Ebyte E840-DTU User manual

NB-IoT Serial Server
E840-DTU（NB-02）
User Manual
This manual may be modified based on product upgrade, please refer to the latest version.
All rights to interpret and modify this manual belong to Chengdu Ebyte Electronic Technology Co., Ltd.

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
Version
Date
Description
Issued by
1.00
2018/03/07
Initial version
huaa
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.

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd. 2
Contents
FEATURES......................................................................................................................................................................................... 1
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............................................................................................................................................................................... 5
2.1 DEVICE PREPARATION.............................................................................................................................................................. 5
2.2 DATA TRANSMITTING TEST.......................................................................................................................................................6
3. IMPORTANT STATEMENT........................................................................................................................................................7
4. ABOUT US.................................................................................................................................................................................... 7

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，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

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd. 4
1.3 Interface Description

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd. 5
1.4 Pin Definition
Pin No.
Name
Description
1
GND
Ground electrode
2
VCC
Power supply，default: 8~28V
3
RS232
RS232 interface
4
485_A
Side A of external interface for other RS485 devices
5
485_B
Side B of external interface for other RS485 devices
6
ANT
Antenna interface（SMA-K，50Ω）
7
PWR
Power indicator
8
WORK
UART communication indicator
9
NEL
Net working indicator
10
NC
N/A
11
RST
Reset dial switch（down，reset）
12
DC8~28V
Power adapter interface
13
SIM
SIM card slot
2. Quick Start
2.1 Device Preparation
E840-DTU(NB-02)
12V Power adaptor

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd. 6
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.
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

NB-IoT DTU E840-DTU（NB-02）User Manual
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co.,Ltd. 7
+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.
3. 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.
4. About Us
CDEBYTE after-sales technical support：[email protected]
For file download and more product information, please visit：www.cdebyte.com
Thank you for using the CDEBYTE 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