Ebyte E840-DTU User manual

E840-DTU(4G-02)
4G/LTE Serial Server

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 1
Contents
1 PRODUCT OVERVIEW........................................................................................................................................................2
1.1. INTRODUCTION ......................................................................................................................................................................................2
1.2. FEATURES................................................................................................................................................................................................2
1.3 DTU PARAMETER ...................................................................................................................................................................................3
1.4 INTERFACE DESCRIPTION ......................................................................................................................................................................5
1.5 PIN DEFINITION .......................................................................................................................................................................................6
2.QUICK START ........................................................................................................................................................................7
2.1 HARDWARE .........................................................................................................................................................................7
2.1 DATA TRANSMISSION TEST................................................................................................................................................................. 10
2.2 NETWORK FUNCTION.......................................................................................................................................................................... 12
2.3 HIGH SPEED MODE............................................................................................................................................................................... 12
2.4 SMS FUNCTION.................................................................................................................................................................................... 15
3. AT COMMAND ................................................................................................................................................................... 18
4 NOTES.................................................................................................................................................................................... 29
5 IMPORTANT STATEMENT.............................................................................................................................................. 30
6 REVERSION HISTORY ..................................................................................................................................................... 31
7 ABOUT US............................................................................................................................................................................. 31

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 2
1 Product Overview
1.1. Introduction
E840-DTU (4G-02) is developed for serial port devices and
network servers to transmit data to each other through a network.It is a
LTE-FDD/LTE-TDD/WCDMA/TD-SCDMA/CDMA/GSM wireless
communication data transmission modem with diversity receiving
function, supporting LTE-FDD, LTE-TDD, DC-HSDPA, HSPA+,
HSDPA, HSUPA, WCDMA, TD-SCDMA, CDMA, EDGE and GPRS
network data connections, through simple AT commands Settings, you
can easily use this product to achieve two-way data transparent
transmission from serial to network.
The DTU is powered by the DC power supply or RS485 terminal
by a wide voltage of 8.0V to 28.0V. Support 4G card, RS485 and RS232. With circuits electrical isolation scheme for anti-interference
ability, it can be used in environments with strong electromagnetic interference, such as power industry. This manual is a quick
introduction to the modem E840-DTU (4G-02). It is the easiest hardware environment to test the E840-DTU (4G-02) network
transmission function, that is, to realize data being transmitted in both directions between the serial device (here, the computer) and the
network server.
1.2. Features
◼Almost meet all M2M application demands;
◼Support data transparent transmission, support TCP, UDP network protocol, support heartbeat package, registration
package function;
◼Support two-way serial transmission from device to network server for 230400 serial port baud rate and below,;
◼Support serial port large cache function, the serial port data can be cached locally before the server is established.;
◼Support SMS sending and receiving, SMS remote query / configuration device parameters;
◼Support multiple Socket links to send and receive at the same time;
◼Support Modbus RTU and Modbus TCP to automatically convert each other;
◼LTE-FDD:Max downstream rate of 150Mbps, Max upstream rate of 50Mbps,LTE-TDD:Max downstream rate of
130Mbps,Max upstream rate of 35Mbps;
◼With software/hardware double watchdog design, the system is stable, will never crash.

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
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1.3 DTU parameter
Parameter
Value
Description
Characteristic
Frequency
LTE-FDD:B1/B3/B5/B8
LTE-TDD:B38/B39/B40/B41
WCDMA:B1/B8
TD-SCDMA:B34/B39
CDMA:BC0
GSM:900/1800MHz
LTE
characteristic
Support max. of 3GPP R8 non-CA Cat 4 FDD 和TDD
Support 1.4MHz~20MHz
Downstream support:MIMO
LTE-FDD:Max downstream rate 150Mbps, Max upstream rate50Mbps
LTE-TDD:Max downstream rate 130Mbps, Max upstream rate35Mbps
UMTS
characteristic
support 3GPP R8 DC-HSDPA,HSPA+,HSDPA,HSUPA and WCDMA
Support QPSK,16-QAM and 64-QAM modulation
DC-HSDPA:Max downstream rate 42Mbps
HSUPA:Max upstream rate 5.76Mbps
WCDMA: Max downstream rate 384Kbps, Max upstream rate 384Kbps
TD-SCDMA
characteristic
support CCSA Release 3 TD-SCDMA
Max downstream rate 4.2Mbps, Max upstream rate 2.2Mbps
CDMA2000
characteristic
support 3GPP2 CDMA2000 1X Advanced and 1xEV-DO Rev.A
EVDO:Max downstream rate 3.1Mbps,Max upstream rate 1.8Mbps
1X Advanced:Max downstream rate 307.2Kbps,Max upstream rate 307.2Kbps
GSM
characteristic
R99:CSD tx rate:9.6kbps,14.4kbps
GPRS:support GPRS multiple time slot level 33(default 33),coding format:
CS-1/CS-2/CS-3/CS-4
max of 4 Rx time slot for each frame,Max downstream rate107Kbps,Max upstream
rate 85.6Kbps
EDGE:support EDGE multiple time slot level 33(default 33),support GMSK and 8-PSK
coding format
Downstream coding format:CS 1-4 and MCS 1-9,upstream coding format:CS 1-4
and MCS 1-9
Max downstream rate 296Kbps,Max upstream rate 236.8Kbps
Network protocol
characteristic
Support
TCP/UDP/PPP/FTP/HTTP/NTP/PING/QMI/NITZ/CMUX/HTTPS/SMTP/MMS/FTPS/
SMTPS/SSL/FILE protocol
support PAP (Password Authentication Protocol) and CHAP (ChallengeHandshake
Authentication Protocol)
Hardware
Characteristic
Antenna
SMA
Data interface
RS485 /RS232
Baud rate
Support max. 921600bps,default 115200bps

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 4
Transmitting power
Class 4 (33dBm±2dB) for GSM900
Class 1 (30dBm±2dB) for DCS1800
Class E2 (27dBm±3dB) for GSM900 8-PSK
Class E2 (26dBm±3dB) for DCS1800 8-PSK
Class 3 (24dBm+2/-1dB) for CDMA BC0
Class 3 (24dBm+1/-3dB) for WCDMA bands
Class 2 (24dBm+1/-3dB) for TD-SCDMA bands
Class 3 (23dBm±2dB) for LTE-FDD bands
Class 3 (23dBm±2dB) for LTE-TDD bands
Sensitivity
FDD B1: -101.6dBm (10M)
FDD B3: -101.9dBm (10M)
FDD B5: -102dBm (10M)
FDD B8: -102.1dBm (10M)
TDD B38: -101.3dBm (10M)
TDD B39: -101.2dBm (10M)
TDD B40: -101.4dBm (10M)
TDD B41: -101.4dBm (10M)
WCDMA B1: -112dBm
WCDMA B8: -112dBm
TD-SCDMA B34: -110dBm
TD-SCDMA B39: -110dBm
CDMA BC0: -108dBm
GSM 900: -109dBm
GSM 1800: -109dBm
Consumption(Typical):
11uA @power off
1.8mA @LTE sleep (PF=128)
1.5mA @LTE sleep (PF=256)
20mA @ free
Bandwidth
1.4/3/5/10/15/20MHz
Operating temperature
-30℃- +70℃, extending to -40℃~+85℃
Operating voltage
DC 8V~28V
Size
82×84×24mm
RS485 /RS232
RS485 /RS232
3GPP frequency
TX(MHz)
RX(MHz)
EGSM900
880~915
925~960
DCS1800
1710~1785
1805~1880
CDMA BC0
824~849
869~894
WCDMA B1
1920~1980
2110~2170
WCDMA B8
880~915
925~960
TD-SCDMA B34
2010~2025
2010~2025
TD-SCDMA B39
1880~1920
1880~1920
LTE-FDD B1
1920~1980
2110~2170
LTE-FDD B3
1710~1785
1805~1880
LTE-FDD B5
824~849
869~894
LTE-FDD B8
880~915
925~960
LTE-TDD B38
2570~2620
2570~2620
LTE-TDD B39
1880~1920
1880~1920
LTE-TDD B40
2300~2400
2300~2400
LTE-TDD B41
2555~2655
2555~2655

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 6
1.5 Pin definition
Pin No.
Name
Description
1
RS232
RS232
2
485_A
Connect to port A of other RS485 devices
3
485_B
Connect to port B of other RS485 devices
4
GND
Ground
5
VCC
Power supply,range: 8~28V
6
PWR
Power indicator
7
WORK
Blue: Data receiving and transmitting indicator, when the network receives data or the
serial port receives data (50ms high/10ms low)
Green: device status indicator,
Low: The device is powered on to search for SIM card
1800ms low, 200ms high: the device checks the correct SIM card and is
attaching to the network;
High: The device is attached to the network successfully.
8
NET
Green: SocketA link connection status indication pin
High: SocketA is successfully connected to the web server;
Low: SocketA did not successfully connect to the network server;
Blue: SocketB link connection status indication pin
High: SocketB is successfully connected to the web server;
Low: SocketB did not successfully connect to the network server;
9
DC8~28V
For power adaptor,range: 8~28V
10
RST
Reset switch(downward,reset)
11
Restore
Operating dip switch
Once power on,let DTU switch top-down for 3~10S,and bottom-up,then DTU
enters factory setting and restart immediately
12
SIM
SIM
13
ANT
Antenna(SMA-K,50Ω impedance match)

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 7
2.Quick start
2.1 Hardware
Hardware for test are as follows:
UART cable connected according to recommended circuit diagram,SIM card and antenna
E840-DTU(4G-02)
12V Power Adaptor
USB to RS485 converter or USB to RS232 converter
(optional)
LTE sucker antenna
Connect the power supply, antenna, SIM card, serial cable and other hardware before testing.
1. Access the official website of EBYTE: www.ebyte.com, to download the latest GPRS/E840-DTU series product
configuration tool, install USB to 232/485 driver, run the software!
2. Select the corresponding COM port number. The factory default serial port baud rate is 115200, 8N1, as shown

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 8
below:
1. Click the tool "Enter Configuration Status" button and wait for the device parameters to be automatically obtained. After
completion, the following figure is displayed::
2. Query the signal strength, set the device connection server IP and port number to be: 116.62.42.192, 8124; (Ebyte
test server), and finally click "Save all parameters", and finally as shown below::

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 9
3. Click the tool "Module Restart" button and wait for the device LINK light to be on.
4, Search "Ebyte IoT expert" WeChat public number, enter the page, click: Customer Support -> Device
Test, the mobile phone screenshot interface is as follows:
5. Use the PC-side tool to send data to, and use the mobile phone to send data to the device. The communication test

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 10
result is as shown below:
2.1 Data transmission test
⚫Software tools used for the test are as follows:
Any serial port assistant, XCOM is used in this manual, which can be downloaded from our official website.
2.1.1 Operating mode is as follows:
1、operating mode includes:transparent transmission mode、AT configuration mode
a) Transparent transmission mode: After power-on, the radio works in the transparent transmission mode by default, and
automatically starts the network connection. When the connection is established with the server, any data received by the serial
port will be transparently transmitted to the server. At the same time, it can also receive data from the server. After receiving the
server data, the module will output directly through the serial port. The maximum length of data supported by this module is
1024 bytes. When multiple links are connected to the server at the same time, the data packet will be sent to the four links at the
same time. When there are data to be sent from any network link, the radio will transparently output the data.
b) Protocol transmission: This module supports 4-channel Socket connections. For each socket users can configured it as TCP
Client or UDP Client. When sending data, users can use protocol transmission or transparent transmission.
Protocol transmission format
Transmit:0x55 0xFE 0xAA ID data
For example:55 FE AA 02 AA BB //02: SOCK2 link,AA BB:the data that the user actually needs to
transmit
Receive:0xAA 0XFE 0x55 ID data length Data

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 11
For example: AA FE 55 00 00 03 11 22 33 //00: SOCK0 link, 00 03:the valid data length received this
time 11 22 33:real data
Demonstration:
Take SOCK2 as an example:,
Transmit:+++(do not add new line for transmitting ) //enter AT command
Transmit:AT+VER(add new line for transmitting ) //read version info. And enter AT command setting at the
same time
+OK=E840-DTU(4G-01)_V1.0
Transmit :AT+SOCK2=1,TCPC,116.62.42.192,31687 //open SOCK2 and configure the network server
parameters that SOCK2 will connect to (the parameter used
here is Ebyte test server, not recommended for users)
+OK
Transmit:AT+LINKSTA2 //read if SOCK2 has started connection with server
+OK=Connect
Transmit:AT+POTOCOL=ON // open protocol transmission mode
+OK
Transmit:AT+POTOCOL //inquire if protocol transmission is on
+OK=ON
AT+REBT //restart
+OK
Waiting for the radio to restart, SOCK2 will automatically establish a connection with the server. After the connection is
started, data can be transmitted to each other via protocol.

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 12
a) AT mode:under this mode all UART data is considered as AT command.
b) Mode switch,In the transparent transmission mode, after the serial port receives the "+++" frame data, the RX pin receives
any AT command within 3 seconds, and the mode switches to the AT mode. In AT mode, send AT+EXAT<CR><LF> to
switch to transparent transmission mode.
2.2 Network function
a) Short connection: In TCP Client mode, the short connection function is enabled. If there is no data reception in the
serial port or network port within the set time, the network connection will be automatically disconnected. The short
connection function is turned off by default. The connection time can be set from 2 to 255 seconds. When set to 0, the short
connection function is disabled.
b) Registration package: The registration package is closed by default. The user can configure 4 types of registration
packages. You can choose to send the physical address (IMEI code) when connecting, send custom data when connecting,
add the physics before the connection and each packet of data. Custom data is added to the address, connection time, and
data before each packet. The maximum length of the custom registration packet is 40 bytes (when set to HEX format, the
maximum length is 20 bytes).
c) Heartbeat packet: In the idle state of network communication, the heartbeat packet is used for network state
maintenance. The heartbeat period can be set from 0 to 65535 seconds, and the maximum length of the heartbeat packet is
40 bytes (when set to HEX format, the maximum length is 20 bytes). Supports two heartbeat types: network heartbeat and
serial heartbeat. When the network heartbeat is selected, the communication idle time starts, and the heartbeat data packet
is sent to the server according to the configured heartbeat period. Select the serial port heartbeat, start timing with
communication idle, and send heartbeat packets to the serial port according to the configured heartbeat period.
Clear the cache: Before the connection to the server is established, the data received by the serial port will be
cached. When the connection with the server is established, you can choose whether to clear the cached data. By default,
the cache is cleared. The maximum size of each Socket in the local cache is 128 bytes, and each Socket buffer is
independent of each other.
2.3 High speed mode
The E840-DTU (4G-02) is designed with a separate high-speed mode. In this mode, both the network and the device can transmit any
packet length data, such as file, picture, and video.
Configure/query the high-speed mode state through the AT+HSPEED command. After the high-speed mode is enabled, the device can
transmit any packet length data at 230400 serial port baud rate and below.
The E840-DTU (4G-02) file transfer process will be demonstrated below:
1. Turn on the device high-speed mode: After the device enters the AT mode, send AT+HSPEED=ON to enable the high-speed mode,
configure the connected server address, and restart the device.

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 13
2. Ready to transfer the file. The file transferred in this demo is RF_Setting3.49.exe. The file is an executable file. After startup, the
following interface is displayed:
3. Open the serial port tool and use the file sending method to open RF_Setting3.49.exe. After the device is connected to the
network server normally, click “send file” and the sending is completed as shown below.:
4. The server (the external network mapping used for this demo, the server is the TCP debugging tool), after receiving the data, it
is as follows:

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 15
6. Click on the server to run RF.exe to test the file, as shown below:
In summary, the E840-DTU (4G-02) completes the remote transfer of files from the serial port to the network server.
2.4 SMS function
E840-DTU (4G-02) can support SMS sending and receiving, SMS remote configuration function (inserted SIM card needs to
support SMS service).
a) SMS sending: In AT mode, send AT+SMSSEND=number, data to complete the SMS sending, where number
refers to the receiving number, and data refers to the data to be sent.
The demo is shown below:

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 17
+SMS REC:number
Data, where number is the sender's mobile phone number and data is the received short message content;
b) SMS configuration/query: The device can support SMS remote configuration/inquiry parameters in transparent transmission mode. The
format of the transmission format command is:
<Head>AT+CMD, where <Head> is the device SMS identifier. The factory default is: EbyteSMS, CMD is the corresponding command.
Specifically, you can view the introduction of AT commands.
In this demonstration, remotely use the mobile phone to query the SOCK1 link information of the device:
5. Modbus RTU and Modbus TCP are mutually converted;
E840-DTU (4G-02) supports the mutual conversion between Modbus RTU and ModbusTCP. After the function is enabled, after
receiving the data, the device will detect whether the data meets the Modbus RTU or ModbusTCP protocol. If it meets the
requirement, the conversion function is enabled. Otherwise, it will output/send original data.
a) For example, the serial port receives the ModbusT RTU write-out command in the following format (hexadecimal):
01 06 00 01 00 01 19 CA (ModbusT RTU), when the conversion function is enabled, the data received by the server is: 00 00 00
00 00 06 01 06 00 01 00 01 (ModbusT TCP)
b) When the data received by the network is: 00 00 00 00 00 06 01 06 00 01 00 01 (ModbusT TCP), the serial port of the device will
output the data : 01 06 00 01 00 01 19 CA (ModbusT RTU);
Note: In the Modbus TCP standard protocol, the transaction element identifier needs to be specified. In E840-DTU (4G-02), the
user can configure the value through AT+MTCPID, and when the value is configured to 0, the receiving end All data
conforming to the Modbus TCP protocol will be parsed, otherwise only packets with the same application packet identifier and
device configuration identifier will be converted.
6 Base station positioning function;
The E840-DTU (4G-02) supports the base station positioning function. The user can send the AT+LBS command in the AT mode
to read the current LBS information of the device. The device returns the data format as follows:
+OK=LAC,xxxx;CID,xxxx, where LAC is the unique identification number of the global cell, CID is the base station number,
(xxxx is the hexadecimal value);
The LAC and CID number can be used to query the current location information of the device. For the query method, refer to the
link: http://www.gpsspg.com/bs.htm

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 18
7 Serial port packaging function;
The E840-DTU (4G-02) serial port break time and packing length can be configured. The user can configure the frame break
time and the package length through the AT+UARTTS command. Please refers to the AT command for the specific configuration .
a) Frame break time: When the serial port receives data, it will continuously detect the interval between two bytes. If it is greater
than the configuration time (50-2000ms), the device will automatically send the previously received data as a data packet to Network
side;
b) Packing length: When the serial port receives data, it will continuously check the length of the currently received data. If the
length of the configuration is exceeded (20~1024 bytes), the device will automatically send the previously received data as a data
packet to Network side;
8 Enable Ebyte IoT platform function
The AT+EBTIOT command is used to set whether the module enables the transparent transmission function of the EBYTE
cloud platform, after it is turned on, the information such as the heartbeat and registration packet configured by the user will be
invalid. The user only needs to set the forwarding relationship of the corresponding device to the platform to implement the
device. Data is transparent. For details of the related operations, please refer to the "Ebyte Cloud Platform Transparent
Transmission Guide".
3. AT command
a) Command format:
AT+<CMD>[op][ para1, para2, para3,…]<CR><LF>
AT+:command front end
CMD:control command
[op]:“=” indicates parameter configuration
“NULL”indicates parameters inquire
[para-n]:parameter list
<CR><LF>:CRLF,ASCII 0x0D 0x0A
b) Command error code:
Error code
Description
-1
Invalid command format
-2
Invalid command
-3
Invalid operator
-4
Invalid parameter
-5
Operation prevented
c) Command set:
REBT
restart module
VER
inquire version No.
INFO
inquire device info.
EXAT
exit AT command mode
RESTORE
restore to factory configuration
UART
set/inquire UART parameter
UARTCLR
set/inquire if UART buffer is cleared before module is

Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright ©2012–2019,Chengdu Ebyte Electronic Technology Co. LTD. 19
connected
IMEI
inquire IMEI
LINKSTA
inquire SOCK connection status
LINKSTA1
inquire SOCK1 connection status
LINKSTA2
inquire SOCK2 connection status
LINKSTA3
inquire SOCK3 connection status
SOCK
set/inquire SOCK parameter
SOCK1
set/inquire SOCK1 parameter
SOCK2
set/inquire SOCK2 parameter
SOCK3
set/inquire SOCK3 parameter
REGMOD
set/inquire register packet mode
REGINFO
set/inquire self-defined registration info.(ASCII)
REGINFONEW
set/inquire self-defined registration info (ASCII ,HEX)
HEARTMOD
set/inquire heartbeat packet mode
HEARTINFO
set/inquire self-defined heartbeat packet info.(ASCII)
HEARTINFONEW
set/inquire heartbeat packet info.(ASCII, HEX)
HEARTM
set/inquire heartbeat packet time
SHORTM
set/inquire short connection time
EBTIOT
set/inquire to enable Ebyte IoT Cloud Platform
CREG
Inquire if it is registered to network
CSQ
Inquire signal strength
CPIN
Inquire SIM card status
POTOCOL
set/inquire if protocol transmission mode starts
UARTEX
set/inquire serial port parameter(9600,8,N,1)
ICCID
Inquire SIM card’s ICCID
HSPEED
set/inquire if high speed continuous transmission is
opened
LBS
set/inquire base station information (base station
positioning)
UARTTS
set/inquire serial port packing length and gap
SMSSEND
Send message
SMSINFO
set/inquire message setting identifier
MODBUS
set/inquire ModbusTCP/RTU switch function
MTCPID
set/inquire ModbusTCP event identifier
RSTIME
set/inquire server response timeout
a) Command Description:
AT+REBT
Function:Restart module
Format:configure
Transmit:AT+REBT<CR>
return:<CR><LF>+OK<CR><LF>
Parameter:None
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