Table C-19: COM2 port for RS-232, RS-422 and RS-485 (CN20)

Pin

Signal

 

 

 

RS-232

RS-422

RS-485

11

DCD2

TX-

DATA-

 

 

 

 

13

RxD2

TX+

DATA+

 

 

 

 

15

TxD2

RX+

NC

 

 

 

 

17

DTR2

RX-

NC

 

 

 

 

19

GND

GND

GND

 

 

 

 

12

DSR2

DSR2 (not used)

DSR2 (not used)

 

 

 

 

14

RTS2

RTS2 (not used)

DSR2 (not used)

 

 

 

 

16

CTS2

CTS2 (not used)

DSR2 (not used)

 

 

 

 

18

RI2

RI2 (not used)

DSR2 (not used)

 

 

 

 

Appendix C Pin Assignments

101

Page 113
Image 113
Advantech 2006957006 5th Edition user manual Pin Signal RS-232 RS-422 RS-485