2.3. Automated processes
2.3.1. Automatic shuttle train operation based on the ABC method
The FD-Next18 function decoder can be used together with a locomotive decoder in a train set that uses the ABC braking method to automate shuttle operation between two terminus stations. If the ABC braking method and shuttle operation based on the ABC method are activated for the FD-Next18, it switches the direction-dependent lights according to the actual direction of travel. If not activated, the lights remain switched on in shuttle mode according to the direction of travel set on the digital control unit.
2.3.2. Speed-dependent switching on and off
All function outputs for which the function is activated are automatically switched when a
ik voltage defined in the associated CV is reached. It is possible
to switch the output off when the voltage is exceeded and to switch it on when the voltage
n falls below the voltage or o to switch the output switch on when the voltage exceeds the limit and switch off when the r voltage falls below it. t The voltage is set for all outputs together. k In order to correctly switch the function outputs of the FD-Next18 according to the actual
speed level specified by the locomotive decoder in the train set, the following settings are
le required for the FD-Next18: e acceleration and brake delay s speed characteristic
constant braking distance
t am The settings must correspond to those of the locomotive decoder in the train set.

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FD-Next18

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2.4. Outputs and interfaces

Function outputs and SUSI interface
In accordance with the RailCommunity standard RCN-118, which describes the Next18 interface, the FD-Next18 has six outputs:
4 amplified function outputs (F0f, F0f, AUX1 and AUX2) for switching loads with a
maximum load capacity of 100 mA each
2 unamplified outputs (AUX5 and AUX6)

In addition, the FD-Next18 has two further connections which, depending on the CV settings,

can be used as

2 further unamplified outputs (AUX3 and AUX4) or
connections to a train bus, e.g. “Data (DATA)” and “Clock (CLOCK)” of the SUSI interface
ik When used for the SUSI interface, the function decoder transmits the status of the functions
and the speed level set on the control unit. This allows, for example, speed-dependent
n functions of the SUSI module to be influenced.
Function mapping according to RCN-227
r o Assigning the functions to the outputs follows RailCommunity standard RCN-227. It is possible t to assign one or several outputs to each function (F0 to F28, seperately for forward and
backward motion for each function). In addition, it is possible to assign another function as an
k “OFF”-switch to the functions. le This mode of function mapping allows to implement special features, e.g.:
Switching on and off depending on the direction of travel.
e Shunting light: When switching to shunting operation the signals for shunting operation are s switched on and those for standard operation switched off.
Switching off the locomotive´s rear lights when connecting wagons.

Effects of the function outputs
m Direction-dependent switching: Assignment separately for each t a output.
Shunting light: Assignment separately for each output.

Function Mapping Function Mapping

Dimming (only F0f, F0r, AUX1 and AUX2): The voltage at the output is reduced. Assignment separately for each output.
Application example: By reducing the voltage, the lamps of older vehicles intended for analogue operation can continue to be used in digital operation and therefore do not have to be replaced after the decoder has been installed.

CV programming CV 47…50

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FD-Next18

Effects of the function outputs

Inverted switching: When set to “on” the assigned output is switched off, when set to “off” it is switched on. Assignment separately for each output.

CV programming CV 55…62

Flashing: The voltage at the output is switched on and off

CV programming

alternately. Assignment separately for each output. Setting the flashing frequency together for two outputs.

CV 55…62 CV 101…104

By assigning the flashing function to two outputs and the function

“Inverted switching” to one of the two outputs, an alternating

flashing is generated.
Successive dimming up and down (only F0f, F0r, AUX1 and
ik AUX2): The voltage at the output is gradually increased when
switched on or gradually reduced when switched off.
n Assignment separately for each output. Setting the time duration for
dimming up and down together for all outputs to which the function
o is assigned. t r Application example: Simulation of old oil or incandescent lamps. k MARs-Light (only F0f, F0r, AUX1 and AUX2): To generate the
additional warning light typical of American locomotives (fading in
le and out at short intervals), the following settings must be made for
the output:
e flashing and successive dimming up and down active
short flashing frequency
s short time for dimming up and down

CV programming CV 55…58 CV 100
CV programming CV 55…58 CV 100
CV 101…102

Assignment separately for each output. Setting the flashing frequency together for two outputs. Setting the time duration for
m dimming up and down together for all outputs to which the function t a is assigned.

Kicking: The output first receives full voltage for a maximum of

CV programming

approx. 25.5 seconds and is then switched off.

CV 55…62

Assignment separately for each output. Setting the kick time (= time during which the maximum voltage is applied to the output)

CV 99

together for all outputs to which the function is assigned.

Application example: Some types of electrical couplings require full voltage for decoupling. After uncoupling, however, the voltage is switched off to protect the couplings.

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FD-Next18

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Effects of the function outputs

Fire simulation (only F0f, F0r, AUX1 and AUX2): The voltage at the output is reduced / increased in short, irregular intervals, connected LEDs or lamps produce the flickering light typical for an open fire. Assignment separately for each output.
Application example: Simulation of the fire in the firebox of steam locomotives.

CV programming CV 55…58

On/Off at a defined voltage (speed): By default, the output is

CV programming

switched off when the voltage is exceeded and switched on again

CV 55…62

when it falls below. The function can be reversed by inverting the

CV 63

function. Assignment separately for each output. Setting the voltage together
ik for all outputs to which the function is assigned.
Application example: automatic switching on and off of the driver’s
n cab lighting at a certain voltage. o Connection for backup capacitor or buffer circuit r The FD-Next18 has an additional connection for an external backup capacitor or a buffer t circuit, but no special control output for buffer circuits. Suitable for bridging short-term current k interruptions:
Electrolytic capacitors with a capacity of 100 to 220 µF and a dielectric strength of at least
le 25 V or e Buffer circuits that do not necessarily have to be connected to the special control output s for buffer circuits of a vehicle decoder (e.g. UPS mini)
2.5. Triggering the actions

The switching on and off of the function outputs as well as the (de)activation of the special
m functions is carried out by the assigned function(s). a Assignment of actions to functions (function mapping) t The assignment of the actions controlled by the decoder to the functions is freely selectable,

separately for forward and reverse motion.

Actions

DCC format

MM format

Outputs F0f, F0r, AUX1 … AUX6 on/off Shunting gear (SG) active/inactive Acceleration and brake delay (ABD) active/inactive

F0 to F28

F0 to F4
F5 to F8 with 2nd address

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FD-Next18

2.6. Feedback with RailCom
RailCom transmitter The function decoder FD-Next18 is a RailCom transmitter and fulfils the requirements of the RailCommunity standard RCN-217 “RailCom DCC feedback protocol” for mobile decoders (vehicle decoders). Sending RailCom messages is possible in layouts with a DCC signal on the rails only. It is not possible to use the RailCom-function in a pure Motorola environment.
Background information: RailCom-messages of vehicle decoders In channel 1, the vehicle decoders transmit their DCC address after each DCC command directed to any vehicle decoder. Channel 1 can be set “dynamically”, i.e. the decoder will only transmit its address in channel 1 until a DCC command is directed to it. This frees the
ik channel for the messages of other decoders to which no command has yet been sent or
which are not yet known to the system. In channel 2, vehicle decoders send their feedback as soon as a DCC command is sent to
n their address. o Background information: Dynamic RailCom information t r “Dynamic information” mean contents of CVs (RailComCVs 64 – 127) which change during
operation (e.g. real speed, reception statistics, tank content). If needed, they are sent by the
k decoder spontaneously. le The reception statistics are kept by the vehicle decoder, and reported as number of faulty
data packages in relation to the total number of data packages. These statistics allow
e conclusions on the transmission quality between vehicle and rails. s Dynamic RailCom information of the function decoder
The function decoder FD-Next18 can send the following dynamic RailCom information: reception statistics
m 2.7. Automatic registration according to RCN-218 (DCC-A) t a DCC-A is an automatic registration procedure for DCC, with which the essential characteristics
of a decoder are transmitted to the digital central unit immediately after the vehicle has been rerouted and are directly available there. The assignment of addresses and the allocation of functions is thus considerably simplified.
Notes for the use of DCC-A Prerequisite for the use is the use of a digital central unit that also supports the procedure. The automatic registration can be deactivated in CV 28. However, for trouble-free operation with digital central units that do not support DCC-A, it is irrelevant whether the registration procedure is activated or not.

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FD-Next18

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Transfer of decoder parameters in the DCC-A registration procedure
The registration of the decoder with the central unit takes place automatically as soon as the vehicle is placed on the track. Some of the parameters can be adjusted individually with the help of the central unit.

Value

Adjustments

Principle symbol and symbol

e.g.:

The decoder can be assigned a principle symbol and a symbol from the file stored in the central unit.

Desired address
Address
Name and short name Product name Description Manufacturer UID Protocol
Version SW Version HW registered

3
e.g. 1000
FD-Next18
FD-Next18 –Tams Elektronik
s e.g. 12345678
e.g. DCC/28
m e.g. V2.00 t ae.g. V1.0

Address according to the settings in CVs 1 or 17/18
ik The address is assigned to the decoder by the
control unit. If no vehicle decoder with the same address is available, the desired address
n set in the CVs is adopted. o The decoder can be assigned its own name r and/or short name (max. 8 characters). t no change possible k no change possible eleno change possible
no change possible
Protocol according to the assignment in the locomotive database / locomotive list of the control unit
no change possible
no change possible

DCC-A

Method by which the decoder was registered with the control unit

Functions and function icons

Specific icons can be assigned to the functions, from which it is clear what they switch (e.g. front lighting, interior lighting, shunting gear).

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FD-Next18

3. Connections
3.1. Safety instructions
! Caution: Integrated circuits (ICs) are inserted on the decoder. They are sensitive to static electricity. Do not touch components without first discharging yourself. Touching a radiator or other grounded metal part will discharge you.
Mechanical hazards Cut wires can have sharp ends and can cause serious injuries. Watch out for sharp edges when you pick up the PCB. Visibly damaged parts can cause unpredictable danger. Do not use damaged parts: recycle
ik and replace them with new ones.
Electrical hazards
n Touching powered, live components, o touching conducting components which are live due to malfunction, r short circuits and connecting the circuit to another voltage than specified, t impermissibly high humidity and condensation build up
can cause serious injury due to electrical shock. Take the following precautions to prevent this
k danger: le Never perform wiring on a powered module.
Only install the decoder in closed, clean, dry rooms. Beware of humidity.
e Supply the decoder only with extra-low voltage as specified in the technical data. Use only tested and approved transformers or power supply units.
s Connect transfor transformers / power supply units mers and soldering irons only in approved mains sockets installed by an authorised electrician.
Observe cable diameter requirements.
m After condensation has formed, wait up to 2 hours for acclimatisation before working. t a Fire risk
Touching flammable material with a hot soldering iron can cause fire, which can result in injury or death through burns or suffocation. Connect your soldering iron or soldering station only when actually needed. Always keep the soldering iron away from inflammable materials. Use a suitable soldering iron stand. Never leave a hot soldering iron or station unattended.

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FD-Next18

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Thermal danger
A hot soldering iron or liquid solder accidentally touching your skin can cause skin burns. As a precaution:
use a heat-resistant mat during soldering, always put the hot soldering iron in the soldering iron stand, point the soldering iron tip carefully when soldering, and remove liquid solder with a thick wet rag or wet sponge from the soldering tip.

Dangerous environments

A working area that is too small or cramped is unsuitable and can cause accidents, fires and

injury. Prevent this by working in a clean, dry room with enough freedom of movement.

Other dangers
ik Children can cause any of the accidents mentioned above because they are inattentive and
not responsible enough. Children under the age of 14 should not be allowed to mount vehicle decoders.
n ! Caution: o Little children can swallow small components with sharp edges, with fatal results! Do not r allow components to reach small children. k t In schools, training facilities, hobby and self-help workshops, the assembly, installation and
operation of electronic modules must be supervised by trained personnel.
le In commercial facilities, the relevant accident prevention regulations must be observed. e 3.2. Safe and correct soldering

! Caution:

Incorrect soldering can cause dangers through fires and heat. Avoid these dangers by reading and following the directions given in the chapter Safety instructions.
m Use a soldering iron with temperature control, which you set to approx. 300 °C. a Only use electronic solder with a flux. t Never use soldering fluid or soldering grease when soldering electronic circuits. These

contain an acid that destroys components and conductor paths.

Solder quickly: Soldering for too long can detach solder pads or tracks or even destroy
components.

Hold the soldering tip on the soldering point so that it touches the wire and the pad at the
same time. Add (not too much) solder simultaneously. As soon as the solder begins to flow, remove it from the soldering point. Then wait a moment for the solder to flow well before removing the soldering iron from the soldering joint.

Do not move the created solder joint for about 5 seconds.

A clean, non-oxidized soldering tip is essential for a perfect soldering joint and good
soldering. Therefore, before each soldering, wipe off excess solder and dirt with a damp sponge, a thick damp cloth or a silicone wiper.

16 | Connections

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FD-Next18

After soldering, check (preferably with a magnifying glass) whether connections or tracks
have been bridged with solder by mistake. This can lead to malfunction or destruction of components or, in the worst case, the complete circuit. You can re-liquefy excess solder with the clean hot soldering tip. The solder then flows from the board onto the soldering tip.
3.3. Avoiding irreparable damage to the decoder!

! Caution: To avoid (in the worst case) irreparable damage to the decoder , observe the following instructions:
1. No conductive connections to metal parts or rails! Avoid all conductive connections between the decoder or consumers connected to the return conductor for all functions on the one hand, and metal parts of the vehicle or the rails on the
ik other hand. Connections are caused e.g. by insufficiently insulated connecting cables (even
at the stripped ends of unused connecting cables!) or insufficient fastening and insulation of
n the decoder or consumers. Danger of short circuit!
2. No connection of the return conductor to vehicle ground!
r o You should under no circumstances connect the decoder´s common return conductor for all
function outputs to vehicle ground. Risk of short circuit!
t 3. Exclude overload! k Before connecting lights and additional accessories, check that the current is below the le maximum permissible values and that the total current is not exceeded. If the permissible
current is exceeded, the decoder may be damaged during commissioning.
e 4. Do not use AC driving transformers! s The decoder can be used in analogue systems that are supplied with direct current. If the
decoder is supplied with alternating current in analogue operation, components on the
t am decoder may be irreparably damaged!

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3.4. Pin assignment FD-Next18 | Front side
The FD-Next18 function decoder has a Next18 interface corresponding to RCN-118 for connection to vehicles that are equipped with a corresponding interface at the factory. You can use the decoder in vehicles without a Next18 interface if you connect an additional adapter board (e.g. item no. 70-01050 or 70-01051).

! Please note:

In principle, it is possible to use the FD-Next18 in vehicles that are not equipped with a Next18

interface at the factory. In this case, take the electrical properties of the connections into

account and ensure that the permissible values are not exceeded. Otherwise the decoder may

be damaged (possibly irreparably).
FD-Next18
Front side
Next18 interface Assignment according to RCN-118 Right current collector not used AUX1 (function F1)

t r onik Connection Next18 interface kAssignment according to RCN-118

le 1

18 Right current collector

17 F0r = Lighting backward motion

e (function F0)

s 3

16 AUX5 (function F7)

AUX3 (function F5) or SUSI CLOCK GND
m U+ t a AUX6 (function F8)

4 5 6 7

15 U+ 14 GND 13 AUX4 (function F6) or SUSI DATA 12 AUX2 (function F2)

F0f = Lighting forward motion (function F0)

11 not used

Left current collector

10 Left current collector

18 | Connections

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3.5. Pin assignment FD-Next18 | Rear side
FD-Next18
Rear side

FD-Next18

V+

Positive pole (+) for backup capacitor or buffer circuit (UPS)

GND

Minus pole (-) for backup capacitor or buffer circuit (UPS)

ik 3.6. Connecting a backup capacitor or buffer circuit n In sections with bad contact to the rails (e.g. when running over turnouts) or with a (e.g.
construction-related) bad current consumption of the locomotive, the power supply of the
o decoder can be interrupted briefly. In analogue mode the effects are usually small, but in r digital mode massive disturbances can be the result: e.g. flickering of the lights up to t automatic switching to analogue mode. This can be remedied by connecting a backup k capacitor or a special buffer circuit.
Connection of a backup capacitor
le The electrolytic capacitor must have a capacity of at least 100 µF and a maximum of 220 µF. e The minimum proof voltage is 25 V.

s Pay attention to the correct polarity when connecting!

tam

Connection of a backup capacitor

Connections | 19

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Connection of a buffer circuit
The capacity of buffer circuits is considerably larger than that of backup capacitors (e.g. UPSmini with 0.47 F, 1.0 F or 1.5 F). Use a buffer circuit that does not necessarily have to be connected to the special control output for buffer circuits of a vehicle decoder, e.g. UPS-mini (item numbers 70-0221x, 70-0222x, 70-0223x).

Connection of a buffer circuit that can be used without connecting a control line (e.g. UPS-mini)
onik 4. Programming t r 4.1. Programming with DCC central units k From the control unit you can program the configuration variables (CVs) of the decoder, main
track programming is also possible. Please refer to the relevant section in the instructions of
le your control unit, which describes the byte-by-byte programming of the CV variables (Direct e Programming) or the main track programming (PoM). s Register programming is not supported by the FD-Next18. You cannot program the decoder
with DCC control units that only allow register programming.
tam

20 | Programming

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FD-Next18

4.2. Programming with Motorola central units

In Motorola format the settings are saved in registers. The registers have the same numbers as the configuration variables (CVs) for the DCC format.
Please note: If you use a central unit for both DCC and Motorola format it is recommended to program the decoder in the DCC format. After having finished programming the decoder it is possible to control it in Motorola format as well.
Please note: You should connect a lamp or a LED to at least F0f or F0r before starting to program the decoder with a Motorola central unit, as the decoder shows the status of the programming by flashing the lighting connected to these outputs. The flashing frequency shows, which input the decoder expects:

Slow flashing

Fast flashing

ik Number of the register to be programmed Value of the register to be programmed

Put the vehicle on a track oval or a track section connected to the central unit’s track output (not
n to the connection for the programming track). Make sure no other vehicle than the one you
intend to program is set on the track as the decoder inside this vehicle might be programmed as
o well.

t r Starting k the programming mode le 1. Switch on the central unit or perform
a reset at the central unit (pushing “stop”
e and “go”) simultaneously.

Programming the decoder
1. Enter the number of the register as a Motorola-address.
If necessary: with a leading “0”.

s 2. Set the current decoder address
(default value: 3) or the address “80”.

2. Operate the direction switch. Lighting flashes faster.

3. Set all functions to “off”.
m 4. Push button “stop”
switch off the track voltage.
t a 5. Operate the direction switch

3. Enter the value you want to set into the register (as Motorola-address).
4. Operate the direction switch. Lighting flashes more slowly.

and hold it in that position.

If necessary: repeat steps 1 to 4 for all

Push the button “go” at once.

registers to be programmed.

6. As soon as the lighting flashes, release the direction switch.

Push button “STOP”.

Start of programming mode

End of programming mode

Programming with the Central Station I and the Mobile Station
With the Central Station I and the Mobile Station from Märklin** you can program the registers by calling up the item no. 29750 from the locomotive database. Then program the decoder as described for this item no. in the instructions for the digital controls.

Programming | 21

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5. Configuration variables and registers
The following lists shows all configuration variables (for the DCC format) and registers (for the Motorola format), that can be set for the function decoder. Registers and configuration variables (CVs) have identical numbers, they are shown in the tables in the column “No.”. The defaults are those values set in the state of delivery and after a reset. Please note: With variables destined to set several parameters, the input value has to be calculated by adding the numerical values assigned to the desired parameters.

5.1. Overview configuration variables FD-Next18

No. 1 2 3
4 5 6 7 8
10

Name
ik Basic address
Starting voltage (starting velocity
n Acceleration rate
(start-up deceleration)
r o Braking rate (braking deceleration) t Maximum voltage (maximum velocity) k Medium voltage (center speed) le Version
Reset | Manufacturer
s e Dynamic RailCom information

Section of the manual 5.3. Setting the address
5.4. Settings for speed-dependent switching
5.11. Information 5.10. Auxiliary functions 5.11. Information 5.7. RailCom and DCC-A settings

11 12 13

Packet Time Out Permitted modes of operation
m Functions active in analogue mode t a (F1 to F8)

5.8. Settings for driving operation 5.11. Information 5.9. Settings for analogue mode

Functions active in analogue mode

5.9. Settings for analogue mode

(F0, F9 to F12)

15 and 16 Decoder lock

5.10. Auxiliary functions

17 and 18 Extended address

5.3. Setting the address

Consist address

5.3. Setting the address

2nd Motorola address

5.3. Setting the address

Functions active in consist operation 5.8. Settings for driving operation

(F1 to F8)

Functions active in consist operation 5.8. Settings for driving operation

(F0, F9 to F12)

22 | Configuration variables and registers

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FD-Next18

No.

Name

Section of the manual

RailCom channels

5.7. RailCom and DCC-A settings

Configuration data 1

5.2. Basic settings

31 and 32 Index for higher CV-Pages

5.5. Function mapping

47…50

Dimming of the outputs

5.6. Effects of the outputs

55…62

Assignment of the effects to the outputs

5.6. Effects of the outputs

Voltage for switching outputs on/off 5.6. Effects of the outputs

67…94
96 99 100 101…104 121 122 123…127
257…485

Alternative characteristic curve

5.4. Settings for speed-dependent

(only for mode 28 speed steps)
Method for function assignment
ik Kicking time (“moment-function”) n Dimming up and down the outputs o Flashing frequency r Configuration data 2 t ABC sensitivity k Reserved for registration via DCC-A
Values must not be changed!
le Assignment of outputs and special e functions to the functions

switching 5.11. Information 5.6. Effects of the outputs 5.6. Effects of the outputs 5.6. Effects of the outputs 5.2. Basic settings 5.8. Settings for driving operation Values must not be changed!
5.5. Function mapping

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Configuration variables and registers | 23

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5.2. Basic settings

Name

No. Input values Remarks and tips (Default)

Configuration

29 0 … 255 (14) Direction “Standard”

data 1

Direction inverted

14 speed levels

28 or 128 speed levels (in DCC format)

Note: If you want to use the SDF method,

you must set the 28/128 speed level mode.

( section 2.1) Note: If the decoder is run in Motorola format, the setting of the speed step mode has no effect.
ik Automatic analogue recognition off n Automatic analogue recognition on o RailCom off r RailCom on t Linear velocity characteristic k Alternative velocity haracteristic le Basic addresses
Extended addresses (for DCC format only)
eTip: If the use of extended addresses is activated in

0 4
0 8
0 16
0 32

s CV 29, the decoder does not react to signals in Motorola format!

Example: CV 29 = 0 | Meaning: Direction = “Standard”. 14 speed levels . Automatic analogue recognition = “off”. RailCom =”off”. Linear velocity characteristic. Basic addresses.
m Example: CV 29 = 14 | Meaning: a Direction = “Standard”. 28 or 128 speed levels in DCC mode. Automatic analogue recognition = “on”. t RailCom =”on”. Linear velocity characteristic. Basic addresses.

Notes: Setting the speed characteristic (linear or alternative) is only necessary if outputs are to be switched depending on the speed. Adopt the input values from the CVs of the locomotive decoder in the train set.

24 | Configuration variables and registers

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FD-Next18

Name

No. Input values (Default)

Remarks and tips

Configuration data 2

121 0, 4, 8, 12, 16 Use of contacts 4 and 13:

… 60

unamplified outputs AUX3 and AUX4

(4)

Train bus / SUSI CLOCK and SUSI DATA 1 1

Reaction to ABC braking method:

ABC braking method active

ABC braking method inactive

Inverted ABC detection

Constant braking distance inactive

Constant braking distance active

ik Shuttle train operation inactive

Shuttle train operation active

n Notes:
The settings for the ABC braking section and shuttle operation are only required if the decoder is used
o together with a locomotive decoder in a train set for which shuttle operation based on the ABC braking r method is activated. The settings for the constant braking distance are only required if outputs are to be t switched speed-dependent and the constant braking distance is activated for the locomotive decoder in
the train set.

lek 5.3. Setting the address

e Name

No. Input values

Remarks and tips

Basic address

s(Default)
1 … 255 (3)

Range of values:

in DCC format: 1 … 127 in MM format: 1 … 255
m Tip: If a value higher than 127 is set for the basic address and the use of extended addresses in CV 29 is t a set to off, the decoder does not react to signals in DCC format!

Extended address 17 Only for DCC format.
18

192 … 255 (195)
0 … 255 (232)

Most central units permit entering extended addresses directly. The CVs 17, 18 and 29 are set automatically to the proper values.

Consist address

Only for DCC format.

1 … 127 (0)

Address for consist operation (multi-traction)

2nd Motorola address

0 … 255 (4)

= Address needed to switch additional

functions in Motorola format. The function

keys F5 to F8 are reached via the function

keys F1 to F4, the function key F9 via the

function key F0.

Configuration variables and registers | 25

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5.4. Settings for speed-dependent switching
The settings are only required if outputs are to be switched depending on the speed. Adopt the input values from the CVs of the locomotive decoder in the train set.

Name

No. Input values (Default)

Remarks and tips

Starting voltage

(starting velocity)

0 … 255 (4)

= Voltage to be output to the motor at speed level 1.

0 = 0 Volt

255 = max. voltage

Acceleration rate 3 0 … 255 (10) = Length of the delay before the switching to

(start-up

the next higher / lower speed level when the

ik deceleration)

locomotive is accelerating / braking.The delay

Braking rate
n (braking o deceleration)

is calculated as follows: 4 0 … 255 (5)
(value of the CV) x 0,9 sec. number of speed levels

r If constant braking distance ( CV 121) is active, the setting only applies to the highest speed step (14, t 28 or 128). If the braking process is triggered at a lower speed level, the waiting time until switching to
the next lower speed level is automatically extended. This ensures that the braking distance is always the
k same regardless of the speed level when the braking process is started.

le Maximum voltage 5
(maximum
s e velocity)

0 … 255 (255)

= Voltage to be output to the motor at the highest speed level.
2 = 0,8 % of the max. voltage 255 = maximum voltage

Medium voltage (center speed)
Alternative

6 0 … 255 (100)
t am 67 0 … 255

= Voltage at speed level 7 (14-speed mode) or 14 (28-speed mode)
= Speed table for alternative speed

characteristic curve 68

characteristic.

(only for mode 28 69

speed steps)

…

A specific motor voltage is assigned to each of the 28 speed steps.

0 = voltage of “0

255 = maximum voltage

Note: An example of an alternative characteristic curve is set in the default values of CVs 67 94.

26 | Configuration variables and registers

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FD-Next18

5.5. Function mapping

The assignment of the actions controlled by the decoder
switching the function outputs on and off (de)activation of the special function “Acceleration and brake delay (ABD)”
to the functions is carried out according to RailCommunity standard RCN-227.
Note: Setting the acceleration and brake delay is only necessary if outputs are to be switched speed-dependent. Adopt the input values from the CVs of the locomotive decoder in the train set.
Note: The use of the function mapping is not possible with pure Motorola control units.

Basic settings for using the function mapping To get access to the corresponding memory area (the so-called “page”), the values for
ik “Function mapping” must be set in CV 31 and 32 (= default values).

Name

No. Input values (Default)

Remarks and tips

n Index for o higher pages

0 … 255 (0)

0 … 255 (42)

Function mapping active

t r Configuration variables for function mapping k According to RCN-227, eight configuration variables (CVs) are assigned to each function (F0 to
F28): four each for forward (“f”) and reverse (“r”). Six of these are used for the FD-Next18
le function decoder (3 for forward and 3 for reverse): e 2 CVs for the outputs (F0f, F0r, AUX1 … AUX6): Here you set which outputs are switched

s with the function.
4 CVs for the special functions: Here you set separately for each driving direction with

which function the special functions are activated / deactivated.
Switch-off function: Here you can define a function with which you can switch off the
m actions assigned to the function when switching on. The value “255” determines that the
actions are switched off with no function.
t a Use of contacts 4 and 13

Depending on the setting in CV 121 (configuration variable 2), contacts 4 and 13 are used

either as (unamplified) outputs AUX3 and AUX4

or as connections for the train bus (e.g. SUSI CLOCK and SUSI DATA).

The settings for AUX3 and AUX4 are only effective if use as outputs is set for the two contacts in CV 121. If the contacts are set to be used for the train bus (e.g. SUSI), the CV settings for the AUX3 and AUX4 outputs are ineffective. They have no influence on the data transmission in the train bus.

Configuration variables and registers | 27

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Outputs

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not Special functions
in use

off/on with function

F0f F0r AUX1 AUX2 AUX3 AUX4 AUX5 AUX6 ABD

Values 1 2 4 8 16 32 64 128 0

Input

0, 1, 2, 3, 4,…, 255

values

8 (off) 0, 8

F0, F1, F2, …, F28, —
0, 1, 2, … 28, 255

not

off/on with

Outputs

Special functions

CV name
F0 f F0 r F1 f F1 r F2 f F2 r F3 f

CVNo.
257 261 265 269 273 277 281

Default
ik value
(1) F0f during forward travel
n (2) F0r during backward travel o (4) AUX1 during forward travel t r (4) AUX1 during backward travel k (8) AUX2 during forward travel le (8) AUX2 during backward travel e (0)

in use CV- CVNo. No. 258 259 262 263 266 267 270 271 274 275 278 279 282 283

Default value
(0) (0) (0) (0) (0) (0) (0)

function
CV- Default No. value
260 (255) 264 (255) 268 (255) 272 (255) 276 (255) 280 (255) 284 (255)

F3 r 285 (0) F4 f 289 (0)

286 287 290 291

(0) (8) ABD

288 (255) 292 (255)

F4 r F5 f F5 r

293 297 301

(0)
m (16) AUX3 during forward travel t a (16) AUX3 during backward travel

294 295 298 299 302 303

(8) ABD (0) (0)

296 (255) 300 (255) 304 (255)

F6 f 305 (32) AUX4 during forward travel

306 307

(0)

308 (255)

F6 r 309 (32) AUX4 during backward travel

310 311

(0)

312 (255)

F7 f 313 (64) AUX5 during forward travel

314 315

(0)

316 (255)

F7 r 317 (64) AUX5 during backward travel

318 319

(0)

320 (255)

F8 f 321 (128) AUX6 during forward travel

322 323

(0)

324 (255)

F8 r 325 (128) AUX6 during backward travel

326 327

(0)

328 (255)

F9 f 329 (0)

330 331

(0)

332 (255)

F9 r 333 (0)

334 335

(0)

336 (255)

28 | Configuration variables and registers

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Outputs

FD-Next18

not Special functions
in use

off/on with function

F0f F0r AUX1 AUX2 AUX3 AUX4 AUX5 AUX6 ABD

Values 1 2 4 8 16 32 64 128 0

Input

0, 1, 2, 3, 4,…, 255

values

8 (off) 0, 8

F0, F1, F2, …, F28, —
0, 1, 2, … 28, 255

CV name
F10 f F10 r F11 f F11 r F12f F12 r F13 f F13 r F14 f F14 r F15 f F15 r F16 f

Outputs

CV- Default No. value

337 (0)

341 (0)

345 (0)

349 (0)

353 (0)

357 (0)

361 (0)

365 (0) 369 (0)

373 (0)
m 377 (0)
381 (0)
t a 385 (0)

not

Special functions in use

CV- CV-
ik No. No.

Default value

338 339

(0)

n 342 343

(0)

o 346 347

(0)

t r350 351

(0)

k354 355

(0)

le 358 359

(0)

e 362 363

(0)

366 367

(0)

off/on with function
CV- Default No. value
340 (255) 344 (255) 348 (255) 352 (255) 356 (255) 360 (255) 364 (255) 368 (255)

370 371

(0)

372 (255)

374 375

(0)

376 (255)

378 379

(0)

380 (255)

382 383

(0)

384 (255)

386 387

(0)

388 (255)

F16 r 389 (0)

390 391

(0)

392 (255)

F17 f 393 (0)

394 395

(0)

396 (255)

F17 r 397 (0)

398 399

(0)

400 (255)

F18 f 401 (0)

402 403

(0)

404 (255)

F18 r 405 (0)

406 407

(0)

408 (255)

F19 f 409 (0)

410 411

(0)

412 (255)

F19 r 413 (0)

414 415

(0)

416 (255)

Configuration variables and registers | 29

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Outputs

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not Special functions
in use

off/on with function

F0f F0r AUX1 AUX2 AUX3 AUX4 AUX5 AUX6 ABD

Values 1 2 4 8 16 32 64 128 0

Input

0, 1, 2, 3, 4,…, 255

values

8 (off) 0, 8

F0, F1, F2, …, F28, —
0, 1, 2, … 28, 255

CV name
F20 f F20 r F21 f F21 r F22f F22 r F23 f F23 r F24 f F24 r F25 f F25 r F26 f

Outputs

CV- Default No. value

417 (0)

421 (0)

425 (0)

429 (0)

433 (0)

437 (0)

441 (0)

445 (0) 449 (0) 453 (0) 457 (0) 461 (0) 465 (0)

s tam

not

off/on with

Special functions in use

CV- CV-
ik No. No.

Default value

418 419

(0)

n 422 423

(0)

o 426 427

(0)

t r 430 431

(0)

k434 435

(0)

le438 439

(0)

e 442 443

(0)

function

CV- Default

No.

value

420 (255)

424 (255)

428 (255)

432 (255)

436 (255)

440 (255)

444 (255)

446 447

(0)

448 (255)

450 451

(0)

452 (255)

454 455

(0)

456 (255)

458 459

(0)

460 (255)

462 463

(0)

464 (255)

466 467

(0)

468 (255)

F26 r 469 (0)

470 471

(0)

472 (255)

F27 f 473 (0)

474 475

(0)

476 (255)

F27 r 477 (0)

478 479

(0)

480 (255)

F28 f 481 (0)

482 483

(0)

484 (255)

F28 r 485 (0)

486 487

(0)

488 (255)

30 | Configuration variables and registers

tams elektronik Example: Programming for shunting operation

FD-Next18

Hint: The connection of the return conductor is not shown.

nik F0f

o Values

Outputs

F0r

AUX1

AUX2 8

off/on with function F0 F1 F2 F3 F4 … F28 –0 1 2 3 4 … 28 255

t r CV CV-No. name

k F0 f

257

le F0 r

261

e F3 f

281

s F3 r

285

Set value
5 (outputs F0f and AUX1) 10 (outputs F0r and AUX2) 12 (outputs AUX1 and AUX2) 12 (outputs AUX1 and AUX2)

CV-No. Set value
260 3 (= F3 / shunting operation) 264 3 (= F3 / shunting operation) 284 255 (= no F assigned) 288 255 (= no F assigned)

With this programming you achieve the following effects when switching on the shunting mode (here with function F3):
m The three-light head signals (AUX1 and AUX2), which in normal operation are switched with a F0 depending on the direction of travel, are switched off. t The end-of-train signals (F0f and F0r), which in normal operation are switched with F0
depending on the direction of travel, are switched off.

The three-light head signals (AUX1 and AUX2) on both sides are switched on (shunting

lighting).

Configuration variables and registers | 31

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Example: Programming for rear end signal “off” with coupled carriages

Hint: The connection of the return conductor is not shown.

nik F0f

o Values

Outputs

F0r

AUX1

AUX2 8

off/on with function F0 F1 F2 F3 F4 … F28 –0 1 2 3 4 … 28 255

t r CV k name

CV-No.

Set value

le F0 f

257 5 (outputs F0f and AUX1)

e F0 r

261 10 (outputs F0r and AUX2)

s F3 f

281 4 (output AUX1)

CV-No. Set value

260

5 (= F5 / operation with attached wagons)

264

5 (= F5 / operation with attached wagons)

284 255 (= no F assigned)

F3 r

285 2 ( output F0r)

288 255 (= no F assigned)

m With this programming you achieve the following effects when switching on the operation t a with attached wagons (here with function F5):

The three-light head signals (AUX1 and AUX2), which in normal operation are switched

with F0 depending on the direction of travel, are switched off.

The end-of-train signals (F0f and F0r), which in normal operation are switched with F0
depending on the direction of travel, are switched off.

The three-light head signal (AUX1) is switched on when the direction of travel is “forward”.

The end-of-train signal (F0r) is switched on when the direction of travel is “backwards”.

32 | Configuration variables and registers

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5.6. Effects of the outputs

Dimming of the outputs (only F0f, F0r, AUX1 and AUX2)

Output
F0f F0r AUX1 AUX2

No. Input values (Default)

1…64 (64)

Remarks and tips
= Reduction of the voltage applied to the output 1 = lowest voltage 255 = maximum voltage

Assignment of the effects to the outputs

ik Output

No. Input values (Default)

F0f

0 … 255 (0)

n F0r o AUX1

0 … 255 (0)

r AUX2

0 … 255 (0)

t AUX3

0 … 255 (0)

k AUX4

0 … 255 (0)

le AUX5

0 … 255 (0)

e AUX6

0 … 255 (0)

Remarks and tips

no effects

Invert function

Flashing on

Kicking on (from software version 1.1) 4

Successive dimming up and down off 8 (only F0f, F0r, AUX1 and AUX2)

Fire simulation on

(only F0f, F0r, AUX1 and AUX2)

Output on/off at the voltage defined in CV 63

Example: Alternating flashing with AUX1 and AUX2: Input value for AUX1: CV 57 = 2 | Input value for AUX2: CV 58 = 3 (1 + 2)

m Flashing frequency

t a Output

No.

Input values

Remarks and tips

(Default)

F0f / F0r AUX1 / AUX 2

101 1 … 255 (20) 102 1 … 255 (20)

1 = highest flashing frequency 255 = lowest flashing frequency

AUX3 / AUX4

103 1 … 255 (20)

Setting common for 2 outputs

AUX5 / AUX6

104 1 … 255 (20)

Note: The flashing function must be switched on for the output. (CV 55 – 62)

Configuration variables and registers | 33

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Dimming up and down the outputs

Name

No. Input values (Default)

Time for dimming 100 up and down
Setting common for all outputs

1…255 (10)

Remarks and tips
= Time until the maximum voltage is reached or the voltage is reduced to “0”. 1 = shortest possible time 255 = longest possible time Note: For the output, dimming up and down must be switched on. CV 55 – 58

Settings for MARs-Light (only F0f, F0r, AUX1 and AUX2) The warning light typical for American locomotives is generated when the CV values are set as
ik follows:

n Output

No. Input values (Default)

Remarks and tips

o F0f

0 … 255 (0)

Flashing on

r F0r

0 … 255 (0)

t AUX1

0 … 255 (0)

k AUX2

0 … 255 (0)

le F0f / F0r

101 1 … 255 (20)

Flashing frequency

e AUX1 / AUX2

102 1 … 255 (20)

Setting common for 2 outputs

F0f / F0r AUX1 / AUX”

100

s1…255 (10)

Time for dimming up and down

Note: For the output, dimming up and down

m Voltage for switching outputs on/off

t a Name

No. Input values

(Default)

must be switched on. CV 55 – 62 Remarks and tips

Voltage for

“output on/off”

Setting common for all outputs

0 … 255 (16)

0 = lowest voltage
255 = highest voltage The setting only applies to the outputs for which switching on/off has been activated when the voltage set here is reached. CV 55 … 62

By default, the output is switched off when the voltage is exceeded and switched on again when the voltage falls below it. The function can be reversed by inverting the function. ( CV 55…62)

34 | Configuration variables and registers

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Kick time

Name

No. Input values (Default)

Remarks and tips

Kicking time

(“moment-

function”)

Setting common for all outputs

0 … 255 (32)

0 = shortest kick time
255 = longest kick time (= 25.5 seconds)
Increasing the input value by “1” extends the time period by 0.1 sec.

Note: The kick function must be activated for the output. (CV 55 – 62)
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Configuration variables and registers | 35

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5.7. RailCom and DCC-A settings

Name

No. Input values (Default)

Remarks and tips

Dynamic

0,1 (0)

off

RailCom information

Reception statistics:
The decoder keeps statistics on all DCC packets and reports the

number of faulty packets /

total number of packets in %.

In order to read out RailCom information, you have to make the following additional settings:
CV 29 “Configuration data 1”: RailCom on
ik CV 28 “RailCom channels”: at least channel 2 on

n RailCom channels 28 o Automatic r registration t according to RCNs elek 218 (DCC-A)

0 … 135 (131)

no feedback with RailCom and no

automatic registration

Channel 1 on

Channel 2 on

Recommendation: Always switch on channel 2

when you have switched on channel 1.

Use of Dynamic channel 1

The setting only has an effect if

channel 1 is switched on.

Automatic registration

according to RCN-218 (DCC-A)

128

m Notes on automatic registration according to RCN-218 (DCC-A):
The use of the DCC-A procedure is only possible with digital control units that support this registration
t a procedure. To be able to use the automatic login via the DCC-A procedure, the following settings must be

made:

CV 29 “Configuration data 1”: RailCom on

CV 28 “RailCom channels”: channel 1 and 2 on

CV 28 “DCC-A”: on

The activation of the Dynamic Channel 1 is optional.

Notes on the use of Dynamic Channel 1: Some RailCom detectors can only receive address messages on channel 1. If these detectors are used, the application of Dynamic Channel 1 must not be activated.

Further information on RailCom and automatic registration according to RCN-218 (DCC-A) section 2.6.

36 | Configuration variables and registers

tams elektronik

FD-Next18

5.8. Settings for driving operation

Setting the Packet Time Out

Name

No. Input values Remarks and tips (Default)

Packet Time Out 11

2 … 255 (16)

Time period between the failure of the digital signal and the change to the alternative operation (analogue operation).

Increasing the input value by “1” extends the time period by 10 ms.

Notes:
If automatic analogue recognition is active, the decoder will automatically switch to analogue mode if it does not receive a digital signal during the set time.
ik If the decoder is supplied via a buffer circuit,
– the automatic analogue recognition in CV 29 should be deactivated and
n – a low value for the Packet Time Out should be set (approx. 16).
This prevents the locomotive from continuing to run unplanned after the track voltage has been switched
o off (e.g. during an emergency stop or a signal stop). t r Consist operation k As a standard, in multiple units (consist operation) you can only control velocity and direction.
In CV 21 and 22 you can define additional functions to be switched when using the address for
le multiple units defined in CV 19. If the value “0” is set, the function will continue to be e addressed only via the address set for the vehicle concerned in CV 1 or CV 17 and 18.

Name

No.

sInput values
(Default)

Remarks and tips

Functions active in 21 consist operation
t am (F1 to F8)

0 … 255 (0)

F1 on F2 on F3 on F4 on

1 2 4 8

F5 on

F6 on

F7 on

F8 on

128

Functions active in 22

0 … 63 (0)

F0f on

consist

F0r on

operation

F9 on

(F0, F9 to F12)

F10 on

F11 on

F12 on

Configuration variables and registers | 37

FD-Next18

tams elektronik

Use of the ABC braking method

Name

No. Input values (Default)

Remarks and tips

ABC sensitivity

122 0 … 255 (10)

= Level of asymmetry of the track voltage, which the decoder interprets as entering an ABC braking section. 0 = highest sensitivity 255 = lowest sensitivity

Notes:

The settings for the ABC sensitivity are only required if the decoder is used together with a locomotive

decoder in a train set for which shuttle operation based on the ABC braking method is activated. Adopt the input values from the CVs of the locomotive decoder in the train set.

ik 5.9. Settings for analogue mode

n Name r o Functions t active in k analogue
mode
ele (F1 to F8)

No. Input values (Default)

0 … 255

(0)

Remarks and tips
F1 on F2 on F3 on F4 on F5 on

1 2 4 8 16

s F6 on

Functions active in

m 14

0 … 31

t a(0)

F7 on F8 on F0 on F9 on

64 128
1 2

analogue

mode

F10 on

(F0, F9 to F12)

F11 on

F12 on

38 | Configuration variables and registers

tams elektronik

FD-Next18

5.10. Auxiliary functions

Name

No. Input values (Default)

Remarks and tips

Reset

0 … 255

Any input value restores the settings in state of delivery.

Decoder lock

0 … 255 (3)

Changing the CV values of the decoder is only possible if the values in CV 15 and 16 are identical.

By assigning specific values in CV 16 the CVs of decoders with the same address can be changed separately. Application e.g. for vehicles or train formations with several decoders with the same address (e.g. locomotive, sound, function decoders).
ik Note: In case of a reset, the setting in CV 16 is retained and is not reset to the factory settings.

n Index for

0 (0)

Adjustable in DCC format only!

higher

Function mapping

o CV-Pages

0 (42)

Adjustable in DCC format only!

rFunction mapping

t Note: If different values are entered in CV 31 and/or 32, it is not possible to use the function mapping. k The settings for the function outputs and the special functions cannot be changed then.

ele 5.11. Information

Name

No.

sInput values
(Default)

Remarks and tips

Version

m Manufacturer

t a Permitted modes 12

—– (62) — (53)

of operation

Readable in DCC format only!
Readable in DCC format only!
Defines the permitted modes of operation for the decoder

Readable in DCC format only!

53 = 1 + 4 + 16 + 32 1 = DC | 4 = DCC | 16 = AC | 32 = MM

Method for function assignment
Readable in DCC format only!

— (2)

Defines the method for assigning the functions:
2 = Function assignment via CVs 257 to 512 in the bank selected by CV 31 = 0 and CV 32 = 42 with CVs per function according to RailCommunity standard RCN-227 section 2

Configuration variables and registers | 39

FD-Next18

tams elektronik

6. Checklist for troubleshooting and error correction
! Warning: If you notice a strong heat development or if the decoder starts to smoke, disconnect the connection to the supply voltage immediately. Fire hazard!
Possible causes:
Possible cause: one or more connections are soldered incorrectly. à Check the
connections.
Possible cause: Short circuit between the decoder or accessories connected to the retrun
conductor for all functions and metal parts of the locomotive or the rails. à Check the connections. A short circuit can result in irreparable damage.
ik 6.1. Problems with programming the decoder
The CV values cannot be changed.
n Possible cause: o Different values are entered in CV 15 and CV 16 (decoder lock). à Enter the same value in r CV 15 as in CV 16. t 6.2. Problems in driving mode k After programming the decoder, the functions are not switched. le Possible causes: e In CV 1 a base address > 127 is on and in CV 29 the use of extended addresses is off. In s this case the decoder does not react to DCC commands. à Enter a base address < 127 in
CV 1 or activate the use of extended addresses in CV 29.
In CV 29 the use of extended addresses is set. In this case the decoder does not react to
Motorola commands. à Deactivate the use of extended addresses in CV 29.
m The entered values for the CV variables are inconsistent. à Perform a decoder reset and t a set the values again.

40 | Checklist for troubleshooting and error correction

tams elektronik

FD-Next18

6.3. Problems with the feedback of the decoder
The CV values cannot be read out via RailCom. Possible cause:
RailCom is switched off. à Change the value for CV 29 (add “8” to the input value).
The decoder does not register with the control unit via DCC-A. Possible causes:
RailCom is switched off. à Change the input value in CV 29 (add “8” to the input value). DCC-A is switched off. à Change the input value for CV 28. There are one or more decoders on the layout which (wrongly) react to the DCC-A
command for registration. à In this case carry out the registration from a separate track (e.g. from the programming track).
ik 6.4. Problems when switching functions n An additional device / lighting does not react to switching commands. o Possible cause: r The assignment of the functions to the output to which the device / lighting is connected is t different than intended. à Check the settings in the Function Mapping. k The accessory is defective or incorrectly connected. à Check the accessory and the
connection.
le The output is defective (e.g. due to overload or a short circuit). à Send in the decoder for e checking / (chargeable) repair. s The light goes on and off when switching up the speed levels or the light cannot be
switched on or off. Possible cause:
m The DCC speed mode of the decoder and the digital control unit do not match. Example: The control unit is in 28 speed level mode, but the decoder is in 14 speed level mode. t a à Change the speed mode on the control unit and / or on the decoder. Additional devices on AUX3 and AUX4 do not respond to switching commands. Lights connected to AUX3 and AUX4 flicker constantly. Possible cause:
In CV 121, the use for the data bus (e.g. SUSI) is set for contacts 4 and 13. à Change the
setting for CV 121.
The SUSI module in the locomotive does not react to switching commands. Possible cause:
In CV 121, the use as outputs is set for contacts 4 and 13. à Change the setting for
CV 121.

Checklist for troubleshooting and error correction | 41

FD-Next18

tams elektronik

In a shuttle section based on the ABC braking method, the outputs dependent on the direction of travel are not switched correctly.
Possible cause:
In CV 121, the ABC braking method and/or the shuttle mode is deactivated. à Change the
setting for CV 121.
Outputs that are to be switched on or off at the voltage defined in CV 63 are switched before or after the voltage (speed level) is actually reached.
Possible cause:
The settings for the motor characteristic curve in CV 2, 3, 4, 5, 6, 29 and/or 67…94 differ
from the settings for the locomotive decoder in the train set. à Accept the setting values of the locomotive decoder for the FD-Next18.
The settings for the constant braking distance in 121 differ from the settings for the
ik locomotive decoder in the train set. à Accept the setting values of the locomotive
decoder for the FD-Next18.
n 6.5. Problems in analogue mode o The locomotive does not run in analogue mode, the decoder does not react. r Possible cause: t Analogue mode is switched off. à Change the value for CV 29. k The decoder does not switch to analogue mode le (or switches over although it is still controlled digitally). e Possible cause: s In CV 11 the value for the Packet Time-Out is set too high or too low.. à Change the value
and check the setting during operation.
tam

42 | Checklist for troubleshooting and error correction

tams elektronik

FD-Next18

6.6. Technical Hotline
If you have any questions about the use of the decoder, our technical hotline will help you (telephone number and e-mail address on the last page).
6.7. Repairs
You can send us a decoder for inspection / repair (address on the last page). Please do not send us your return freight collect. In the event of a warranty or guarantee claim, we will reimburse you for the regular shipping costs.
Please enclose the following with your shipment
proof of purchase as evidence of any warranty or guarantee claim a brief description of the defect
ik the address to which we should return the product(s)
your email address and/or a telephone number where we can reach you in case of queries.
n Costs o The inspection of returned products is free of charge for you. In the event of a warranty or r guarantee claim, the repair and return are also free of charge for you. t If there is no warranty or guarantee case, we will charge you the costs of the repair and the
costs of the return. We charge a maximum of 50% of the new price for the repair according to
k our valid price list. le Carrying out the repair(s) e By sending in the product(s), you give us the order to inspect and repair it. We reserve the s right to refuse the repair if it is technically impossible or uneconomical. In the event of a
warranty or guarantee claim, you will then receive a replacement free of charge.
Cost estimates Repairs for which we charge less than 25.00 per item plus shipping costs will be carried out
m without further consultation with you. If the repair costs are higher, we will contact you and t a carry out the repair only after you have confirmed the repair order.

Checklist for troubleshooting and error correction | 43

FD-Next18

tams elektronik

7. Technical data

Digital protocols

Data formats

Motorola II DCC (according to NMRA and RCN-standard)

Formats for the automatic registration of vehicle decoders

DCC-A according to RCN-218 (can be switched off)

Feedback format

RailCom according to RCN-211 (can be switched off)

Interfaces, outputs and inputs

ik Decoder interface

Next18 according to RCN-118

Number of switching inputs —

elekt ron Number of switching outputs

according to RCN-118:
4 amplified function outputs (F0f, F0f, AUX1 and AUX2) 2 unamplified outputs (AUX5 and AUX6)
depending on the configuration: 2 unamplified outputs (AUX3 and AUX4) or 2 connections for the train bus, e.g. “DATA” and “CLOCK” of the SUSI interface

Connection for backup capacitor or buffer circuit

s 1

Connection for control line of –buffer circuit
t am Electrical properties

Power supply

12-20 volts digital voltage or

analogue driving transformer (direct voltage)

Current consumption (without consumers)

maximum 20 mA

Maximum total current

1,000 mA

Maximum current per output

amplified function outputs (F0f, F0f, AUX1 and AUX2): 100 mA unamplified function outputs (AUX3, AUX4, AUX5, AUX6): 0.5 mA

44 | Technical data

tams elektronik

FD-Next18

Protection Protection class
Overload protection

IP 00 Meaning: No protection against solid foreign bodies. No protection against water.
—

Environment

For use in closed rooms

Ambient temperature during operation
Permissible relative humidity during operation
Ambient temperature during storage
Permissible relative humidity during storage
Other features

0 ~ + 60 °C
nik 10 ~ 85% (non-condensing) r o – 10 ~ + 80 °C elekt 10 ~ 85% (non-condensing)

Dimensions

s15 x 9.5 x 2.9 mm according to RCN-118

Weights

t am approx. 0.6 g

Technical data | 45

FD-Next18

tams elektronik

8. Warranty, EU conformity & WEEE
8.1. Guarantee bond
For this product we issue voluntarily a guarantee of 2 years from the date of purchase by the first customer, but in maximum 3 years after the end of series production. The first customer is the consumer first purchasing the product from us, a dealer or another natural or juristic person reselling or mounting the product on the basis of self-employment. The guarantee exists supplementary to the legal warranty of merchantability due to the consumer by the seller. The warranty includes the free correction of faults which can be proved to be due to material failure or factory flaw. With kits we guarantee the completeness and quality of the components as well as the function of the parts according to the parameters in not mounted state. We guarantee the adherence to the technical specifications when the kit has been
ik assembled and the ready-built circuit connected according to the manual and when start and
mode of operation follow the instructions.
n We retain the right to repair, make improvements, to deliver spares or to return the purchase
price. Other claims are excluded. Claims for secondary damages or product liability consist
o only according to legal requirements. r Condition for this guarantee to be valid, is the adherence to the manual. In addition, the t guarantee claim is excluded in the following cases: k if arbitrary changes in the circuit are made, le if repair attempts have failed with a ready-made module or device,
if damaged by other persons,
e if damaged by faulty operation or by careless use or abuse. s
tam

46 | Warranty, EU conformity & WEEE

tams elektronik

FD-Next18

8.2. EU Declaration of Conformity
This product fulfils the requirements of the following EU directives and therefore bears the CE marking.
2001/95/EU Product Safety Directive 2015/863/EU on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS) 2014/30/EU on electromagnetic compatibility (EMC Directive). Underlying standards: DIN-EN 55014-1 and 55014-2: Electromagnetic compatibility – Requirements for household appliances, electric tools and similar electrical appliances. Part 1: Emitted interference, Part 2: Immunity to interference
To maintain electromagnetic compatibility during operation, observe the following measures:
ik Only connect the supply transformer to a professionally installed and fused earthed socket.
Do not make any changes to the original components and follow the instructions, connection
n and assembly diagrams in this manual exactly.
Only use original spare parts for repair work.
t r o 8.3. Declarations on the WEEE Directive
This product is subject to the requirements of the EU Directive 2012/19/EC on Waste Electrical
k and Electronic Equipment (WEEE), i.e. the manufacturer, distributor or seller of the product le must contribute to the proper disposal and treatment of waste equipment in accordance with
EU and national law. This obligation includes
e registration with the registering authorities (“registers”) in the country where WEEE is s distributed or sold
the regular reporting of the amount of EEE sold the organisation or financing of collection, treatment, recycling and recovery of the
products
m for distributors, the establishment of a take-back service where customers can return WEEE a free of charge t for producers, compliance with the Restriction of the Use of Certain Hazardous Substances
in Electrical and Electronic Equipment (RoHS) Directive.
The “crossed-out wheeled bin” symbol means that you are legally obliged to recycle the marked equipment at the end of its life. The appliances must not be disposed of with (unsorted) household waste or packaging waste. Dispose of the appliances at special collection and return points, e.g. at recycling centres or at dealers who offer a corresponding take-back service.

Warranty, EU conformity & WEEE | 47

lekt ronik Further Information and Tips: e http://www.tams-online.de
s m Warranty and Service: t a tams elektronik GmbH
Fuhrberger Str. 4 30625 Hannover / GERMANY
Phone: +49 (0)511 / 55 60 60 Fax: +49 (0)511 / 55 61 61
Email: support@tams-online.de

Documents / Resources

TAMS Elektronik FD-Next18 Function Decoder [pdf] Owner's Manual
FD-Next18 Function Decoder, FD-Next18, Function Decoder, Decoder

References

User Manual

TAMS Elektronik FD-Next18 Function Decoder Owner’s Manual

FD-Next18 Function Decoder

Product Information

Specifications

Product Usage Instructions

1. Digital Operation

2. Analogue Mode

3. Automated Processes

4. Outputs and Interfaces

5. Programming

6. Configuration Settings

Frequently Asked Questions (FAQ)

Q: Can the FD-Next18 be used with other types of
interfaces?

Q: How can I avoid irreparable damage to the decoder?

Q: Is it possible to connect a backup capacitor or buffer
circuit to the FD-Next18?

Documents / Resources

References

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