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.

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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

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1.3 Interface Description

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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)

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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.

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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.

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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

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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

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transmission mode.
AT+RESTORE
Function: Restore factory settings.
Format: Set
Send: AT+RESTORE<CR><LF>
Return: <CR><LF>+OK<CR><LF>
Para: None
Note: None
AT+UART
Function: Set/Query UART parameters.
Format: Query
Send: AT+UART<CR>
Return: <CR><LF>+OK=<baudrate>,< parity ><CR><LF>
Set
Send: AT+UART=<baudrate>,< parity ><CR><LF>
Return: <CR><LF>+OK<CR><LF>
Para: baudrate, can be configured to: 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600.
Parity Parity bit NON
E No Check EVEN Even check ODD Odd check
Note: None
AT+UARTCLR
Function: Set/Query whether to clear the serial port cache before connecting.
Format: Query
Send: AT+ UARTCLR <CR>
Return: <CR><LF>+OK=< sta ><CR><LF>
Set
Send: AT+ UARTCLR =< sta ><CR>
Return: <CR><LF>+OK<CR><LF>
Para: sta status
ON Clear the serial port cache before connecting
OFF Don’t clear the serial port cache before connecting
AT+MAC
Function: Query device MAC.
Format: Query
Send: AT+MAC<CR>
Return: <CR><LF>+OK=<mac><CR><LF>
Para: mac Device MAC address
AT+IMEI

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Function: Query device IMEI.
Format: Query
Send: AT+IMEI<CR>
Return: <CR><LF>+OK=<imei><CR><LF>
Para: imei Device IMEI code
AT+SN
Function: Set/Query SN.
Format: Query
Send: AT+SN<CR>
Return: <CR><LF>+OK=<sn><CR><LF>
Set
Send: AT+SN=<sn><CR>
Return: <CR><LF>+OK<CR><LF>
AT+LINKSTA
Function: Query whether the TCP link has been established.
Format: Query
Send: AT+LINKSTA<CR>
Return: <CR><LF>+OK=<sta><CR><LF>
Para: Sta Connect(TCP Connected) / Disconnect(TCP Disconnected)
AT+SOCK
Function: Set/Query network protocol parameter format.
Format: Query
Send: AT+SOCK<CR>
Return: <CR><LF>+OK=<protocol>,<ip>,< port ><CR><LF>
Set
Send: AT+SOCK=<protocol>,<ip>,< port ><CR>
Return: <CR><LF>+OK<CR><LF>
Para: protocol TCPC / UDPC
TCPC: TCP client
UDPC: UDP client
ip The IP address or domain name of the target server
port Server port number, in decimal, less than 65535.
AT+REGMOD
Function: Set/Query registration packet mechanism.
Format: Query
Send: AT+REGMOD<CR>
Return: <CR><LF>+OK=<status><CR><LF>
Set
Send: AT+REGMOD =<status><CR>
Return: <CR><LF>+OK<CR><LF>

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Para: status Registration packet mechanism
EMBMAC Add MAC/IMEI as registration packet data before each packet sent to the server
EMBCSTM Add user registration packet data before each packet sent to the server
OLMAC Send a MAC/IMEI registration packet only when connecting to the server at the first
time
OLCSTM Send a user registration packet only when connecting to the server at the first time
OFF Registration packet mechanism off
AT+REGINFO
Function: Set/Query the contents of the user registration packet.
Format: Query
Send: AT+ REGINFO <CR>
Return: <CR><LF>+OK=<data><CR><LF>
Set
Send: AT+ REGINFO =<data><CR>
Return: <CR><LF>+OK<CR><LF>
Para: data Less than 40 bytes ASCII code
AT+REGINFONEW
Function: Set/Query the contents of the user registration packet.
Format: Query
Send: AT+ REGINFONEW<CR>
Return: <CR><LF>+OK=<type>,<data><CR><LF>
Set
Send: AT+ REGINFONEW =<type>,<data><CR>
Return: <CR><LF>+OK<CR><LF>
Para: type
0 registration packet is HEX
1 registration packet is ASCII code
data
Less than 40 bytes ASCII code, 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/Query heartbeat packet mode.
Format: Query
Send: AT+ HEARTMOD<CR>
Return: <CR><LF>+OK=<mode><CR><LF>
Set
Send: AT+ HEARTMOD=<mode><CR>
Return: <CR><LF>+OK<CR><LF>
Para: mode
NET Network heartbeat packet
UART UART heartbeat packet

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AT+HEARTINFO
Function: Set/Query heartbeat packet data.
Format: Query
Send: AT+ HEARTINFO<CR>
Return: <CR><LF>+OK=<data><CR><LF>
Set
Send:AT+ HEARTINFO=<data><CR>
Return: <CR><LF>+OK<CR><LF>
Para: data Less than 40 bytes ASCII code
AT+HEARTINFONEW
Function: Set/Query heartbeat packet data.
Format: Query
Send: AT+ HEARTINFONEW<CR>
Return: <CR><LF>+OK=<type>,<data><CR><LF>
Set
Send: AT+ HEARTINFO=<type>,<data><CR>
Return: <CR><LF>+OK<CR><LF>
Para: type
0 Heartbeat packet data is HEX
1 Heartbeat packet data is ASCII code
data
Less than 40 bytes ASCII code, 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+HEARTM
Function: Set/Query heartbeat packet time.
Format: Query
Send: AT+ HEARTM <CR>
Return: <CR><LF>+OK=<time><CR><LF>
Set
Send: AT+ HEARTM =<time><CR>
Return: <CR><LF>+OK<CR><LF>
Para: time
Heartbeat time 0 OFF, range 1～65535 seconds
AT+SHORTM
Function: Set/Query short connection time.
Format: Query
Send: AT+ SHORTM<CR>
Return: <CR><LF>+OK=<time><CR><LF>
Set
Send: AT+ SHORTM=<time><CR>

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Return: <CR><LF>+OK<CR><LF>
Para: time
Short connection time 0 OFF, range 2～65535 seconds
AT+ CDEBYTEIOT
Function: Set/Query the IP and port address of the Ebyte IoT cloud platform.
Format: Query
Send: AT+ CDEBYTEIOT<CR>
Return: <CR><LF>+OK=<ip>,<port><CR><LF>
Set
Send: AT+ CDEBYTEIOT=<ip>,<port><CR>
Return: <CR><LF>+OK<CR><LF>
AT+EBTIOT
Function: Set/Query Ebyte IoT platform.
Format: Query
Send: AT+EBTIOT <CR>
Return: <CR><LF>+OK=<ctrl><CR><LF>
Set
Send: AT+EBTIOT =<ctrl><CR>
Return: <CR><LF>+OK<CR><LF>
Para: ctrl Ebyte IoT platform switch ON Turn on / OFF Turn off
Note: After the IoT cloud function is enabled, the device is automatically connected to the Ebyte IoT platform,
ignoring the sock configuration and registration packet, heartbeat packet function.
AT+CSQ
Function: Query signal strength.
Format: Query
Send: AT+CSQ<CR><LF>
Return: <CR><LF>+OK=<csq><CR><LF>
Para: csq signal strength
Note: None
AT+CREG
Function: Query whether to register to the operator network.
Format: Query
Send: AT+CREG<CR><LF>
Return: <CR><LF>+OK=<creg><CR><LF>
Para: creg
1 Registered to the network
0 Not registered to the network
Note: None
AT+CPIN

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Function: Query SIM card status.
Format: Query
Send: AT+CPIN<CR><LF>
Return: <CR><LF>+OK=<cpin><CR><LF>
Para: cpin
1 SIM card detected
0 No SIM card detected
Note: None
AT+LBS
Function: Query LAC & CID code.
Format: Query
Send: AT+LBS<CR><LF>
Return: <CR><LF>+OK=<lac><cid><CR><LF>
AT+RSTIME
Function: Set/Query reset time.
Format: Query
Send: AT+RSTIME<CR><LF>
Return: <CR><LF>+OK=<rstime><CR><LF>
Set
Send: AT+RSTIME=<rstime><CR><LF>
Return: <CR><LF>+OK<CR><LF>

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4. Notes
1. The Socket link of this device will always be opened. After the initialization is successful, it will automatically
establish a connection with the configured network server.
2. After the device is powered on, it cannot be initialized successfully. That is, the "state" indicator has no indication for
more than 30 seconds. In this case, check whether the module is installed properly, whether the SIM card is properly
inserted, and whether the SIM has been invalid.
3. The short connection feature can be used to reduce the connection pressure of multiple devices to the server. After the
short connection function is enabled (AT+SHORTM>2), when the network or serial port has no data for more than the
short connection setting cycle, the device will actively disconnect the connection. After disconnection, the network
cannot send data. When the serial port sends valid data, the device will immediately establish a connection with the
server. If the local clear cache function is turned off, the current packet will be cached (up to 10K bytes). After the
connection is successful, the data will be sent to the server. If the clear local cache function is enabled, the packet will be
discarded.
4. The heartbeat function is used to maintain the state after the device and the server are successfully connected. Because
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 be “dead”, 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.
5. In actual use, it is normal that there is different data delay of two communications.
6. When the device serial port outputs the words "pdp error, device will be reset!", it indicates that the PDP context is
disabled by the network. Maybe the SIM card is loose or the current network channel is occupied abnormally.
5. Important Statement
1. Ebyte reserves the right of final interpretation and modification of all the contents of this manual.
2. As the hardware and software products continuously improving, this manual may subject to change without notice,
please refer to the latest version.
3. Everyone is responsible for protecting the environment: to reduce the use of paper, we only provide electronic
documents of the English manual, if necessary, please go to our official website to download.

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6. About Us
Ebyte after-sales technical support：[e-mail]
For file download and more product information, please visit：www.ebyte.com
Thank you for using the Ebyte products! Any questions or suggestions, please contact：[e-mail]
————————————————————————————————————————————————
Tel：[phone]
Fax：[phone]
Website：www.cdebyte.com/en/
Address：Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China