EBYTE E95-DTU Wireless Module User Manual

User Manual for EBYTE models including: E95DTU, 2ALPH-E95DTU, 2ALPHE95DTU, E95-DTU, Wireless Module

李燕玲

User Manual

Chengdu Ebyte Electronic Technology Co., Ltd. E95DTU Wireless Data transceiver 2ALPH-E95DTU 2ALPHE95DTU e95dtu

File Info : application/pdf, 24 Pages, 2.29MB

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E95-DTU(400SL22-485)

Chengdu Ebyte Electronic Technology Co.,Ltd

E95-DTU(400SL22-485) User Manual

Contents
1. Introduction ............................................................................................................................................................. 3 1.1 Brief Introduction .......................................................................................................................................... 3 1.2 Features.......................................................................................................................................................... 3 1.3 Quick Start ..................................................................................................................................................... 4 1.4 Parts Description............................................................................................................................................ 6 1.5 Size ................................................................................................................................................................ 7
2. Interface Description ............................................................................................................................................... 7 2.1 Power interface description ........................................................................................................................... 7 2.2 Communication interface description ............................................................................................................ 8
3. Technical Index........................................................................................................................................................ 9 3.1 Model specification ....................................................................................................................................... 9 3.2 General specifications.................................................................................................................................... 9 3.3 Frequency range and channel number ........................................................................................................... 9 3.4 Transmit power level ................................................................................................................................... 10 3.5 Air speed class ............................................................................................................................................. 10 3.6 Current parameter ...................................................................................................................................... 10 3.7 Sending and receiving length and data separate method ............................................................................. 10
4. Function Details..................................................................................................................................................... 11 4.1 Fixed-point transmission (hexadecimal)...................................................................................................... 11 4.2 Broadcast transmission (hexadecimal) ........................................................................................................ 11 4.3 Broadcast address ........................................................................................................................................ 12 4.4 Listening address ......................................................................................................................................... 12
5. Operating mode ..................................................................................................................................................... 12 5.1 Transparent transmission mode (mode 0) .................................................................................................... 12 5.2 WOR mode (mode 1)................................................................................................................................... 13 5.3 Configuration mode (mode 2)...................................................................................................................... 13 5.4 Deep sleep mode (mode 3) .......................................................................................................................... 13
6. Register read and write control.............................................................................................................................. 13 6.1 Instruction format ........................................................................................................................................ 13 6.2 Register description ..................................................................................................................................... 14 6.3 Factory default parameters........................................................................................................................... 17
7. Relay Network Mode Use ..................................................................................................................................... 17 8. PC Configuration Instructions ............................................................................................................................... 18 9. Program the DTU .................................................................................................................................................. 19 10. Connection Diagram in Test and Practical Application ....................................................................................... 20 11. Related Products .................................................................................................................................................. 20 12. Practical Application............................................................................................................................................ 21 13. Precautions for Use.............................................................................................................................................. 22 Important Statement .................................................................................................................................................. 23 Revision History ........................................................................................................................................................ 23 About us..................................................................................................................................................................... 23

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1. Introduction

E95-DTU(400SL22-485) User Manual

1.1 Brief Introduction
E95-DTU (400SL22-485) is a wireless data transmission DTU that uses military-grade LoRa modulation technology. It has a variety of transmission methods. It works in the 433MHz. The DTU provides a transparent RS485 interface, plastic shell, rail type installation structure, support 8-28V voltage input. LoRa spread spectrum technology will bring a longer communication distance, and has the advantage of strong anti-interference ability.
As a communication medium, wireless data transmission station has a certain scope of application like optical fiber, microwave and open wire: it provides real-time and reliable data transmission of monitoring signals in private networks under certain special conditions, with low cost, installation and maintenance convenience, strong diffraction ability, flexible network structure, and long coverage. It is suitable for many and scattered locations and complex geographic environments. It can be connected with PLC, RTU, rain gauge, level gauge and other data terminals.
1.2 Features
Using the latest LoRa technology, it is farther and more powerful than traditional LoRa digital DTU; With data encryption, and the packet length can be set; Adopt flame-retardant plastic shell, guide rail type installation structure, convenient and efficient installation Hidden buttons are used to switch working modes to avoid false triggers, and the equipment is more reliable in operation; Simple high-efficiency power supply design, support power supply configuration or line pressure mode, support 8 ~ 28V
power supply; Support LBT function, the DTU automatically waits for transmission according to the current environmental noise
intensity. Greatly improve the communication success rate of the DTU in harsh environments; Support wireless sending of command data packets, remote configuration or reading of DTU parameters;
Support communication key function, effectively prevent data from being intercepted; It can realize multi-level relay networking, effectively expand the communication distance, and realize ultra-long distance communication; Using temperature compensation circuit, the frequency stability is better than ± 1.5PPM;
Working temperature range: -40+85, adapt to various harsh working environments, real industrial grade products; Multiple protection functions such as power reverse connection protection, over-connection protection, antenna surge protection, etc., greatly increase the reliability of the DTU; Powerful software function, all parameters can be set by programming: such as power, frequency, air rate, address ID, etc.;
Ultra-low power consumption, standby current is only 15mA (lower power consumption in power-saving mode and sleep mode); Built-in watchdog and precise time layout. Once an abnormality occurs, the DTU will automatically restart and continue to work according to the previous parameter settings.

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1.3 Quick Start
Prepare two E95-DTU (400SL22-485)

E95-DTU(400SL22-485) User Manual

First install the antenna for the digital DTU, and then install the power supply. The user selects the power adapter for power supply according to the needs.

Use USB to RS-485 or other methods to connect the computer to the digital DTU;

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E95-DTU(400SL22-485) User Manual

Start two serial port debugging assistants, select the serial port baud rate to be 9600bps (default), and the check method to be 8N1 to make serial port transparent transmission;

If the customer needs to switch the working mode, it can be controlled by the Mode button to switch between different working modes (M0 indicator, M1 indicator). Press and hold the Mode button for about 1 S and then release it to switch modes. The mode switching details are shown in the table below:

No.

Type

Description

Mode 0

Transparent Transmission
Mode

Light Off

Serial port open, wireless open, transparent transmission (factory default mode), support special command air configuration

Mode 1

WOR Mode

Light Off

Light On

Can be defined as WOR sender and WOR receiver, support air wakeup

Mode 2

Configuration Mode

Light On

Light Off

The user accesses the register through the serial port to control the working status of the DTU. The user can configure the DTU through the computer configuration software.

Mode 3

Deep Sleep Mode

Light On

DTU goes to sleep mode

Note: The DTU has a power-down save mode function (the factory default setting is transparent transmission mode),

the user needs to switch the corresponding mode according to the M1 and M0 indicators (effective immediately).

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1.4 Parts Description

E95-DTU(400SL22-485) User Manual

No.

Name

Function

Description

Mode

Mode switch button Working mode switching control

ANT

RF interface

SMA-KExternal thread inner hole

Power supply

DC power input port, pressure line port

RS485

RS485 interface

Standard RS-485 interface

PWR

Power indicator

Lights up when the power is on

TXD

Sending indicator Flashes when sending data

RXD

Receiving indicator Flashes when receiving data

Mode indicator

Working mode indicator

Mode indicator

Working mode indicator

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1.5 Size

E95-DTU(400SL22-485) User Manual

2. Interface Description 2.1 Power interface description

Unit: mm

E95-DTU can be powered by 828V DC power supply, it is recommended to use 12V or 24V DC power supply. The wiring port adopts wiring terminal (2 Pin) connection.

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2.2 Communication interface description
E95-DTU can use 3.81 terminal block to connect with equipment through RS-485.

E95-DTU(400SL22-485) User Manual

Standard No.
definition

Function

Description

signal ground

Anti-interference, grounding

RS-485 bus A interface

RS-485 A interface is connected to device A interface

RS-485 bus B interface

RS-485 B interface is connected to device B interface

Note: The communication is not smooth when connecting the DTU to multiple devices, but there is no such phenomenon in a single device. Please try to connect a 120 resistor in parallel between the 485_A terminal and the 485_B terminal.

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3. Technical Index

E95-DTU(400SL22-485) User Manual

3.1 Model specification

Model

Working Frequency
Hz

Distance km

Specifications

Recommended Application Scenarios

E95-DTU(400SL22-485)

433MHz

Suitable for

LoRa Spread

environments with long

spectrum

distances and susceptible

anti-interference

to interference

Note: Sunny, open environment without obstruction, 12V/1A power supply, 5dBi suction antenna, antenna height 2 meters from the ground, use factory default parameters.

3.2 General specifications

No.

Term

Specification

Description

Size

92*67*30 mm

Review installation dimensions for details

Weight

95 g

Weight tolerance 5g

Working

-40+85

Meet the needs of industrial use

Temperature

Voltage Range

828V DC

Recommend to use 12V or 24V

Interface

RS485

3.81 terminal block

Baud Rate

Default 9600

Baud rate range 1200115200

Address Code

Default 0

A total of 65536 address codes can be set

3.3 Frequency range and channel number

Model E95-DTU(400SL22-485)

Default Frequency
Hz
433MHz

Frequency Range
Hz 433MHz

Channel Spacing
Hz
1M

Number of Channels 1Half Duplex

Note: In the same area, multiple groups of digital DTUs are used for one-to-one communication at the same time. It is recommended that each group of digital DTUs set the channel spacing above 2MHz.

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E95-DTU(400SL22-485) User Manual

3.5 Air speed class

Model E95-DTU(400SL22-485)

Default Air Rate bps
2.4k

Level 8

Air Speed Class bps
0.31.22.44.89.619.238.462.5k

Note: The higher the air speed setting, the faster the transmission rate and the shorter the transmission distance; therefore, when the speed meets the requirements of use, it is recommended that the airspeed be as low as possible.

3.6 Current parameter

Model E95-DTU(400SL22-485)

Transmitting Current mA

12V

24V

Waiting Current mA

12V

24V

Note: It is recommended to reserve more than 50% of the current margin when selecting the power supply, which is conducive to the long-term stable operation of the DTU.

3.7 Sending and receiving length and data separate method

Model E95-DTU(400SL22-485)

Cache Size 1000 Bytes

Data Separate Method Data can be separated sent with 32/64/128/240 bytes by
command

Note: 1. If the DTU's single received data is greater than the single packet capacity, the excess data will be automatically allocated to the
second transmission until the transmission is completed; 2. The single received data of the DTU cannot be larger than the buffer capacity.

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4. Function Details 4.1 Fixed-point transmission (hexadecimal)

E95-DTU(400SL22-485) User Manual

4.2 Broadcast transmission (hexadecimal)

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4.3 Broadcast address

E95-DTU(400SL22-485) User Manual

Example: Set the address of DTU A to 0xFFFF and the channel to 0x04. When DTU A is used as a transmitter (same mode, transparent transmission mode), all receiving DTU under the 0x04 channel
can receive data to achieve the purpose of broadcasting.

4.4 Listening address

Example: Set the address of DTU A to 0xFFFF and the channel to 0x04. When DTU A is receiving, it can receive all the data under channel 0x04 to achieve the purpose of monitoring.

5. Operating mode

E95-DTU has four working modes. When there is no demanding low power consumption requirement, it is recommended to configure the DTU to transparent transmission mode (mode 0) if normal communication is required; The default setting of the DTU at the factory is transparent transmission mode (mode 0).

No.

Type

Description

Mode 0

Transparent transmission
mode

Light Off

Serial port open, wireless open, transparent transmission (factory default mode), support special command air configuration.

Mode 1

WOR Mode

Light Off

Light On

Can be defined as WOR sender and WOR receiver, support air wakeup

Mode 2

Configuration Mode

Light On

Light Off

The user accesses the register through the serial port to control the working status of the DTU. The user can configure the DTU through the upper computer configuration software.

Mode 3

Deep Sleep Mode

Light On

DTU goes to sleep mode.

Note: If there is no low power consumption requirement, no need to care about WOR mode (mode 1).

5.1 Transparent transmission mode (mode 0)

Type

When the M0 indicator light is off and the M1 indicator light is off, the DTU is working in mode 0

Sending

Users can input data through the serial port, and the DTU will start wireless transmission.

Receiving

The DTU receiving function is turned on, and after receiving the wireless data, it will be output through the serial port TXD pin.

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5.2 WOR mode (mode 1)

E95-DTU(400SL22-485) User Manual

Type

When the M0 indicator light is on and the M1 indicator light is off, the DTU is working in mode 1

Sending

When defined as the transmitter, the wake-up code for a certain period of time will be automatically added before transmission

Receiving Data can be received normally, and the receiving function is equivalent to mode 0

5.3 Configuration mode (mode 2)

Type

When the M0 indicator light is off and the M1 indicator light is on, the DTU is working in mode 2

Sending

Can be configured wirelessly

Receiving Can be configured wirelessly

Configurating The user can access the register to configure the working status of the radio

5.4 Deep sleep mode (mode 3)

Type

When the M0 indicator light is on and the M1 indicator light is on, the DTU is working in mode 3

Sending

Unable to transmit data wirelessly.

Receiving

Unable to receive data wirelessly.

6. Register read and write control

6.1 Instruction format
In configuration mode (mode 2: M1 indicator light is on, M0 indicator light is off), the supported command list is as follows (when setting, only 9600, 8N1 format is supported):

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No.

Instruction Format

Detailed Description

Command: C0+start address+length+parameter

C1+start address+length+parameter

E95-DTU(400SL22-485) User Manual

Example 1: Configure the channel as 0x09

Instruction Start Address Length Parameter

Send C0

Set Register Return C1

Example 2: Configure the radio address (0x1234), network address (0x00), serial port (9600 8N1), airspeed (1.2K) at the same time Send C0 00 04 12 34 00 61 ReturnC1 00 04 12 34 00 61
Command: C1+start address+length Response: C1+start address+length+parameter

Example 1: Read the channel

Instruction Start Address Length Parameter

Read Register Send C1

Return C1

Example 2: Read the DTU address, network address, serial port, airspeed at the same time Send C1 00 04 ReturnC1 00 04 12 34 00 61
Command: C2 + start address + length + parameters Response: C1 + start address + length + parameters

Example 1: Configure the channel as 0x09

Instruction Start Address Length Parameter

Set Up

Send C2

01 09

Temporary Register

Return C1

01 09

Example 2: Configure the DTU address (0x1234), network address (0x00), serial port (9600 8N1), airspeed (1.2K) at the same time Send C2 00 04 12 34 00 61 ReturnC1 00 04 12 34 00 61
Instructions: CF CF + regular instructions Response: CF CF + regular response

Example 1: The wireless configuration channel is 0x09

Wireless Command Header Command Start Address Length Parameter

Wireless

Send

Configuration Return

CF CF CF CF

01 09 01 09

Example 2: Wirelessly configure the DTU address (0x1234), network address (0x00), serial port (9600 8N1), airspeed (1.2K) at the same time Send CF CF C0 00 04 12 34 00 61 ReturnCF CF C1 00 04 12 34 00 61

Format Error

Format Error Response FF FF FF

6.2 Register description

Read and

No.

Name

Write

Description

00H Read/Write ADDH ADDHDefault 0

01H Read/Write ADDL ADDLDefault 0

Remarks
High byte and low byte of radio address; Note: When the DTU address is equal to FFFF, it can be used as the broadcast and monitor address, that is: the DTU will not perform address filtering at this time

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E95-DTU(400SL22-485) User Manual

02H Read/Write NETID NETIDDefault 0

Network address, used to distinguish networks; When communicating with each other, they should be set to the same.

7 6 0 0 0 0

5 UART serial port rate (bps) 0 The serial port baud rate is 1200 1 The serial port baud rate is 2400

For two DTUs that communicate with each other, the serial port baud rate can be different, and the verification method can also be different;

0 1
0 1
1 0 1 0 1 1 1 1

0 The serial port baud rate is 4800

When continuously transmitting large data

The serial port baud rate is 9600 packets, users need to consider the data

1 default

congestion caused by the same baud rate, and may even be lost;

0 The serial port baud rate is 19200

1 The serial port baud rate is 38400 It is generally recommended that the baud

0 The serial port baud rate is 57600 rate of the two communication parties be the

1 The serial port baud rate is 115200 same.

4 3 Serial parity bit

03H Read/Write

0 0 REG0
0 1
1 0

8N1default 8O1 8E1

The serial port mode of the two communication parties can be different;

1 1 8N1 00

2 1

0 Wireless air rate (bps)

0 0

0 Air speed 0.3k

0 0

1 Air speed 1.2k

0 1

0 Air speed 2.4kdefault

The air rate of both parties must be the same;

0 1 1 0

1 Air speed 4.8k 0 Air speed 9.6k

The higher the air rate, the smaller the delay and the shorter the transmission distance.

1 0

1 Air speed 19.2k

1 1

0 Air speed 38.4k

1 1

1 Air speed 62.5k

7 6 0 0 0 1 1 0

Data Packet Separate setting 240 Bytesdefault 128 Bytes 64 Bytes

1 1 32 Bytes

5 RSSI Environmental noise enable 04H Read/Write REG1 0 Disabled (default)

1 Enable

The data sent by the user is less than the data packet separate length, and the serial port output of the receiving end appears as an uninterrupted continuous output;
If the data sent by the user is larger than the data packet separate length, the serial port of the receiving end will be output in packets. After enabling, you can send commands C0 C1 C2 C3 in transmission mode or WOR sending mode to read registers; Register 0x00: Current environmental noise RSSI; Register 0X01: RSSI when receiving data last time (The current channel noise is: dBm =-RSSI/2); Instruction format: C0 C1 C2 C3 + start address + read length; Return: C1 + address address + read length + read effective value; for example: send C0 C1 C2 C3 00 01 Return C1 00 01 RSSI

4 3

2 Remain

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E95-DTU(400SL22-485) User Manual

The relationship between power and current is non-linear, and the power supply has the highest efficiency at maximum power;

The current will not decrease in the same proportion as the power decreases.

Channel Control (CH)

1 05H Read/Write REG2

Actual frequency = 433MHz

7 Enable RSSI byte 0 Disabled (default) 1 Enable 6 Transfer method 0 Transparent transmission (default) 1 Fixed point transmission 5 Relay function 0 Disable relay function (default)
1 Enable relay function
4 LBT Enable 0 Disabled (default)

After being enabled, the DTU receives wireless data and outputs it through the serial port TXD, followed by an RSSI strength byte.
During fixed-point transmission, the DTU will recognize the three bytes of serial data as: address high + address low + channel, and use it as a wireless transmission target.
After the relay function is enabled, if the target address is not the DTU itself, the DTU will start a forwarding; In order to prevent data from returning, it is recommended to use it in conjunction with the fixed-point mode; that is, the destination address is different from the source address. After enabling, monitoring will be conducted before wireless data transmission, which can avoid interference to a certain extent, but may cause data delay;

1 Enable

The maximum stay time of LBT is 2 seconds, and it will be issued forcibly when it reaches 2 seconds.

3 WOR Mode send and receive control 06H Read/Write REG3
WOR receiver (default)

Only valid for mode 1;

The transceiver is turned on, and when 0
transmitting data, a wake-up code for a certain period of time is added. WOR transmitter The DTU cannot transmit data, and it works in 1 WOR monitoring mode. The monitoring period is

After the WOR receiver receives the wireless data and outputs it through the serial port, it will wait 1000ms before entering the WOR again. The user can input the serial port data during this period and return it via wireless;
Each serial port byte will be refreshed for 1000ms;

shown below (WOR period), which can save a lot of power consumption.

The user must initiate the first byte within 1000ms.

2 1 0 0 0 0 0 1 0 1 1 0

0 WOR Cycle 0 500ms 1 1000ms 0 1500ms 1 2000ms 0 2500ms

Only valid for mode 1;
Cycle T= (1+WOR)*500ms, the maximum is 4000ms, the minimum is 500ms;
The longer the WOR monitoring interval period, the lower the average power consumption, but the greater the data delay;

1 0 1 1

1 3000ms 0 3500ms

Both sender and receiver must agree (very important)

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E95-DTU(400SL22-485) User Manual

1 1 1 4000ms

07H

Write

CRYPT High byte of key _H (default 0)

08H

Write

CRYPT Low byte of key _L (default 0)

Only write, read returns 0; Used for encryption to avoid interception of wireless data in the air by similar DTUs; The DTU will use these two bytes as a calculation factor to transform and encrypt the air wireless signal.

80H

Read

86H

PID

Product information 7 bytes

7. Relay Network Mode Use

No.

Relay mode description

After setting the relay mode through the configuration mode, switch to the normal mode and the relay starts to work.

In relay mode, ADDH and ADDL are no longer used as radio addresses, but correspond to NETID

forwarding and pairing respectively. If one network is received, it will be forwarded to another network.

The network ID of the repeater itself is invalid.

In the relay mode, the relay station cannot send and receive data, and cannot perform low-power operation.

When the user enters other modes from mode 3 (sleep mode) or is in the reset process, the radio will reset the user parameters, during which AUX outputs low level.

Description of relay networking rules: 1Forwarding rules, the relay can forward data in both directions between two NETIDs. 2In the relay mode, ADDH\ADDL is no longer used as a DTU address, but as a NETID forwarding pairing. As shown: Primary relay "Node 1" NETID is 08. "Node 2" NETID is 33. The ADDH\ADDL of relay 1 are 08 and 33 respectively. So, the signal sent by node 1 (08) can be forwarded to node 2 (33) At the same time, node 1 and node 2 have the same address, so the data sent by node 1 can be received by node 2.

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Secondary relay

E95-DTU(400SL22-485) User Manual

The ADDH\ADDL of relay 2 are 33 and 05 respectively.

So, Relay 2 can forward the data of Relay 1 to the network NETID: 05.

Therefore, node 3 and node 4 can receive node 1 data. Node 4 normally outputs data, and node 3 has a different address from node 1, so no data is output.
Two-way relay

As shown in the configuration: the data sent by node 1 can be received by nodes 2 and 4, and the data sent by nodes 2 and 4 can also be received by node 1.

8. PC Configuration Instructions
The following figure shows the display interface of the E95-DTU (400SL22-485) configuration host computer. The user can switch to the configuration mode through the MODE button, and quickly configure and read the parameters on the host computer.

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E95-DTU(400SL22-485) User Manual

In the configuration of the host computer, the DTU address, frequency channel, network ID, and key are all in decimal display mode, and the value range of each parameter: Network Address: 065535 Frequency Channel: 1 Network ID0255 Key: 065535
When using the host computer to configure the relay mode, the user needs to pay attention. Since the parameters in the host computer are in decimal display mode, the DTU address and network ID need to be converted when filling in. If the network ID input by the transmitting terminal A is 02, and the network ID input by the receiving terminal B is 10, when the relay terminal R sets the radio address, the hexadecimal value 0X020A is converted to the decimal value 522 as the relay terminal R. Radio address. That is, the radio address value that needs to be filled in by the relay terminal R at this time is 522.

9. Program the DTU

Operating

Mode

Remark

Configuration mode

Light On

Light Off

Only use the configuration software to program the DTU in the current mode

1 Programming can only be carried out in a specific working mode (see the above table). If the programming fails, please

confirm whether the working mode of the DTU is correct.
2 If you don't need complicated programming to open the E95-DTU (400SL22-485) configuration software, you can modify the

relevant parameters.

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E95-DTU(400SL22-485) User Manual

10. Connection Diagram in Test and Practical Application

11. Related Products

Model
E95-DTU(400SL30-485) E95-DTU(400F20-485) E95-DTU(433L20-485) E95-DTU(433L30-485) E95-DTU(433L20-232) E95-DTU(433L30-232) E95-DTU(400F20-232) E95-DTU(400SL22-232) E95-DTU(400SL30-232)

Interfac e Type RS485 RS485 RS485 RS485 RS232 RS232 RS232
RS232 RS232

Frequency Hz 410.125/493.125M
410/510M 410/441M 410/441M 410/441M 410/441M 410/510M 410.125/493.125M 410.125/493.125M

Transmit power dBm 30
20
20 30 20 30
20
22 30

Distance km

Features

Cost-effective LoRa, Rail Type, RS232, 10
E90-DTU SL series intercommunication

Ultra-low price digital DTU, Rail Type,

RS485,, E90-DTU F series

intercommunication

Cost-effective LoRa, Rail Type, RS485, 3
E90-DTU L series intercommunication

Cost-effective LoRa, Rail Type, RS485, 8
E90-DTU L series intercommunication

Cost-effective LoRa, Rail Type, RS232, 3
E90-DTU L series intercommunication

Cost-effective LoRa, Rail Type, RS232, 8
E90-DTU L series intercommunication

Ultra-low price digital DTU, Rail Type,

RS232,, E90-DTU F series

intercommunication

Cost-effective LoRa, Rail Type, RS232, 5
E90-DTU SL series intercommunication

Cost-effective LoRa, Rail Type, RS232, 10
E90-DTU SL series intercommunication

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12. Practical Application

E95-DTU(400SL22-485) User Manual

Ebyte DTU is suitable for all kinds of point-to-point and point-to-multipoint wireless data transmission systems, such as smart homes, IoT transformation, power load monitoring, distribution automation, hydrology and water regime monitoring and reporting, tap water pipe network monitoring, urban street lights Industrial automation such as monitoring, air defense alarm control, railway signal monitoring, railway water supply centralized control, oil and gas supply pipeline network monitoring, GPS positioning system, remote meter reading, electronic hoisting scale, automatic target reporting, earthquake observation and reporting, fire prevention and theft prevention, environmental monitoring, etc. System, as shown below:

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13. Precautions for Use

E95-DTU(400SL22-485) User Manual

1. Please take good care of the warranty card of the device. The warranty card contains the factory number (and important technical parameters) of the device, which has important reference value for the user's future maintenance and new equipment.
2. During the warranty period, if the DTU is damaged due to the quality of the product itself rather than man-made damage or natural disasters such as lightning strikes, it enjoys free warranty; please do not repair by yourself, and contact our company if there is a problem. Ebyte provides first-class After-sales service.
3. Do not operate this DTU in the vicinity of some flammable places (such as coal mines) or explosive dangerous objects (such as detonators for detonation).
4. A suitable DC stabilized power supply should be selected, which requires strong anti-high frequency interference, small ripple, and sufficient load capacity; preferably, it should also have over-current, over-voltage protection and lightning protection functions to ensure that the DTU is normal jobs.
5. Do not use it in a working environment that exceeds the environmental characteristics of the DTU, such as high temperature, humidity, low temperature, strong electromagnetic field or dusty environment.
6. Don't let the DTU continuously be in full load transmitting state, otherwise the transmitter may be burnt out. 7. The ground wire of the DTU should be well connected with the ground wire of the external equipment (such as PC, PLC, etc.)
and the ground wire of the power supply, otherwise the communication interface will be burnt easily; do not plug or unplug the serial port with power on. 8. When testing a DTU, you must connect a matching antenna or a 50 dummy load, otherwise the transmitter will be easily damaged; if the antenna is connected, the distance between the human body and the antenna should be more than 2 meters to avoid injury. Touch the antenna when transmitting. 9. Wireless data transmission stations often have different communication distances in different environments. The communication distance is often affected by temperature, humidity, obstacle density, obstacle volume, and electromagnetic environment; in order to ensure stable communication, it is recommended to reserve more than 50% The communication distance margin. 10. If the measured communication distance is not ideal, it is recommended to analyze and improve the communication distance from the antenna quality and antenna installation method. You can also contact support@cdebyte.com for help. 11. When selecting the power supply, in addition to keeping 50% of the current margin as recommended, it should also be noted that its ripple must not exceed 100mV. 12. Wireless communication products need to be connected to an impedance-matched antenna to work normally. Even short-term tests cannot be omitted. Product damage caused by this reason will not be covered by the warranty.

Chengdu Ebyte Electronic Technology Co.,Ltd
Important Statement

E95-DTU(400SL22-485) User Manual

1. Ebyte reserves the right of final interpretation and modification of all contents in this manual. 2. Due to the continuous improvement of product hardware and software, this manual may be changed without prior notice. The
latest version of the manual shall prevail. 3. It is everyone's responsibility to protect the environment: In order to reduce the use of paper, this manual only prints the Chinese
part, and the English manual only provides electronic documents. If necessary, please download it from our official website; in addition, if not specifically requested by the user, the user can order in bulk At the time, we only provide product manuals according to a certain percentage of the order quantity, not every DTU is matched with it, please understand.

Revision History
Version 1.0

Date 2020-08-17

Description Original Version

Issued By ken

About us
Technical support: support@cdebyte.com Documents and RF Setting download link:www.ebyte.com Thank you for using Ebyte products! Please contact us with any questions or suggestions: info@cdebyte.com ----------------------------------------------------------------------------------------------------------------------------- ----Official hotline:028-61399028 Web: www.ebyte.com Address: B5 Mould Park, 199# Xiqu Ave, High-tech District, Sichuan, China

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This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

References

Microsoft Word 2010