GPRS DTU User Manual V1.3
http://en.usr.cn
Jinan USR IOT Technology Limited
Page 7 of 31
index
name
description
1
PWR
On once power is on
2
NET
State Module function:
Off Module is not running;
64ms On/800ms Off Module does not find the network;
64ms On/3000ms Off Module find the network;
64ms On/300ms Off GPRS communication;
3
DATA
When TCP link is established, it will on
2.6.Serial Port Instruction
2.6.1. RS232 Definition
RS232 port use 9 pin, female hole. Only three lines are defined, the rest is empty.
Diagram 2-2 RS232 interfaces
ID
Indicia
Function
Instruction
2
TXD
Device data transmit
RS232 level
3
RXD
Device data receive
RS232 level
5
GND
Ground
Communication
common place
Diagram 2-3 RS232 Pin description
In order to debug easily, serial cable will be supplied for customer to connected with PC
directly.
