Ebyte E840-DTU User manual

!
"!
!
!
!
E840-DTU（GPRS-01）
! !
!
!
!
!
!
!
!
!
!
!
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.
!
!
User Manual

!
#!
!
!
Version
Date
Description
Issued by
1.00
2017/12/6
Initial version
huaa
!
!
!
!
!
!
!
E840-DTU (GPRS-01) is designed for the communication between UART and net server via GPRS. With easy AT setting, the dual
transparent transmission can be conducted.
This chapter focuses on the brief introduction of E840-DTU (GPRS-01). It explains how to make the simplest hardware environment
and test the transparent transmission of E840-DTU (GPRS-01). The transparent transmission is between UART devices（referring to PC）
and net sever (replaced by TCP testing tools).
Features
l Quad-frequency: GSM850/900, DCS1800/1900, applied globally
l GSM/GPRS/EDGE and the 2G data of China Unicom and China mobile2G/3G/4G SIM card
l TCP and UDP transmission protocols
l Remote SMS parameter config
l UART AT command setting
l Simple commands are sent in Chinese or English via SMS which avoids the complication of Chinese message of PDU.
l Wide voltage band of 8-28V. Power supply of DC and terminal.
l RS485 circuit board features electric isolation, lightning protection, surge protection and anti-interference.
!
!
!
!
! !

!
$!
!
Content
1.!Introduction ...................................................................................................................................................................... 5!
1.1 Brief Introduction .................................................................................................................................................................................. 5!
1.2 Parameters .............................................................................................................................................................................................. 5!
1.3 Interface Description ............................................................................................................................................................................. 6!
1.4 Pin Definition .......................................................................................................................................................................................... 7!
2.!Test Introduction .............................................................................................................................................................. 7!
2.1 Devices Preparation ............................................................................................................................................................................... 7!
2.2 Data Transmitting Test .......................................................................................................................................................................... 8!
2.2.1 Test Procedures ............................................................................................................................................................................................................. 8!
3.!AT Parameter Setting ..................................................................................................................................................... 10!
3.1 Parameter Setting Preparation .......................................................................................................................................................... 10!
3.2 AT Commands Introduction ............................................................................................................................................................... 10!
3.2.1 AT+UARTCFG: Baud Rate Configuration ........................................................................................................................................................... 10!
3.2.2 AT+DSCADDR: Net Server Parameter Configuration ................................................................................................................................... 10!
3.2.3 AT+DTUID: Transceiver Configuration ID .......................................................................................................................................................... 11!
3.2.4 AT+KEEPALIVE: Keepalive and Interval .............................................................................................................................................................. 11!
3.2.5 AT+ACKTIME: Responding Time Configuration ............................................................................................................................................. 12!
3.2.6 AT+DTUPACKET: Configure Packing Time and Length of Data ................................................................................................................. 12!
3.2.7 AT&W: Save Configuration .................................................................................................................................................................................... 12!
3.2.8 AT+CFUN=1,1: Transceiver Restart ..................................................................................................................................................................... 12!
3.2.9 AT+DEBUGMODE Debug Mode .......................................................................................................................................................................... 12!
3.2.1.0 AT+DTUFILTER Filter Configuration ................................................................................................................................................................. 13!
3.2.11 AT+CSTT APN Configuration .............................................................................................................................................................................. 13!
3.2.12 AT+RELINKTIME Relink Time .............................................................................................................................................................................. 13!
3.2.13 AT+DSCTIME Server Connection Timeout ..................................................................................................................................................... 14!
3.2.14AT+DTUALL? Get Parameters ............................................................................................................................................................................... 14!
4.!Remote Parameter Configuration ................................................................................................................................ 14!
4.1 Introduction .......................................................................................................................................................................................... 14!
4.1.1 @DTU:0000:CGMR? Software Version ............................................................................................................................................................... 15!
4.1.3 @DTU:0000:DSCADDR:0,TCP,218.242.43.254,108 .......................................................................................................................................... 15!
Net Server Parameter configuration ............................................................................................................................................................................. 15!
4.1.4 @DTU:0000:DTUID:1,0,31654646494777 Transceiver ID ............................................................................................................................. 15!
4.1.5 @DTU:0000:KEEPALIVE:10,5,3000,5,0,kingcom ............................................................................................................................................... 16!
Keepalive Interval Configuration .................................................................................................................................................................................... 16!
4.1.6 @DTU:0000:UARTCFG:9600,1,0,0 UART Baud Rate Configuration ........................................................................................................... 16!
4.1.7 @DTU:0000:POWEROFF Transceiver Restart ................................................................................................................................................... 17!
4.1.8 @DTU:0000:DEBUGMODE:0 Debug Mode ....................................................................................................................................................... 17!
4.1.9 @DTU:0000:DTUFILTER:0 Filter Configuration ................................................................................................................................................ 17!
4.1.10 @DTU:0000:RELINKTIME:60 Relink Interval Configuration ...................................................................................................................... 18!
4.1.12 @DTU:0000:DSCTIME:60 Connection Timeout Configuration ................................................................................................................ 18!
4.1.13 @DTU:MMCZ Password Reset Configuration ............................................................................................................................................... 19!
4.1.14 @DTU:0000:DTUALL? Get Parameters ............................................................................................................................................................. 19!
4.1.15 @DTU:0000:CSTT? Get APN ................................................................................................................................................................................ 19!
4.1.16 @DTU:0000:CSQ? Get Signal Quality ............................................................................................................................................................... 19!
4.1.17 @DTU:0000:GPS? Get Location .......................................................................................................................................................................... 19!
4.1.18 @DTU:0000:AT&F Reset ....................................................................................................................................................................................... 20!
5.!SMS .................................................................................................................................................................................. 20!
6.!NET Indicator Introduction ........................................................................................................................................... 20!
7.!Notes ................................................................................................................................................................................ 20!

!
%!
7.1 Notes for Powering on ........................................................................................................................................................................ 20!
7.2 Internet Connection ............................................................................................................................................................................. 21!
7.2.1 Wi-Fi Connection ....................................................................................................................................................................................................... 21!
7.2.2 Connection Failure .................................................................................................................................................................................................... 21!
7.2.3 Easy Disconnection ................................................................................................................................................................................................... 21!
7.3 Description of Connection failure ...................................................................................................................................................... 21!
8.!Important Statement ..................................................................................................................................................... 22!
9.!About Us .......................................................................................................................................................................... 22!
!

!
&!
1. Introduction
1.1 Brief Introduction
E840-DTU (GPRS-01) is a wireless data transceiver of Ebyte. It features a certain scope of applications which cover most common
application scenarios. It supports definable ConnReg and keepalive.
E840-DTU (GPRS-01) 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
RF Parameter
Wireless Standard
GSM/GPRS/EDGE
Standard Frequency
850/900/1800/1900MHz
Transmission Power
GSM900 class4（2W）, DCS1800 class1（1W）
GPRS Terminal Class Device
Class B
GPRS Multi-slot Class
GPRS Class 10
GPRS Coding Schemes
CS1 ~ CS4
Hardware Features
Antenna Interface
SMA
Data Interface
RS485 /RS232
Baud Rate
2400bps - 115200bps
Working Voltage
DC 5V~36V
Working Current
59mA~65mA(12V)
Working Temperature
-40℃- 70℃
Storage Temperature
-40℃- 85℃
Size
82×84×24mm
RS485 /RS232
Electric isolation, RS485/RS232
Firmware Features
Wi-Fi
GSM/GPRS/EDGE
Mode
Transparent Transmission
Command Setting
Local AT command, remote configuration command
Net Protocols
TCP /UDP
Heat Beat Packet
Configurable heat beat cycle and content
Device ID
Configurable Device ID(ConnReg)
Configurable Responding Time
Configurable sever responding time
Configurable Reconnection Gap
Configurable reconnection gap
DNS
Yes

!
'!
1.3 Interface Description
!
!
!
!
!

!
(!
1.4 Pin Definition
)*+!,-.!
,/01!
21345*67*8+
1
GND
Ground electrode
2
VCC
Power supply 8V-28V DC
3
RS232
RS232 communication interface
4
485_A
Side A of eternal interface for other RS485 devices
5
485_B
Side A of eternal interface for other RS485 devices
6
ANT
SMA-K，50Ω
7
PWR
Power indicator
8
WORK
UART communication indicator(different color for transmitting and receiving)
9
NEL
Net working indicator
10
RST
Reset switch(powered off when pulled down)
11
BAUD
UART baud rate reset switch（Reset after pulled down）
12
DC8~28V
Power adaptor interface
13
SIM
SIM card slot
2. Test Introduction
2.1 Devices Preparation
E840-DTU（GPRS-01）
12V power adaptor
USB to RS485 adaptor or USB to RS232 adaptor
GPRS sucker antenna
!
Please get UART, SIM card, sucker antenna and etc. ready according to the recommended circuit before test.

!
9!
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$Test$Procedures$
Insert the SIM card into E840-DTU (GPRS-01) and connect it to the computer according to the mentioned methods. Open the Xcom,
set the parameters of corresponding UART NO. and baud rate and turn on the UART. (China Telecom SIM card is not compatible.)
When powered on with the power adaptor provided by us, POWER indicator on and NET indicator blinking shows that the
transceiver is ready. More details for the indicator, please refer to the following chapters.
Direct access to the module with the UART AT command.
Classic application:
Transparent transmission between DTU and net server
Default parameter of the transceiver is 115200, 8N, 1. Once powered on, the transceiver will output the following message:
AT Ready
AST_POWERON
The output indicates that the transceiver is working properly. Users can input the following AT command to configure the parameters.
AT+DSCADDR=0,"TCP","139.199.157.166",8788 //Configure the connection IP address and port of the transceiver. Company IP address
and ports are applied, and users can apply their own ones.
AT&W //Maintain the parameter
AT+CFUN=1,1 // Restart
AT+SCID //Check if the SIM card is inserted properly. If so, it shows the identical heading code of the SIM code.
AT+CSQ // Check the signal intensity. If it returns CSQ:0, 0 here means no signal.
AT+CREG? //Check the GPRS CREG
（For more details about the AT commands, please refer to the following chapters.）
When transceiver shows CONNECT OK, it indicates that TCP is connected successfully, which is shown as follow:

!
:!
Parameter Configuration
Transparent transmission with net testing tool

!
";!
3. AT Parameter Setting
3.1 Parameter Setting Preparation
This transceiver features auto connection once powered on. It will output “CONNECT OK” if the transceiver is connected
successfully and the transparent transmission mode is on. Users need to input +++ (\n) to switch to the configuration mode and to input
ATO to switch back to the transmission mode. If the connection is failed, the transceiver is at the configuration mode and can be
configured.
3.2 AT Commands Introduction
l The following AT commands are recommended to be capital.
l At local configuration, every AT commands should end with <CR>.
l Once the command is configured successfully, it shows “OK”.
l After all the following commands are configured, question mark(?)can be applied to check the current configuration, like
AT+UARTCFG?.
l Restart is needed to activate the commands configuration.
3.2.1$AT+UARTCFG:$Baud$Rate$Configuration$ $
AT+UARTCFG=Baud rate, data length, parity control, checkout, stop bit length.
l Baud rate: 115200， 57600， 38400， 19200， 14400， 9600， 4800， 2400;
l Data length: BIT configuration of every byte. 0 (7byte), 1(8byte)；
l Parity checkout: Check if there is parity in the configuration. 0(No parity), 1(odd parity), 2(even parity), 3(0 parity), 4(1 parity)
l Stop bit length: 0(1 byte), 1(2 byte)
If pulled down when the transceiver is powered on, it is defaulted as 115200,1,0,0.
For example:
Configuration: AT+UARTCFG=115200,1,0,0
Return: OK
Checkout: AT+UARTCFG?
Return: +UARTCFG: 115200,1,0,0 OK
Configuration(default): AT+UARTCFG=115200,1,0,0
3.2.2$AT+DSCADDR:$Net$Server$Parameter$Configuration$ $
AT+DSCADDR=0,"TCP","139.199.157.166",80
AT+DSCADDR=1,"UDP","www.cdebyte,com",80
l Primary and sub center: 0 represents primary center, 1 represents sub center. It’s defaulted to connect with the primary center and
then connect to sub center if the primary center connection failed. The trail of connection between these two keeps going. The two
centers will be configured as primary center if no sub center.
l TCP/UDP option: It supports TCP and UDP. The current one is based on the last configuration and sever communication protocols.
l SERVER IP address：It’s the address of server which conducts TCP/IP communication with the transceiver. Both IP address and
domain name are acceptable. The transceiver features DNS.
l Port NO.: 1-65535. It’s the port configuration of the server which conducts communication with the transceiver. The transceiver will
send IP data packet to certain port.
Server parameter(default)
For example:
Config: AT+DSCADDR=0,"UDP","218.242.43.254",108
Return: OK
Config: AT+DSCADDR=1,"TCP","218.242.43.254",108