Chengdu Ebyte Electronic Technology Co. Ltd E840-DTU(4G-02)User Manual
Copyright
©
2012
–
2019,Chengdu Ebyte Electronic Technology Co. LTD.
6
1.5 Pin definition
Pin No.
Name
Description
1
RS232
RS232
2
485_A
Connect to port A of other RS485 devices
3
485_B
Connect to port B of other RS485 devices
4
GND
Ground
5
VCC
Power supply
，
range: 8~28V
6
PWR
Power indicator
7
WORK
Blue: Data receiving and transmitting indicator, when the network receives data or the
serial port receives data (50ms high/10ms low)
Green: device status indicator,
Low: The device is powered on to search for SIM card
1800ms low, 200ms high: the device checks the correct SIM card and is
attaching to the network;
High: The device is attached to the network successfully.
8
NET
Green: SocketA link connection status indication pin
High: SocketA is successfully connected to the web server;
Low: SocketA did not successfully connect to the network server;
Blue: SocketB link connection status indication pin
High: SocketB is successfully connected to the web server;
Low: SocketB did not successfully connect to the network server;
9
DC8~28V
For power adaptor
，
range: 8~28V
10
RST
Reset switch
（
downward
，
reset
）
11
Restore
Operating dip switch
Once power on,let DTU switch top-down for 3~10S
，
and bottom-up
，
then DTU
enters factory setting and restart immediately
12
SIM
SIM
13
ANT
Antenna
（
SMA-K
，
50Ω impedance match
）
