Daikin LonWorks Communication Module IM 918-6

Installation and Maintenance Manual

Part Number: IM 918-6

Group: Controls

Date: July 2025

Applies to Daikin Applied Packaged Rooftops, Applied Rooftop, and Self-Contained Systems.

Models: DPH, DPS, DPSA/DFSA, MPS, RAH, RCE, RCS, RDE, RDS, RDT, RFS, RPE, RPS, SWP and SWT.

Introduction

This manual provides instructions for installing or replacing the LonWorks® communication module used on MicroTech® III and MicroTech 4 unit controller applications. It applies to Daikin Applied® Packaged Rooftops, Rebel® Rooftops, and Self-Contained models: DPH, DPS, DPSA/DFSA, MPS, RAH, RCE, RCS, RDE, RDS, RDT, RFS, RPE, RPS, SWP and SWT.

The manual describes how to set up the unit controller for network communication and troubleshoot common network issues.

This document is intended for service technicians or other qualified personnel familiar with standard BACnet concepts and terminology. For technical support, contact the Daikin Applied Controls Support Group at 866-462-7829.

Hazardous Information Messages

DANGER: Danger indicates a hazardous situation, which will result in death or serious injury if not avoided.
WARNING: Warning indicates a potentially hazardous situations, which can result in property damage, personal injury, or death if not avoided.
CAUTION: Caution indicates a potentially hazardous situations, which can result in minor injury or equipment damage if not avoided.
NOTICE: Notice indicates practices not related to physical injury.

Reference Documents

Number	Company	Title	Source
078-0156-01G	Echelon® Corporation	LonWorks FTT-10A Free Topology Transceiver Users Guide	www.echelon.com
078-0120-01E	LONMARK Interoperability Association	LONMARK Application Layer Interoperability Guidelines, Version 3.4	www.lonmark.org
078-0014-01E	LONMARK® Interoperability Association	LONMARK Layers 1-6 Interoperability Guidelines, Version 3.4	www.lonmark.org
8500_20	LONMARK Interoperability Association	Space Comfort Controller Functional Profile
8610_10	LONMARK Interoperability Association	Discharge Air Controller Functional Profile
OM 1288	Daikin Applied	MicroTech 4 Unit Controller Operation Manual	www.DaikinApplied.com
OM 920	Daikin Applied	MicroTech Unit Controller Operation Manual for Applied Rooftop and Self-Contained Systems
ED 19117	Daikin Applied	MicroTech 4 Unit Controller Network Integration Guide, BACnet and LONWORKS Networks
ED 15112	Daikin Applied	MicroTech Rooftop and Self Contained Unit Controller Network Integration Guide, BACnet and LONWORKS Networks

Product Information

Description

The LonWorks communication module is a printed circuit board within a plastic enclosure. It connects directly to the left side of the unit controller. The software application translates Standard Network Variable Types (SNVTs) and Standard Network Configuration Parameter Types (SCPTs) supported by the unit controller into network variables and parameters used by the LonWorks network.

Application

A LonWorks communication module connects the unit controller to the building automation system (BAS) on a LonWorks network. It enables the exchange of variables between the unit controller and the network. The module is LonMark® 3.4 certified with conformance to the LonMark SCC or DAC functional profile. Profiles are interpreted in the firmware. Refer to MicroTech 4 Rebel Applied Unit Controller Operation Manual (OM 1288) or MicroTech Applied Air Handling Unit Controller Operation Manual (OM 920) for unit controller display menu options for network variables.

Physical Dimensions

The module's physical dimensions are approximately 1.77 x 4.33 x 2.95 inches (45 x 110 x 75 mm). Figure 1 shows the top view, and Figure 2 shows the side view, illustrating the module's compact design.

Specifications

General
Dimensions	W x H x D: 1.77 x 4.33 x 2.95 in (45 x 110 x 75 mm)
Weight	3.0 oz (85 g)
Material	Base - plastic, pigeon-blue; Housing - plastic, light-gray
Operating Temperature	-40 - 158°F (-40 - 70°C)
Humidity	<90% RH
Atmospheric pressure	Min. 10 psi (70kPa), corresponding to max. 9,842 ft (3,000 m) above sea level

Storage and Transportation
Temperature	-40 - 158°F (-40 - 70°C)
Humidity	<95% RH
Atmospheric pressure	Min. 3.77 psi (26 kPa), corresponding to max. 32,808 ft (10,000 m) above sea level

Electrical
Power	Supplied via unit controller DC 5 V (+5%/-5%), max. 80 mA
Network cable	LON interface: Plug-in terminals 2 wires, interchangeable
Bus connection/ Transceiver	Galvanically isolated, 78k baud TP/FT-10 transceiver; Connection to Bus via the T1 port; Terminal plug: 2-pin spring cage top entry
LonWorks data memory	56 kbyte flash memory for the user application

Additional Components
Board-to-board connector	10-pin plug between module and unit controller

Agency Listings
US	UL916, UL873
Canada	CSA C22.2M205
Europe EMC directive	2004/108/EC
Low-voltage directive	2006/95/EC
RoHS directive	2002/95/EC

Component Data

The LonWorks communication module is a printed circuit board in a plastic enclosure, connecting to the left side of the unit controller. It may attach to an existing module if multiple modules are present.

Service Pin

The service pin generates a service-pin message containing the Neuron® ID and program code for commissioning. It is activated by inserting a small tool into the button located below the enclosure, left of the LEDs. See Commissioning section for details.

Light Emitting Diodes (LEDs)

The module has two LEDs indicating communication activity and network status.

BSP LED

BSP LED Color	Meaning
Flashing between Red and Yellow	Fail safe mode. Download LON BSP again. This normally happens after downloading BSP 9.26 or later. For later versions of BSP, two downloads are required. After the first download, the card enters this fail safe mode.
Flashing between Red and Green	Board Support Package (BSP) upgrade in progress
Green	Communication is established between the communication module and the unit controller.
Yellow	The communication module is capable of communicating to the unit controller. However, communication is not established.
Red flashing with 2Hz	Software error¹
Red	Hardware error¹

¹In the event that this should occur, cycle power to the unit controller to attempt to clear the problem. Contact the Controls Customer Support Group at 866-462-7829 for additional assistance if necessary.

BUS LED

BUS LED Color	Description
Green	The unit controller is capable of communicating to the network.
Yellow	The communication module is initializing.
Yellow flashing	The unit controller has not yet communicated with the network.
Red	Hardware error.

LonWorks Network Connector

The physical connection to the LonWorks network bus uses pins CLA (FTT-10A) and CLB (FTT-10B).

Board-To-Board Connector

A 10-pin connector links the unit controller to the LonWorks communication module.

Neuron ID

The module uses an Echelon Neuron integrated circuit with a unique 48-bit Neuron ID, used for initial installation or diagnostics. Normal operation uses a device address.

Transceiver

Equipped with an Echelon Free Topology Transceiver (FTT-10A) supporting free topology networks (ring, star, daisy-chain) via twisted pair cable. Data transmission rate is 78 kbps (baud).

Bus Termination

Bus termination resistors are crucial for proper network performance. Free topology requires one 52.3 Ω terminator at the busiest point. Line topology requires two 105 Ω terminators at each end.

Component	Value
Network topology	Flexible Free Topology
Neuron chip processor	3150
Transceiver (FTT-10A)	50051
Cable types	TIA Category 5 (recommended)
Max cable length	1476 ft (450 m) per segment (total of all lines)
Max node separation	820 ft (250 m)
Data transmission	Two-wire, half duplex
Data transmission rate	78 kbps (baud)
Bus terminator	Free topology: use one (1) 52.3 Ω bus terminator at the busiest point of the network. Daisy chain or standard line (dual) topology: use two (2) 105 Ω bus terminators at the end of both network segments.
Repeaters and routers	Typically used when cable length exceeds limits. May not be used in ring topology. Must be placed before the network's ring port.

Installation and Mounting

This section details field installation or replacement of the LonWorks communication module on the unit controller.

CAUTION: Electrostatic discharge hazard. Handle with care to prevent equipment damage.

WARNING: Electric shock hazard. Ensure proper grounding. Only qualified personnel should perform connections.

Field Installation Kit

The LonWorks communication module
Board-to-board connector

Installing a new Communication Module

Follow these steps to install the module:

Set "Control Mode = Off" on the unit controller display.
Remove power from the unit controller.
Carefully remove the blue plastic knockout strip from the far left end of the unit controller (or existing module).
Carefully remove the blue plastic knockout strip from the right side of the LonWorks communication module.
Insert the board-to-board connector into the LonWorks communication module, ensuring baffles align with slots.
Insert the other end of the board-to-board connector into the unit controller's left side or an adjacent module.
Connect the LonWorks communication module to the network via the network connector.
Apply power to the unit controller. The unit will reset automatically in approximately 30 seconds.

Replacing a Communication Module

Follow these steps to replace an existing module:

Set "Control Mode = Off" on the unit controller display.
Remove power from the unit controller.
Locate the LonWorks communication module to the left of the unit controller.
Gently disconnect the network cable connector.
Grasp and gently pull the LonWorks communication module from the unit controller or adjacent module.
Install the new LonWorks communication module:
- Carefully remove the blue plastic knockout strip from the right side of the new module.
- Insert the board-to-board connector into the new module, ensuring baffles align.
Insert the network cable connector into the new module.
Apply power to the unit controller. The unit will reset automatically in approximately 30 seconds.

Commissioning and Configuration

LonWorks Network Addressing

After installation, the module is ready for BAS integration. This involves connecting the unit to the network, addressing, and configuring it. The module uses an FTT-10A transceiver for free topology network wiring. Network addresses consist of Domain ID, Subnet ID, and Node ID. Groups and broadcast addresses are also used.

External Interface File (XIF) and NXE Files

LonMark guidelines require XIF files for configuration. NXE files contain the application image. Both are available at www.DaikinApplied.com or www.lonmark.org.

Resource Files

Resource files define functional profiles and variables, available at www.DaikinApplied.com or www.lonmark.org.

Commissioning

Verify the communication module is attached properly.
Connect the twisted pair cable to the network connector pins CLA and CLB.
Download XIF, NXE, and Resource Files from www.DaikinApplied.com or www.lonmark.org.
Use a LonWorks network configuration tool (e.g., LonMaker) to map the Neuron ID to the logical addressing scheme.
Confirm the BAS is ready to receive a network device broadcast message.
Press the service pin button using a small tool. The initialization process begins. Both BSP and BUS LEDs should turn steady green upon successful communication.

NOTE: Cycle power after commissioning, de-commissioning, or re-commissioning a device.

Configuration

Parameters can be configured via the unit controller display. Typically, configuration is only needed if advised by the network administrator. Key parameters include Receive Heartbeat, Max Send Time, and Min Send Time.

Enter Password

From the Main Menu, navigate to "Enter Password" and select it.
Enter password "6363" and press Enter.
Scroll to "BMS Communications" and press Enter.
Navigate to the "LON Set-Up" menu.

Set Receive Heartbeat

In the LON Set-Up menu, scroll to "RecHrtb", press Enter, and modify as directed by the network integrator.
Navigate back to the LON Set-Up menu to change other parameters as needed. Changes are saved automatically.

Parameter	Range/Default	Description/Notes
Neuron ID	Variable; Default: NA	Indicates the Neuron ID of the LonWorks communication module. The Neuron ID field displays zeros and does not populate until the communication module has been commissioned.
Max Send Time	0 - 6553.5 seconds; Default: 0 seconds	Maximum Send Time. Controls the maximum period of time that expires before certain network variables are transmitted. nciMaxSendTime can also be used to change these values¹.
Min Send Time	0 - 6553.5 seconds; Default: 10 seconds	Minimum Send Time. Controls the minimum period of time that expires before certain network variables can be retransmitted. nciMinSendTime can also be used to change these values¹.
Rcv Heartbeat	0 - 6553.5 seconds; Default: 0 seconds	Receive Heartbeat. Defines the maximum time that elapses after the last update to a specified network variable input before the unit starts to use default values. nciRCvHrtBt can also be used to change these values¹.
LON BSP²	10.14; Default: NA	Board Support Package. Displays the version of firmware loaded in the LonWorks communication module.
LON App Ver²	Variable	LonWorks application version. Displays the version of the chiller software application loaded in the LonWorks communication module. The asterisk (*) indicates the revision number. This parameter remains blank until the communication module is commissioned.

¹ Requires the use of LonMaker or other LonWorks configuration tool.

² The LON BSP and software application version are read-only.

Service Information

Troubleshooting

General

Review the Commissioning section.
If LEDs are inactive, remove and re-install the module. If issues persist, replace it.
Verify the LON Set-Up menu appears. If not, power cycle the unit controller.

Network Wiring and Connections

Check for faulty connectors and network ground faults.
Twist wires for network connections.
Use only approved cable types.
Adhere to bus length limits.
Confirm correct transceiver.
Avoid sources of electromagnetic interference (EMI).
Ensure the network trunk is not near a DC load switch.

Bus Terminators

Incorrect bus termination can cause signal issues. Verify correct terminators are used based on network topology (52.3 Ω for free topology, 105 Ω for line topology).

Network Performance

Slow or intermittent network traffic may require a network protocol analyzer or oscilloscope. Confirm power is applied to the unit controller.

Parts

Description	Part Number
MicroTech Commercial Rooftop and MicroTech 4 Applied Rooftop LonWorks Communication Module Kit, Space Comfort Controller (SCC). Kit includes communication module, board-to-board connector, and Installation Manual.	090016711
MicroTech/MicroTech 4 Applied Rooftop LonWorks Communication Module Kit, Discharge Air Controller (DAC). Kit includes communication module, board-to-board connector, and Installation Manual.	090016712

Technical Support

Contact Daikin Applied Controls Technical Support at 866-462-7829 for assistance. Refer to Unit Controller Operation Manuals and Integration Guides for more details.

Revision History

Revision	Date	Changes
IM 918	October 2008	Preliminary release.
IM 918-1	January 2009	Updated Figure 3 and text for setting service pin with hex key.
IM 918-2	October 2009 March 2012	Added Maverick II (MPS) model Updated to Daikin logo and references. Added Rebel to cover
IM 918-3	December 2019	Modified the BSP LED table to add the fail safe LED sequence.
IM 918-4	January 2021	Layout rebranded. Added MicroTech 4 Rebel Applied model type and associated references throughout.
IM 918-5	June 2023	Fixed incorrect Rebel Applied OM number in Reference Documents table and cross references used in the IM.
IM 918-6	December 2023	Branding and other formatting updates. Fixed incorrect module image on front cover.

Daikin Applied Training and Development

For training information on Daikin Applied HVAC products, visit www.DaikinApplied.com (Training section) or call 540-248-9646.

Warranty

Daikin Applied equipment is sold with a Limited Product Warranty. Consult your local Daikin Applied Representative for warranty details or find them at www.DaikinApplied.com.

Aftermarket Services

For parts, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787). For service, visit www.DaikinApplied.com or call 800-432-1342.

This document reflects the most current product information. Products are manufactured in an ISO Certified Facility.

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