USR IOT USR-N540 - DB9 Pin Definition; DB9 Pin-Board

USR-N540 User Manual www.usriot.com
Jinan USR IOT Technology Limited 12 / 73 inquiry@usriot.com
2.6. DB9 Pin Definition
 For RS232 port, pin definition is as below
 For RS485 port, pin 3 works as “B(-)”, Pin 7 works as “A+”
 For RS422 port
2.7. DB9 Pin-board
We provide DB9 pin-board for user to use terminal connection.
Pin
Definition
2
RXD, pin of receives data
3
TXD
5
GND
7
RTS
8
CTS
Pin
Definition
2
RX+, pin of receives data
3
TX-
5
GND
7
TX+
8
RX-