Ebyte E840-DTU User manual

Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
NB-IoT Serial Server
E840-DTU（NB-02）

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
1
Features...................................................................................................................................................................................2
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
2.2.1 Test Steps:.................................................................................................................................................... 7
Revision history......................................................................................................................................................................8
Important Statement............................................................................................................................................................... 8
About us.................................................................................................................................................................................8

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
2
E840-DTU(NB-02) 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-02). It explains how to make the simplest hardware
environment and test the transparent transmission of E840-DTU(NB-02). The transparent transmission is between UART
devices（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 (Downward)
Support multiple network protocol, such as CoAP，UDP，IPv4 ,LwM2M etc.
Support 3GPP TS 27.007 V14.3.0 (2017-03) and Quectel intensified AT command.
Support 8-28V 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-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
3
1. Introduction
1.1 Brief Introduction
E840-DTU(NB-02) 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-02) supports DC and RS485 terminal power supply. Its voltage ranges from 8.0 to 28.0V. 5.0V
works too. 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
Value
Description
Frequency
Band 5
Receiving Frequency：869MHz~894MHz
Transmitting Frequency：824MHz~849MHz
Hardware features
Antenna Type
SMA
Data Interface
RS485 /RS232
Baud Rate
9600bps
Maximum transmitting power
23dBm±2dB
Sensitivity
-129dBm±1dB
Dissipative Flows（typical
value）：
Power-saving mode（PSM）： 3.6uA
Idle Mode（Idle）： 2mA @DRX=1.28s
Working Voltage
DC ８V~２８V
Working Temperature
-40℃- 70℃
Storage Temperature
-40℃- 85℃
Size
82×84×24mm
RS485 /RS232
Electrical isolation, and with RS485/RS232
Software features
Wireless rate
Single Tone，Sub-carrier 15kHz and 3.75kHz：21.25kbps (downward)，
15.625kbps (upstream)
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 intensified AT command
Network protocol
Support multiple protocol, such as CoAP，UDP，IPv4 ,LwM2M etc.
Device ID
Users can configure the device ID via AT command

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
4
1.3 Interface Description

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
5
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: 8~28V
6
PWR
Power indicator
7
WORK
UART communication indicator
8
NET
Net working indicator
9
DC-IN
Power adapter interface
10
RST
Reset dial switch（down，reset）
11
ON/OFF
N/A
12
SIM
SIM card slot
13
ANT
Antenna interface（SMA-K，50Ω）

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
6
2. Quick Start
2.1 Device Preparation
E840-DTU(NB-02)
12V Power adaptor
USB to RS485 adaptor or USB to RS232 adaptor
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-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
7
2.2.1 Test Steps:
1. Insert the SIM card into E840-DTU(NB-02) and connect it to the computer according to the above mentioned
methods. Open the Xcom, set the parameters of corresponding UART NO. and baud rate(only 9600 is available)and
turn on the UART.
2. When powered on with the power adaptor provided by us, POWER indicator on and NET indicator blinking
shows that the transceiver is ready.
3. Wait for 3s-5s to use the serial AT command to access the module.
4. Normal network process
Neul // Waiting 3s after module is powered on
OK
AT+CFUN=1 // configure cfun，“1” means open all the function of module
OK
AT+CIMI //Inquire IMSI——Delay 3s to inquire to ensure the module can
recognize the card.
460012345678966
OK
AT+NBAND?
+NBAND:5 // Read the current frequency, “5” means
850MHz;
OK
AT+NCDP=139.199.157.166,2017//configure CDP server
OK
AT+NCDP? //read the current CDP server
+NCDP:139.199.157.166,2017
OK
AT+CGATT=1 //register network
OK
AT+CSQ //read the current signal intensity +CSQ:21,99 ；
OK
AT+CGATT? // Inquire the network status-it takes times for module to join network. Query within
30s until it is 1, “1” means connection already.
+CGATT:1
OK
AT+CEREG? //Inquire network registration status, “1” means success;
+CEREG:0,1
OK
Note: Before the module joining the network, the IMSI of sim must be registered in the core network, or it cannot
register the network.

Chengdu Ebyte Electronic Technology Co,;Ltd E840-DTU(NB-02) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
8
Revision history
Version
Date
Description
Issued by
1.00
2018/03/07
Initial version
huaa
Important Statement
1. CDEBYTE 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.
About us
Technical support: [email protected]
Documents and RF Setting download link: www.ebyte.com
Thank you for using Ebyte products! Please contact us with any questions or suggestions: [email protected]
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Fax: [phone] ext. 821
Web: www.ebyte.com
Address: Innovation Center D347, 4# XI-XIN Road,Chengdu, Sichuan, China