Usr USR-GPRS232-701, User Manual

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GPRS DTU User Manual V1.3 http://en.usr.cn
Jinan USR IOT Technology Limited Page 8 of 31 tec@usr.cn
2.6.2. RS485 definition
Please inform us before order if you need RS485 version.
DB9 connector is the same as RS232 port on above photo. As to 6,9 pin of RS485,
following function:
ID Indicia Function Instruction
6 485-A A pin of RS485 RS485 level
9 485-B B pin of RS485 RS485 level
Diagram 2-4 RS485 pin description
As to RS485 equipment,we supply a DB9 pin connector and case for users make RS485
cables by themself.
2.6.3. TTL definition
Please inform us before order if you need TTL version.
DB9 connector is the same as RS232 port on above photo, use pin1, pin4 and pin9,
following function:
ID Indicia Function Instruction
1 RXD
Device data transmit RS232 level
4 TXD
Device data receive RS232 level
5 GND
Ground Communication common place
Diagram 2-5 TTL pin description
3. Parameter Configuration
3.1.Hardware Connection
Configuration
Before configuration, you need to connect DTU with PC by serial cable and power on.