User manual

TPC-1071H/1271H/1571H/1771H User Manual 52

A.3.2 COM3/ COM6(Option): RS-422/ 485

The serial port COM3 and COM6(Option) on the TPC-1x71H series are adjustable by BIOS. It

can be set to RS-422 or RS-485 mode. This port is designed with auto data flow control capa-

bility. In other word, the TPC-1x71H series can automatically detect the data flow direction at

this port when the two wired RS-485 communication is activated.

A.3.2.1 Pin Definition

A.3.2.2 RS-422/ 485 mode setting by BIOS

1. Enter into BIOS setup utility

Signal

RS-422 RS-485

1TX- D-

2TX+ D+

3RX- -

4RX+ -

5GND GND

6- -

7- -

8- -

9- -