Technical Appendix - Interfaces
V Box Express – User’s Manual
33
Serial Port (COM3, COM4) RS422 (Option)
Pin Signal
Name
9-pin D-SUB Plug (male)
1
TXD- (Transmit Data -)
2
RXD+ (Receive Data +)
3
TXD+ (Transmit Data +)
4
RXD- (Receive Data -)
5 GND
(Signal
Ground)
6
RTS- (Request to Send -)
7
RTS+ (Request to Send +)
8
CTS+ (Clear to Send +)
9
CTS- (Clear to Send -)
Serial Port (COM3, COM4) RS485 (Option)
Pin Signal
Name
9-pin D-SUB Plug (male)
1
TXD- (Transmit Data -)
2
RXD- (Receive Data -)
3 NC
4 NC
5 GND
(Signal
Ground)
6
TXD+ (Transmit Data +)
7
RXD+ (Receive Data +)
8 NC
9 NC
