Ebyte E840-DTU User manual

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
E840-DTU(NB-03) can realize the communication between serial port device and network server via NB network.
With simple AT command, users can easily use this product to achieve bidirectional transparent data transmission from
the serial port to the network.
This manual focuses on the brief introduction of E840-DTU(NB-03). It explains how to make the simplest hardware
environment and test the transparent transmission of E840-DTU(NB-03). The transparent transmission is between UART
device (referring to PC) and net sever (replaced by TCP testing tools).
Features
Based on NB-IOT communication standard, it can realize more 20dbi gain than GSM.
Support Single Tone, Sub-carrier 15kHz and 3.75kHz: 21.25kbps (Downlink), 15.625kbps(Uplink).
Support multiple network protocol, such as CoAP, UDP, IPv4, LwM2M etc.
Support 3GPP TS 27.007
V14.3.0 (2017-03) and
Quectel AT command.
Support 5-36V wide
voltage power supply, and
adopt DC and terminal as
the two power supply
methods.
RS485 circuit use the
electrical isolation,
lightning protection and
surge protection scheme, it
has anti-interference
ability.

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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Contents
1. Introduction........................................................................................................................................................................ 3
1.1 Brief Introduction...................................................................................................................................................... 3
1.2 Parameters................................................................................................................................................................. 3
1.3 Interface Description................................................................................................................................................. 4
1.4 Pin Definition............................................................................................................................................................ 5
2. Quick Start.......................................................................................................................................................................... 6
2.1 Device Preparation.................................................................................................................................................... 6
2.2 Data Transmitting Test..............................................................................................................................................6
3. AT Command..................................................................................................................................................................... 8
AT+REBT....................................................................................................................................................................... 9
AT+VER......................................................................................................................................................................... 9
AT+INFO........................................................................................................................................................................ 9
AT+EXAT.......................................................................................................................................................................9
AT+RESTORE..............................................................................................................................................................10
AT+UART.................................................................................................................................................................... 10
E No Check EVEN Even check ODD Odd check.................................................................................................. 10
AT+UARTCLR.............................................................................................................................................................10
AT+MAC...................................................................................................................................................................... 10
AT+IMEI.......................................................................................................................................................................10
AT+SN.......................................................................................................................................................................... 11
AT+LINKSTA.............................................................................................................................................................. 11
AT+SOCK.....................................................................................................................................................................11
AT+REGMOD.............................................................................................................................................................. 11
AT+REGINFO.............................................................................................................................................................. 12
AT+REGINFONEW..................................................................................................................................................... 12
1 registration packet is ASCII code............................................................................................................................12
AT+HEARTMOD.........................................................................................................................................................12
AT+HEARTINFO.........................................................................................................................................................13
AT+HEARTINFONEW................................................................................................................................................13
1 Heartbeat packet data is ASCII code.......................................................................................................................13
AT+HEARTM.............................................................................................................................................................. 13
AT+SHORTM...............................................................................................................................................................13
AT+ CDEBYTEIOT..................................................................................................................................................... 14
AT+EBTIOT................................................................................................................................................................. 14
AT+CSQ........................................................................................................................................................................14
AT+CREG.....................................................................................................................................................................14
1 Registered to the network........................................................................................................................................14
AT+CPIN...................................................................................................................................................................... 14
1 SIM card detected....................................................................................................................................................15
AT+LBS........................................................................................................................................................................ 15
AT+RSTIME.................................................................................................................................................................15
4. Notes.................................................................................................................................................................................16
5. Important Statement......................................................................................................................................................... 16

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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6. About Us...........................................................................................................................................................................17

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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1. Introduction
1.1 Brief Introduction
E840-DTU(NB-03) is a NB-IoT DTU produced by Ebyte. It features a certain scope of applications which cover
most common application scenarios. The user can realize bidirectional transparent data transmission from the serial port
to the network server by simple setting.
E840-DTU(NB-03) supports DC and terminal power supply. Its voltage ranges from 5V to 36V. RS232 and RS485
apply electric isolation which enables anti-interference. It is applicable in some environment with strong electromagnetic
interference like power sector.
1.2 Parameters
Item
Parameter
Description
Frequency
Band 5
Receiving Frequency: 869MHz~894MHz
Transmitting Frequency: 824MHz~849MHz
Hardware features
Antenna Type
SMA
Data Interface
RS485/RS232
Baud Rate
115200bps
Maximum transmitting power
23dBm±2dB
Sensitivity
-129dBm±1dB
Current consumption
(typical value)
Power-saving mode(PSM): 3.6uA
Idle Mode(Idle): 2mA @DRX=1.28s
Working Voltage
DC 5V-36V
Working Temperature
-40℃- 70℃
Storage Temperature
-40℃- 85℃
Size
82×84×24mm
RS485/RS232
With both RS485 and RS232, Electrical isolation, and
Software features
Wireless data rate
Single Tone, Sub-carrier 15kHz and 3.75kHz: 21.25kbps
(Downlink)，15.625kbps (Uplink)
Working Mode
Power-saving mode(PSM), Idle mode(Idle), Continuous
mode(Active)
Setting command
Abide by 3GPP TS 27.007 V14.3.0 and Quectel AT command
Network protocol
Support multiple protocol, such as CoAP, UDP, IPv4, LwM2M etc.
Device ID
Users can configure the device ID by AT command

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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1.3 Interface Description

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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1.4 Pin Definition
Pin No.
Name
Description
1
RS232
RS232 interface
2
485_A
Side A of external interface for other RS485 devices
3
485_B
Side B of external interface for other RS485 devices
4
GND
Ground electrode
5
VCC
Power supply，default: 5~36V
6
PWR
Power indicator
7
WORK
UART communication indicator
8
NET
Net working indicator
9
DC-IN
5V-36V
10
RST
Reset switch(downward, reset)
11
Restore
Restore factory settings switch(downward, 5-10S)
12
SIM
SIM card slot
13
ANT
Antenna interface(SMA-K, 50Ω)

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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2. Quick Start
2.1 Device Preparation
E840-DTU(NB-03)
12V Power adaptor
USB to RS485 or USB to RS232
NB-IoT sucker antenna
Please get UART, SIM card, sucker antenna and etc. ready according to the recommended circuit before test.
2.2 Data Transmitting Test
Software is needed for data transmitting test:
Xcom is applied here for the test and you can download it at our website. Users can also apply other test tools that
are available.

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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(1) Place the SIM card in the E840-DTU (NB-03) card slot and connect to the computer using the above connection
method. Open the COM debugging assistant software, select the corresponding COM port number, baud rate and
other parameters (115200 baud rate), and open the COM port.
(2) When the E840-DTU (NB-03) is powered on (please note that the reset pin is high), the POWER light is on to
indicate that the radio is working normally.
(3) E840-DTU (NB-03) has two working modes: network transparent transmission mode and cloud platform
working mode; the E840-DTU (NB-03) configuration tool can be used to configure the working mode, or it can be
configured by AT command.
(4) After the configuration is completed, you can do the test. Please note that the maximum data of a single packet in
the network transparent transmission mode is 486, the maximum data of a single packet of the cloud platform
working mode is 100, and the interval of sending data is no less than 5s.

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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3. AT Command
a) Command format: AT+<CMD>[op][ para1, para2, para3,…]<CR><LF>
AT+: Command prefix
CMD: Control command
[op]: “=” Parameter configuration
“NULL” Parameter query
[para-n]: List of parameters, can be omitted
<CR><LF>: Line Feed，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 not allowed
c) Command set:
Command
Description
REBT
Restart
VER
Query version number
INFO
Query device information
EXAT
Exit AT command mode
RESTORE
Restore factory settings
UART
Set/query serial port parameters
UARTCLR
Set/Query whether to clear the serial port cache before connecting
MAC
Query MAC address
IMEI
Query IMEI
SN
Set/query SN code
LINKSTA
Query the SOCK connection status
SOCK
Set/query SOCK parameters
REGMOD
Set/Query Registration Packet Mode
REGINFO
Set/Query User Registration Packet information (ASCII)
REGINFONEW
Set/Query User Registration Packet information (HEX)
HEARTMOD
Set/query heartbeat packet mode
HEARTINFO
Set/Query User Heartbeat Packet information (ASCII)
HEARTINFOEW
Set/Query User Heartbeat Packet information (HEX), Supporting index
HEARTM
Set/query heartbeat time
SHORTM
Set/query short connection time

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-03) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
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CDEBYTEIOT
Set/query the IP and port address of the Ebyte IoT cloud platform
EBTIOT
Set/query the Ebyte IoT cloud platform enable
CREG
Query whether to register to the network
CSQ
Query signal strength
CPIN
Query SIM card status
LBS
Query LAC & CID code
RSTIME
Set/query reset time
d) Command details:
AT+REBT
Function: Restart the device.
Format: Set
Send: AT+REBT<CR>
Return: <CR><LF>+OK<CR><LF>
Para: None
Note: After the command is executed correctly, the device restarts immediately and enters the transparent
transmission mode after restarting.
AT+VER
Function: Query firmware version.
Format: Set
Send: AT+VER<CR><LF>
Return: <CR><LF>+OK=<ver><CR><LF>
Para: ver firmware versin
Note: None
AT+INFO
Function: Query device type and version information
Format: Set
Send: AT+INFO<CR><LF>
Return: <CR><LF>+OK=<mod_name>,<hw_ver>,<sw_ver><CR><LF>
Para: mod_name Device name
hw_ver Hardware version
sw_ver Software version
Note: None
AT+EXAT
Function: Exit command mode and enter transparent transmission mode.
Format: Set
Send: AT+EXAT<CR><LF>
Return: <CR><LF>+OK<CR><LF>
Para: None
Note: After the command is executed correctly, the device switches from command mode to transparent