Ebyte E840-dtu User manual

4G/LTE Serial Server

E840-DTU（4G-01）

User Manual

This manual may change with the continuous improvement of the product. Please refer to the latest version of the instruction.

Chengdu Ebyte Electronic Technology Co., Ltd. reserves all rights of final interpretation and modification of this manual.

4G/LTE Serial Server E840-DTU（4G-01）User Manual

Version No.

Date

Description

Issued by

1.00

2018/07/16

Initial version

huaa

E840-DTU (4G-01) is a developed for serial devices and network servers to transmit data to each other via network. This product is a

LTE-FDD/LTE-TDD/WCDMA/TD-SCDMA /CDMA/GSM wireless communication data transmission station with diversity reception 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,

users can easily use this product to achieve two-way data transparent transmission from serial to network.

This manual is a quick introduction to the E840-DTU (4G-01) modem. With the easiest hardware environment to test the E840-DTU (4G-01) network

transmission function, that is, to realize the serial device (the computer) to the network server. Data is transmitted in both directions.

Features

Almost meet all M2M application demands;

Support data transparent transmission, support TCP, UDP network protocol, support heartbeat package, registration package function；

Support serial port caching function, the serial port data can be cached locally before the connection is established with the server;

LTE-FDD：Max downstream rate of 150Mbps， Max upstream rate of 50Mbps，LTE-TDD：Max downstream rate of 130Mbps，Max upstream rate of

35Mbps；

Support TCP/UDP；

Support 8~28V wide voltage supply, adopt both DC power supply and terminal power supply；

Electrical isolation is used for RS485 circuit, which has lightning protection, anti-surge scheme, and anti-interference ability.

4G/LTE Serial Server E840-DTU（4G-01）User Manual

Contents

1. PRODUCT INTRODUCTION......................................................................................................................................................... 3

1.1. BRIEF INTRODUCTION....................................................................................................................................................................3

1.2. DTU PARAMETER......................................................................................................................................................................... 3

1.3. INTERFACE DESCRIPTION................................................................................................................................................................6

1.4. PIN DEFINITION............................................................................................................................................................................ 7

2. QUICK START..................................................................................................................................................................................7

2.1. HARDWARE.................................................................................................................................................................................. 7

2.2. DATA TRANSMISSION TEST............................................................................................................................................................ 9

2.2.1. Operating mode is as follows：

........................................................................................................................................

4. AT COMMAND.............................................................................................................................................................................12

5. NOTES............................................................................................................................................................................................19

6. IMPORTANT STATEMENT..........................................................................................................................................................19

7. ABOUT US.....................................................................................................................................................................................20

4G/LTE Serial Server E840-DTU（4G-01）User Manual

1. Product introduction

1.1. Brief introduction

E840-DTU (4G-01) is an LTE digital radio modem product developed by Ebyte. The software is fully functional and covers most common application scenarios.

Users can implement two-way data transparent transmission between serial and network server with simple settings. .

The radio is powered by the DC power supply or RS485 terminal by a wide voltage of 8.0V to 28.0V. Support mobile, China Unicom, Telecom 4G card. Electrical

isolation scheme is used for RS485 and RS232 circuits, With anti-interference ability, it can be used in some environments with strong electromagnetic interference,

such as power industry.

1.2. 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 and TDD

support 1.4MHz~20MHz rf band

Downstream supports： 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 和 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 和 1xEV-DO Rev.A

EVDO： Max downstream rate 3.1Mbps， Max upstream rate1.8Mbps

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： 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

Downstream coding format：CS1-4 和 MCS 1-9，upstream coding format: CS 1-4 和 MCS

1-9

Max downstream rate296Kbps， Max upstream rate 236.8Kbps

4G/LTE Serial Server E840-DTU（4G-01）User Manual

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 (Challenge Handshake

Authentication Protocol)

Hardware

Antenna

SMA Interface

Data interface

RS485 /RS232

Baud rate

Support max 921600bps，default 115200bps

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

4G/LTE Serial Server E840-DTU（4G-01）User Manual

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 @ idle

Bandwidth

1.4/3/5/10/15/20MHz

Operating temperature

-30℃- 75℃

Operating voltage

DC 8V~28V

Size

82×84×24mm

RS485 /RS232

Electrical isolation, RS485/RS232

3GPP Frequency

Transmitting（MHz）

Receiving（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

TD-SCDMA B39

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

LTE-TDD B39

1880~1920

LTE-TDD B40

2300~2400

LTE-TDD B41

2555~2655

4G/LTE Serial Server E840-DTU（4G-01）User Manual

1.3. Interface description

4G/LTE Serial Server E840-DTU（4G-01）User Manual

1.4. Pin definition

Pin No.

Name

Description

RS232

485_A

Connect to port A of other RS485 devices

485_B

Connect to port B of other RS485 devices

GND

Ground

VCC

Power supply，range: 8~28V

PWR

Power indicator

WORK

UART communication indicator

NEL

DTU SOCK0 network operating indicator

Off：Initiating

Flash quickly：Initiating failed（indicator off for 1900ms，on for 100ms）

Flash slowly：connect to base station，building communication with network server (indicator off for 300ms，

on for 100ms)

On：connect to server

DC8~28V

For power adaptor，range: 8~28V

RST

Reset switch（downward，reset）

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

SIM

ANT

Antenna（SMA-K，50Ω impedance match）

2. Quick start

2.1. Hardware

Hardware for test are as follows：

One piece of E840-DTU(4G-01) modem

One piece of 12V power adaptor

USB to RS485 converter or USB to RS232 converter (optional)

One piece of LTE sucker antenna(TXGN-XP-300)

4G/LTE Serial Server E840-DTU（4G-01）User Manual

Before testing, connect the serial cable, SIM card, antenna and other hardware according to the recommended circuit.

1、 1. Enter the AT command mode and send +++ in the serial port assistant (except for +++ , one does not need to check to send a new line,

other AT commands need to check to send a new line to be valid), one must send any other AT command within 3s after sending +++

command (except for restarting the AT command) to enter the AT command mode completely.

2、 After entering AT command mode，use AT+CPIN to check SIM card connection status：

For example：AT+CPIN

+OK=1

Means SIM card is connected，use AT+CSQ to read current signal strength;

For example：AT+CSQ

+OK=26

Indicates that the current signal strength is normal. If the response is 99, the current signal strength is abnormal. Check whether the current

antenna is connected or whether the surrounding base station is abnormal.

Execute the parameter modification command. If the baud rate is modified, it needs to be restarted to be valid.

3、 Connect to server，AT+SOCK=TCPC,116.62.42.192,31687 （The parameters are separated by commas in English characters, and the IP

commands are separated by English characters.），for SOCK1，SOCK2，SOCK3，one needs to add an enable command on the front end.

SOCK setting

For example：AT+SOCK=TCPC,116.62.42.192,31687

+OK

SOCK1、SOCK2、SOCK3 setting

For example：AT+SOCK=0,TCPC,116.62.42.192,31687

+OK

Setting succeed。

4、Restart

After returning +OK, it is necessary to restart the command AT+REBT to be valid. Here, the IP is only used for demonstration. The actual

connection is based on the IP of the server to be connected.

4G/LTE Serial Server E840-DTU（4G-01）User Manual

4、 4. After the base station is connected, the NET light is always on to indicate that the server is connected, and transparent transmission is

available.

2.2. 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.

2.2.1. 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

4G/LTE Serial Server E840-DTU（4G-01）User Manual

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

For example： AA FE 55 02 03 11 22 33 //02: SOCK2 link， 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.

4G/LTE Serial Server E840-DTU（4G-01）User Manual

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、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.

3. 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".

4G/LTE Serial Server E840-DTU（4G-01）User Manual

4. 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：

Command

Description

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 connected

MAC

inquire MAC address

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）

4G/LTE Serial Server E840-DTU（4G-01）User Manual

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

a) Command Description：

AT+REBT

Function： Restart module

Format： configure

Transmit：AT+REBT<CR>

return：<CR><LF>+OK<CR><LF>

Parameter：None

Description：After the command is executed correctly, the module restarts immediately and enters the transparent transmission mode after restarting.

AT+VER

Function： inquire firmware version

Format： configure

transmit AT+VER<CR><LF>

return <CR><LF>+OK=<ver><CR><LF>

Parameter：ver firmware version

Description：None

AT+INFO

Function： Inquire module type and version info.

Format： configure

transmit AT+INFO<CR><LF>

return <CR><LF>+OK=<mod_name>,<hw_ver>,<sw_ver><CR><LF>

Parameter： mod_name module name

hw_ver hardware version

sw_ver software version

Description：None

AT+EXAT

Function： exit command mode，enter transparent transmission mode

Format： configure

transmit AT+EXAT<CR><LF>

return <CR><LF>+OK<CR><LF>

Parameter：None

Description: After the command is executed correctly, the module is switched from command mode to the transparent transmission mode.

AT+RESTORE

Function： restore factory configuration

Format： configure

transmit AT+RESTORE<CR><LF>

return <CR><LF>+OK<CR><LF>

Parameter：None

Description：None

AT+UART

Function： set/inquire UART parameters

4G/LTE Serial Server E840-DTU（4G-01）User Manual

Format： inquire

transmit：AT+UART<CR>

return：<CR><LF>+OK=<baudrate>,< parity ><CR><LF>

configure

transmit：AT+UART=<baudrate>,< parity ><CR><LF>

return：<CR><LF>+OK<CR><LF>

Parameter： baudrate baud rate 1200~921600bps，self-defined

Parity Parity NON E None

EVEN

ODD

description：none

AT+UARTCLR

Function： Set/inquire whether to clear the serial port cache before connecting the module.

Format： Inquire

transmit：AT+ UARTCLR <CR>

return：<CR><LF>+OK=< sta ><CR><LF>

configure

transmit：AT+ UARTCLR =< sta ><CR>

return：<CR><LF>+OK<CR><LF>

Parameter： sta status

ON Clear the serial port cache before connecting.

OFF Do not clear the serial port cache before connecting.

AT+MAC

Function： inquire MAC.

Format： inquire

transmit：AT+MAC<CR>

return：<CR><LF>+OK=<mac><CR><LF>

Parameter： mac MAC address of module

AT+IMEI

Function： inquire the IMEI of module

Format： inquire

transmit：AT+IMEI<CR>

return：<CR><LF>+OK=<imei><CR><LF>

parameter： imei IMEI of module

AT+LINKSTA

Function： inquire whether TCP connection is established

Format： inquire

transmit：AT+LINKSTA<CR>

return：<CR><LF>+OK=<sta><CR><LF>

Parameter： Sta whether establish TCP connection，Connect(TCP connection)/ Disconnect(TCP cut off)

AT+LINKSTA1

Function： inquire TCP whether TCP connection is established

Format： inquire

transmit：AT+LINKSTA1<CR>

return：<CR><LF>+OK=<sta><CR><LF>

Parameter： Sta whether establish TCP connection，Connect(TCP connection)/ Disconnect(TCP cut off)

AT+LINKSTA2

4G/LTE Serial Server E840-DTU（4G-01）User Manual

Function： inquire whether TCP connection is established

Format： inquire

transmit：AT+LINKSTA2<CR>

return：<CR><LF>+OK=<sta><CR><LF>

Parameter： Sta whether establish TCP connection，Connect(TCP connection)/ Disconnect(TCP cut off)

AT+LINKSTA3

Function： inquire whether TCP connection is established

Format： inquire

transmit：AT+LINKSTA3<CR>

return：<CR><LF>+OK=<sta><CR><LF>

Parameter： Sta whether establish TCP connection，Connect(TCP connection)/ Disconnect(TCP cut off)

AT+SOCK

Function： Set/query the network protocol parameter format.

Format： inquire

transmit：AT+SOCK<CR>

return：<CR><LF>+OK=<protocol>,<ip>,< port ><CR><LF>

configure

transmit：AT+SOCK=<protocol>,<ip>,< port ><CR>

return：<CR><LF>+OK<CR><LF>

Parameter： protocol protocol type， TCPC / UDPC

TCPC corresponding TCP client

UDPC corresponding UDP client

Ip The IP address or domain name of the target server when the module is set to "CLIENT"

Port The port number of the server, in decimal, less than 65535.

AT+SOCK1

Function： Set/query the network protocol parameter format.

Format： inquire

transmit：AT+SOCK1<CR>

return：<CR><LF>+OK=<EN>,<protocol>,<ip>,< port ><CR><LF>

configure

transmit：AT+SOCK1=<EN>,<protocol>,<ip>,< port ><CR>

return：<CR><LF>+OK<CR><LF>

Parameter： EN enable 0：turn off SOCK1

1：turn on SOCK1

protocol type， TCPC / UDPC

TCPC corresponding TCP client

UDPC corresponding UDP client

Ip The IP address or domain name of the target server when the module is set to "CLIENT"

Port The port number of the server, in decimal, less than 65535.

AT+SOCK2

Function： Set/query the network protocol parameter format.

Format： inquire

transmit：AT+SOCK2<CR>

return：<CR><LF>+OK=<EN>,<protocol>,<ip>,< port ><CR><LF>

configure

transmi：AT+SOCK2=<EN>,<protocol>,<ip>,< port ><CR>

return：<CR><LF>+OK<CR><LF>

Parameter： EN enable 0：turn off SOCK2

4G/LTE Serial Server E840-DTU（4G-01）User Manual

1：turn on SOCK2

protocol type， TCPC / UDPC

TCPC corresponding TCP client

UDPC corresponding UDP client

Ip The IP address or domain name of the target server when the module is set to "CLIENT"

Port The port number of the server, in decimal, less than 65535.

AT+SOCK3

Function： Set/query the network protocol parameter format.

Format： inquire

transmit：AT+SOCK3<CR>

return：<CR><LF>+OK=<EN>,<protocol>,<ip>,< port ><CR><LF>

configure

transmit：AT+SOCK3=<EN>,<protocol>,<ip>,< port ><CR>

return：<CR><LF>+OK<CR><LF>

Parameter： EN enable 0：turn off SOCK3

1：turn on SOCK3

protocol type， TCPC / UDPC

TCPC corresponding TCP client

UDPC corresponding UDP client

Ip The IP address or domain name of the target server when the module is set to "CLIENT"

Port The port number of the server, in decimal, less than 65535.

AT+REGMOD

Function： Set the query registration package mechanism.

Format： inquire

transmit：AT+REGMOD<CR>

return：<CR><LF>+OK=<status><CR><LF>

configure

transmit：AT+REGMOD =<status><CR>

return：<CR><LF>+OK<CR><LF>

Parameter：status registration package mechanism.

EMBMAC adds MAC/IMEI as registration packet data before each packet sent to the server.

EMBCSTM adds custom registration package data before each packet is sent to the server.

OLMAC sends a MAC/IMEI registration packet only when it is first linked to the server.

OLCSTM sends a user-defined registration package only the first time it is linked to the server.

OFF Disables the registration of the packet mechanism.

AT+REGINFO

Function Set the contents of the query custom registration package

Format: Query

transmit：AT+ REGINFO <CR>

return：<CR><LF>+OK=<data><CR><LF>

configure

transmit：AT+ REGINFO =<data><CR>

return：<CR><LF>+OK<CR><LF>

Parameter：data ASCII in 40 bytes

AT+REGINFONEW

Function： set inquire self-defined registration package content

Format： inquire

transmit：AT+ REGINFONEW<CR>

4G/LTE Serial Server E840-DTU（4G-01）User Manual

return：<CR><LF>+OK=<type>,<data><CR><LF>

configure

transmit：AT+ REGINFONEW =<type>,<data><CR>

return：<CR><LF>+OK<CR><LF>

Parameter：type

0 Registration package type is HEX

1 Registration package type is ASCII code

data

ASCII code within 40 bytes, when the registration packet type is HEX, the content must be in the legal HEX format and the length must be an

even number.

AT+HEARTMOD

Function： set/inquire heartbeat mode

Format： inquire

transmit：AT+ HEARTMOD<CR>

return：<CR><LF>+OK=<mode><CR><LF>

configure

transmit：AT+ HEARTMOD=<mode><CR>

return：<CR><LF>+OK<CR><LF>

parameter：mode

NET Network heartbeat package

UART UART heartbeat package

AT+HEARTINFO

Function： Set/inquire heartbeat package data

Format： inquire

transmit：AT+ HEARTINFO<CR>

return：<CR><LF>+OK=<data><CR><LF>

configure

transmit：AT+ HEARTINFO=<data><CR>

return：<CR><LF>+OK<CR><LF>

Parameters: ASCII heartbeat packet data within 40 bytes of data.

AT+HEARTINFONEW

Function： configure/inquire heartbeat packet data

Format： inquire

transmit：AT+ HEARTINFONEW<CR>

return：<CR><LF>+OK=<type>,<data><CR><LF>

configure

transmit：AT+ HEARTINFO=<type>,<data><CR>

return：<CR><LF>+OK<CR><LF>

parameter：type

0 Heartbeat package type is HEX

1 Heartbeat type is ASCII code

data

ASCII code within 40 bytes, when the heartbeat packet type is HEX, the content must be a legal HEX format and the length must be an even number.

AT+HEARTM

Function： configure/inquire heartbeat package time

Format： inquire

transmit：AT+ HEARTM <CR>

return：<CR><LF>+OK=<time><CR><LF>

4G/LTE Serial Server E840-DTU（4G-01）User Manual

configure

transmit：AT+ HEARTM =<time><CR>

return：<CR><LF>+OK<CR><LF>

Parameters: time heartbeat time, 0 off, range 1 to 65535 seconds.AT+SHORTM

Function： set/inquire short connection time

Format： inquire

transmit：AT+ SHORTM<CR>

return：<CR><LF>+OK=<time><CR><LF>

configure

transmit：AT+ SHORTM=<time><CR>

return：<CR><LF>+OK<CR><LF>

parameter： time short connection time， 0 off，from 2-255 second

AT+EBTIOT

Function： set /inquire EBYTE IoT Cloud platform

Format： inquire

transmit：AT+EBTIOT <CR>

return：<CR><LF>+OK=<ctrl><CR><LF>

configure

transmit：AT+EBTIOT =<ctrl><CR>

return：<CR><LF>+OK<CR><LF>

parameter： ctrl EBYTE IoT function switch，0 off/1 on

Note: After the IoT cloud function is enabled, the module is automatically connected to the Yiyi special IoT platform, ignoring the sock configuration,

registration package, and heartbeat package function.AT+CSQ

Function： inquire signal strength

Format： configure

transmit AT+CSQ<CR><LF>

return <CR><LF>+OK=<csq><CR><LF>

parameter： csq signal strength

description：none

AT+CREG

Function： inquire whether it is registered with the carrier.

Format： configure

transmit AT+CREG<CR><LF>

return <CR><LF>+OK=<creg><CR><LF>

Parameter： creg

1 Register to the network

0 not registered to the network1

Description： None

AT+CPIN

Function： inquire SIM card status

Format： configure

transmit AT+CPIN<CR><LF>

return <CR><LF>+OK=<cpin><CR><LF>

Parameter： cpin

1 Able to detect SIM card

0 unable to detect SIM card

Description： None

AT+ POTOCOL

4G/LTE Serial Server E840-DTU（4G-01）User Manual

Function： Set/inquire Whether to enable protocol transmission (valid under 4G multi socket)

Format： inquire

transmit：AT+ POTOCOL <CR>

return：<CR><LF>+OK=<sta><CR><LF>

configure

transmit：AT+ POTOCOL =<data><CR>

return：<CR><LF>+OK<CR><LF>

Parameters: data status

ON turns on the EBYTE transmission of the protocol

OFF Turns on the EBYTE transparent transmission

5. Notes

1. The first Socket of this module will always be opened. After the initialization is successful, it will automatically establish a connection with the configured

network network server. After the first connection is successful, the NET light will be on. If the NET light has been flashing slowly, the module is initialized

successfully. However, it has not been able to establish a connection with the server. In this case, please check whether the module network server

parameter configuration is correct.

2. The module Socket1, Socket2, and Socket3 do not have a connection indicator. The user can check the corresponding Socket connection status

through the AT+LINKSTAx command.

3. After the module is powered on, it cannot be initialized successfully. That is, after waiting for a short time, the NET light flashes quickly. At this time,

check whether the module is installed normally, whether the SIM card is normally inserted, whether the SIM has failed, and whether the module radio

antenna is properly connected.

4. 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 (AT+SHORTM>2), the module will actively disconnect the connection when the network or serial port has no data duration exceeding the short

connection setting period. After the disconnection, the network cannot send data, and the local serial port sends For valid data, the module will

immediately establish a connection with the server. If the local clear cache function is turned off, the data packet will be cached (up to 128 bytes). After

the connection is successful, the data will be sent to the server. The local cache function is cleared and the packet will be discarded.

5. The heartbeat function is used to maintain the connection after the module and the server successfully establish a connection. In the network, if the

client and the network server successfully establish a connection and there is no data transmission for a long time, the Socket link may appear “dead”

phenomenon, that is, The link exists but cannot send or receive data. Therefore, in actual use, it is recommended to enable the heartbeat packet function

to ensure the reliability of the network link.

6. In actual use, it is normal for the data delay of the two communications to be different.

7. The maximum single packet length supported by a single link in this module is 1024 bytes. A local serial port or a network sending a packet exceeding

this length in a single transmission may cause a packet abnormality.

6. Important Statement