Ebyte E842-DTU User manual

Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. E841-DTU（EC03-485）User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. E841-DTU（EC03-485）User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
Contents
1. Overview.................................................................................................................................. 错误！未定义书签。
1.1 Product Introduction.......................................................................................................错误！未定义书签。
1.2 Features...........................................................................................................................错误！未定义书签。
1.3 Application scenario.......................................................................................................错误！未定义书签。
2. Specifications........................................................................................................................... 错误！未定义书签。
2.1 Limit parameters.............................................................................................................错误！未定义书签。
2.2 Working parameters........................................................................................................错误！未定义书签。
3. Mechanical size and pin definition.......................................................................................... 错误！未定义书签。
4. Quick start and function introduction...................................................................................... 错误！未定义书签。
Quick start............................................................................................................................ 错误！未定义书签。
4.1 Hardware preparation.....................................................................................................错误！未定义书签。
4.2 Network transparent transmission mode........................................................................错误！未定义书签。
4.3 MQTT model..................................................................................................................错误！未定义书签。
Function introduction........................................................................................................... 错误！未定义书签。
4.4 ModBus TCP to RTU function.......................................................................................错误！未定义书签。
4.5 Serial port packaging function....................................................................................... 错误！未定义书签。
4.6 Network AT function......................................................................................................错误！未定义书签。
4.7 Register package function.............................................................................................. 错误！未定义书签。
4.8 Heartbeat packet function.............................................................................................. 错误！未定义书签。
4.9 Serial port upgrade......................................................................................................... 错误！未定义书签。
5. Precautions............................................................................................................................... 错误！未定义书签。
6. Related Products.......................................................................................................................错误！未定义书签。
Revision history............................................................................................................................错误！未定义书签。
About us........................................................................................................................................错误！未定义书签。

Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. E841-DTU（EC03-485）User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no liability
for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

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1. Overview
1.1 Introduction to the product
The E842-DTU (EC03-485) is a cost-effective 4G DTU developed using 4G CAT1 technology. The main
function is to realize the two-way transparent transmission of serial device and network server. The RS485
interface is used to support 85to265VAC voltage inputs. No communication distance limit, and has a wide
network coverage, strong anti-jamming ability advantages. Easy integration into IoT projects.
The equipment is mounted in a rail-type manner, which is small in size and easy to install. Set up with
simple AT instructions, or you can use configuration software settings to easily use this product for two-way data
transparent transmission from serial to network in just a few steps.
Devices support multiple links, MQTT protocols, APN/VPN, Access to OneNet, Baidu, Alibaba Cloud, and the Internet of Things.
Supports automatic conversion of Modbus RTUs and Modbus TCP to each other.
1.2 Features
Use a 4G CAT1 solution
Ability to meet almost all M2M application needs;
Supports transparent data transfer
Supports TCP,UDP network protocols
Support heartbeat package, registration package;
Supports network configuration parameters;
Supports simultaneous sending and receiving of 2 Socket links;
Supports automatic conversion of Modbus RTUs and Modbus TCP to each other;
Support MQTT protocol, support access to oneNet platform, Baidu cloud platform, Alibaba cloud platform MQTT services;
SUPPORT for APN/VPN;
Support for serial upgrade;
Support network AT instructions, through the network, remote configuration of devices;
The use of flame retardant plastic housing, rail-type installation structure, installation is convenient and efficient;
Power reverse protection, over-connected protection, antenna surge protection and other multiple protection functions to
enhance the reliability of the station;
Communication ports, power interfaces using isolation high protection;
Operating temperature range: -40degrees C to85degrees C, adapted to a variety of harsh working conditions
1.3 Scenario
Smart home and industrial sensors, etc.
Security system, positioning system;
Agricultural collection;
Healthcare products;

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Automotive applications.
2. Specifications
2.1 Limit parameters
The main parameter
performance
remark
minimum
maximum
Supply voltage(V).
85
265
110V or 220V is recommended
Operating temperature (sc).
-40
+85
Industrial grade
2.2 Working parameters
The name of the
argument
The value of
the argument
description
The attribute
parameters
Support for
bands
LTE-TDD: B34/B38/B39/B40/B41
LTE-FDD:
B1/B3/B5/B8
Network
protocol
characteristics
Supports the TCP/UDP/MQTT protocol
Hardware features
Antenna
interface
SMA-K
The power
interface
5.08 Terminals
The
communication
interface
RS485
baud rate
Supports a maximum of 921600bpsand a default of 115200bps
weight
95g tolerance ± 5g
size
92×62×30mm

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3. Mechanical dimensions and pin definitions
Pin
number
The pin
name
Pin use
1
485_A
The A side of the other RS485 devices that are external
2
485_B
The B side of the other RS485 devices that are external
3
GND
earthing
4
PWR
Power LED
5
DC
Power adapter interface, power supply range 8to28VD C;
6
Restore
The station restores factory settings
When the Restore dial continues down 3to10S, dial up to restore the radio
parameters to the factory settings
7
YES
Sim card slot
8
ON
Antenna interface(SMA-K outer thread inner hole,50o characteristic impedance).

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serial
number
name
function
illustrate
1
Restore
The factory reset
button
Press and hold 8S to restore the factory settings
2
ON
RF interface
SMA-K,outer thread inner hole, feature impedance of
50Ω
3
AC
The power interface
AC 85-265V power input port (E842),5.08mm wired
port
4
RS4852
RS485
The communication
port
A to the A side of the RS485 device, B to the B side
of the RS485 device, andG ND to the external device
5
PWR
Power LED
Lit when the power is on
6
STATE
The in-network status
indicator
Flashing: Power to the search network on the device
Solid: The device is successfully attached to the network
7
DATA
Data transceiver
indicator
Send/receive data flashing
8
LINE
The data link light
Solid:SocketA connects to the network server
successfully
Normally out:SocketA's connection to the network
server was not successful
9
LINKB
The data link light
Solid:The SocketB connected to the network server
successfully
Normally out:The SocketB connection to the network
server was not successful

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4. Quick start and feature introduction
Get started quickly
4.1 Hardware preparation
This test requires the following devices to be prepared:
Before testing, plug in the SIM card, connect the USB to RS485 serial cord, connect the antenna, and finally power on.
(At this point the PWR light goes on and theWORK light lights up after a few decades).
(The computer needs to install USB re-serial driver first, download the parameter configuration software in advance, you
can go to our official website to download).
4.2 Network transmission mode
Open the parameter configuration software
1、Select the appropriate port number
2、Select Baud Rate 115200(factory default).
3、Select Check, Data, Stop None,8,1(factory default).
4、Open the serial port
5、Click to enter configuration mode
6、Modify the server address or IP,port, connection type (in this case, the E.U.S. test server, you can fill in the
corresponding server information).
7、Click to save all parameters
8、Click on the module restart (at which point WORK,NET, etc. flashes and turns off to indicate a successful restart).

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9、Mobile phone attention to "E-Yi Special Internet of Things application experts" WeChat public number
10、Click on Customer Support
11、Click on the device test
12、After popping up the interface, click Continue access (go to the Step 6 server test interface).
13、The phone sends data and the device receives it
14、Device send data, mobile phone reception, two-way testing normal
4.3 MQTT mode
Open the parameter configuration software
1, select the appropriate port number
2, select Baud Rate 115200(factory default).
3, select check, data, stop bit None,8,1(factory default).
4, open the serial port
5, click to enter the configuration mode

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6、Click on MQTT mode
7、Select the corresponding cloud platform (standard MQTT protocol platform select Baidu cloud).
8、Fill in the device name, username, password, address, port, subscription, publish, and subscription publishing message
level
9、(Alibaba Cloud is the product key, device name, device key, address, port, subscription, publish, and subscription publishing
level.)
10、ONENET is the device ID,product ID,authentication information, address, port, subscription, publication, and subscription
publishing message level).
11、Click to save all parameters
12、Click the device to restart
Introduction to the feature
4.4 ModBus TCP to RTU feature
When this option is turned on using parameter configuration software, the ModBus TCP and RTU are automatically
converted.
When the device receives the data, it will detect whether the data meets the Modbus RTU or ModbusTCP protocol, and
if it does, start the conversion function or output the original data.
The device serial receives ModbusT RTU instructions in the following format(16 feed):
01 06 00 01 01 19 CA(ModbusT RTU),when the conversion is turned on, the server receives data for:00 00 00 00 00 06
01 06 00 01 00 01 01(ModbusT TCP).
The network side receives data as:00 00 00 00 00 06 01 06 00 01 00 01(ModbusT TCP)andthe device serial endoutputs
the data as: