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Pin 5
GND
Pin 6
RTS- (A)
Pin 7
RTS+ (B)
Pin 8
CTS+ (B)
Pin 9
CTS- (A)
RS-422 Signal Wiring
•
Point-to-Point 4-Wire Full Duplex
USB-4COMi-M
RS-422 Device
2 TxD+ (B)
RxD+ (B)
1 TxD- (A)
RxD- (A)
3 RxD+ (B)
TxD+ (B)
4 RxD- (A)
TxD- (A)
5 GND
GND
•
RS-422 with Handshaking
USB-4COMi-M
RS-422 Device
2 TxD+ (B)
RxD+ (B)
1 TxD- (A)
RxD- (A)
3 RxD+ (B)
TxD+ (B)
4 RxD- (A)
TxD- (A)
5 GND
GND
7 RTS+ (B)
CTS+ (B)
6 RTS- (A)
CTS- (A)
8 CTS+ (B)
RTS+ (B)
9 CTS- (A)
RTS- (A)
RS-485 4-Wire (Full duplex) Signal Pin-outs of DB-9 Male Connector
Pin 1
TxD- (A)
Pin 2
TxD+ (B)
Pin 3
RxD+ (B)
Pin 4
RxD- (A)
Pin 5
GND
RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-9 Male Connector
Pin 1
Data- (A)
Pin 2
Data+ (B)
Pin 5
GND
