EBYTE E841-DTU Wireless Modem User Manual
- June 6, 2024
- ebyte
Table of Contents
EBYTE E841-DTU Wireless Modem
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Overview
Introduction to the product
The E841-DTU (EC03-485) is acost-effective 4G DTU developed using 4GCAT1
technology. The main function is to realize the two-way transparent
transmission of serial device and network server. With the RS485 interface,
support for 8to28VDC 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 IoT applications. Supports automatic conversion of Modbus RTUs and Modbus TCP to each other.
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 one Net 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 Cto adapt to avariety of harsh working environments
Scenario
- Smart home and industrial sensors, etc.
- Security system, positioning system;
- Agricultural collection;
- Healthcare products;
- Automotive applications.
Specifications
Limit parameters
The main parameter
| performance|
remark
---|---|---
minimum| maximum
Supply voltage(V).| 8| 28| 12V or 24V is recommended
Operating temperature (sc).| -40| +85| Industrial grade
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
|
power|
Standby: 35mA@12V
|
consumption
(Related to the
In-network: 91mA@12V|
environment
and other
Transfer:142mA@12V
|
factors, for
informational
purposes only)
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).
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| DC| The power interface| DC 8-28V power input port,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
Quick start and feature introduction
Get started quickly
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).
Network transmission mode
Open the parameter configuration software
-
Select the appropriate port number
-
Select Baud Rate 115200(factory default).
-
Select Check, Data, Stop None,8,1(factory default).
-
Open the serial port
-
Click to enter configuration mode
-
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).
-
Click to save all parameters
-
Click on the module restart (at which point WORK,NET, etc. flashes and turns off to indicate a successful restart).
-
Mobile phone attention to “E-Yi Special Internet of Things application experts” WeChat public number 10、Click on Customer Support
-
Click on the device test
-
After popping up the interface, click Continue access (go to the Step 6 server test interface).
-
The phone sends data and the device receives it
-
Device send data, mobile phone reception, two-way testing normal
-
Device send data, mobile phone reception, two-way testing normal
MQTT mode
Open the parameter configuration software
-
select the appropriate port number
-
elect Baud Rate 115200(factory default).
-
select check, data, stop bit None,8,1(factory default).
-
open the serial port
-
click to enter the configuration mode
Copyright
©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. -
Click on MQTT mode
-
Select the corresponding cloud platform (standard MQTT protocol platform select Baidu cloud).
-
Fill in the device name, username, password, address, port, subscription, publish, and subscription publishing message level
-
(Alibaba Cloud is the product key, device name, device key, address, port, subscription, publish, and subscription publishing level.)
-
ONENET is the device ID,product ID,authentication information, address, port, subscription, publication, and subscription publishing message level).
-
Click to save all parameters
-
Click the device to restart
Introduction to the feature
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)and the device serial end outputs the data as:
01 06 00 01 00 01 19 CA（ModbusT RTU）
Note: In the Modbus TCP standard protocol, the thing element identifier is specified, and in E841-DTU (EC03-485), the user can configure the value through at -MTCPID, and when the value is configured to 0, the receiving end resolves and converts all Modbus TCP-compliant data, otherwise only the packet identifier applied will be converted with the same identifier as the device configuration.
Serial
packaging feature
E841-DTU (EC03-485) serial frame break time and packaging length can be
configured, and the user can configure frame break time and package length
through parameter configuration software.
Frame break time: When the frame break time receives data for a serial port,
the interval between two bytes of phase collar is constantly detected, and if
it is greater than the user’s configured time (which can be set to
50-2000ms),the device automatically sends the previously received data as a
packet to the network side;
Package length: When packaging the length of the serial to receive data, the
currently received data length is constantly checked, if the length of the
user configuration (can be set to 20 to 1024 bytes), the device will
automatically receive the previously received data as a packet to the network
side; 
Network
AT functionality
E841-DTU (EC03-485)) supports networking on the connection, and the module works in transmission mode after sending commands in the following format via connected web pages, remote query/configuration parameters
< Head > AT-CMD, where the < Head > is the device network AT identifier, which is factory default: EbyteNET, and CMD is the corresponding command(Note: For the wrong network AT instruction, a unified reply is made to
the .ERRER). This demo takes the query Baud Rate as an example: 
The
registration package feature
Registration packages are turned off by default, and users can configure 4
types of registration packages, with the option of sending a physical address
(IMEI code) at connection time, sending custom data at connection time,
appending physical address at connection time, and before each packet of data,
adding custom data at connection time and before each package of data, and
customizing registration numbers The maximum length of the package is 80 bytes
(up to 40 bytes when set to HEX format), which can be set by the parameter
configuration software. 
Heartbeat pack function
In the idle state of network communication, the heartbeat package is used for
network state maintenance. The heartbeat period can be set from 0 to 65535
seconds, with a maximum length of 80 bytes (up to 40 bytes when set to HEX
format). Support network heartbeat, serial heartbeat two types of heartbeat,
when selected as a network heartbeat, to communicate idle start timing,
according to the configured heartbeat cycle to the server to send heartbeat
packets. Select as a serial heartbeat to communicate idle start timing,
according to the configured heartbeat cycle to the serial heartbeat packets,
can be set by the parameter configuration software. 
Serial upgrade
Open the E-Yi Special Serial Upgrade Tool, select the serial port and open it,
import the version firmware that needs to be upgraded, click the Start Upgrade
button 
The device
is powered off and restarted, automatically completing the upgrade. 
Precautions
- The first Socket of this module is always open. After successful initialization, it will automatically establish a connection with the configured network server.
- After the module is powered on, it has not been able to initialize successfully, that is, there is no indication on the State indicator for more than 30 seconds. At this time, check whether the module is installed normally, whether the SIM card is inserted normally, and whether the SIM has failed.
- The short connection function can be used to reduce the connection pressure of multiple devices to the server. When the short connection function is enabled, when there is no data on the network or serial port for longer than the short connection setting period, the module will actively disconnect the connection. After disconnection, the network cannot send data. The local serial port sends valid data, and the module will immediately communicate with The server establishes a connection. If the local cache clear function is turned off at this time, the data packet will be cached (maximum 10K bytes). After the connection is successful, the data will be sent to the server. If the local cache clear function is enabled, The packet will be discarded.
- The heartbeat function is used to maintain the connection after the module has successfully established a connection with the server. In the network, if there is no data transmission for a long time after the client has successfully established a connection with the network server, the Socket link may appear “dead”, that is, the chain The path exists, but data cannot be sent or received. Therefore, in actual use, it is recommended to enable the heartbeat packet function to ensure the reliability of the network link.
- In actual use, it is normal for the data delay difference between the two communications to be different.
- After the module closes the protocol transmission, the maximum single packet length supported by a single link is 10K bytes. The local serial port or network single transmission of data packets exceeding this length may cause packet abnormalities; open the distribution protocol, each SocKet A single link packet can support up to 1024 bytes (the serial port packet length configured by the user),
- When the device serial port outputs the words “pdp error, device will be reset!”, it means that the PDP context is disabled by the network side. It may be that the SIM card is loose or the current network channel is occupied abnormally.
- The SMS function requires the inserted SIM card to support the SMS service, and the IoT card cannot send and receive SMS; when the device sends a SMS, the device responds OK only to indicate that the module has sent the SMS, but it does not mean that the device has received the SMS.
- After modifying the serial port frame time, the AT command also needs to be configured to operate according to this frame time. For example: after setting this parameter to 2000ms, the next time you power on the device to configure the device parameters, you need to send’+++’ After that, send a valid AT command within the period of more than 2000ms and less than 3000ms to enter the AT mode normally
Related products
Product model
| products category| The communication interface| Operating
voltage| Introduction to the product
---|---|---|---|---
E841-DTU(EC03-485)
| ****
4G Cat1
| ****
RS485
| ****
8～28V（DC）
| 4GDTU, MQTTsupport, APNsupport, rail housing, DC power supply
E841-DTU(EC03-232)
| ****
4G Cat1
| ****
RS232
| ****
8～28V（DC）
| 4GDTU, MQTTsupport, APNsupport, rail housing, DC power supply
E841-DTU(EC03P-485)
| ****
4G Cat1
| ****
RS485
| ****
8～28V（DC）
| 4GDTU, MQTTsupport, APNsupport, rail housing, high protection, DC power supply
E841-DTU(EC03P-232)
| ****
4G Cat1
| ****
RS232
| ****
8～28V（DC）
| 4G DTU, MQTTsupport, APNsupport, rail housing, high protection, DC power supply
E842-DTU(EC03-485)
| ****
4G Cat1
| ****
RS485
| ****
85～265V（AC）
| 4G DTU, MQTTsupport, APN,rail housing, AC power supply
E842-DTU(EC03-232)
| ****
4G Cat1
| ****
RS232
| ****
85～265V（AC）
| 4G DTU, MQTTsupport, APN,rail housing, AC power supply
E842-DTU(EC03P-485)
| ****
4G Cat1
| ****
RS485
| ****
85～265V（AC）
| 4G DTU, MQTTsupport, APNsupport, rail housing, high protection, AC power supply
E842-DTU(EC03P-232)
| ****
4G Cat1
| ****
RS232
| ****
85～265V（AC）
| 4G DTU, MQTTsupport, APNsupport, rail housing, high protection, AC power supply
E840-DTU(EC03)
| ****
4G Cat1
| ****
RS485+RS232
| ****
8～28V（DC）
| 4G DTU, MQTTsupport, aluminum profile housing, high protection, DC power supply
Revised history
version| The revision date| Revised description|
Maintainer
---|---|---|---
1.0| 2017-10-16| The initial version| huaa
1.1| 2021-07-15| Content reorganization| LYL
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
Phone: +86 028-61399028
Web: www.ebyte.com
Address: B5 Mould Park, 199# Xiqu Ave, High-tech District, Sichuan, China
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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