PCI Express 4-Port Industrial Serial I/O Card User Guide
4
Pin-out Information
Followings are the pin-out of DB-9 connector of DB-37 to quad male DB-9 cable
RS-422 Pin-out for DB-9 connector
Pin Number
Pin Type
Description
1
Output
TxD- : Transmit Data , negative polarity
2
Output
TxD+ : Transmit Data , positive polarity
3
Input
RxD+ : Receive Data , positive polarity
4
Input
RxD- : Receive Data , negative polarity
5
Ground
GND : Signal Ground
6
Output
RTS- : Request To Send, negative polarity
7
Output
RTS+ : Request To Send, positive polarity
8
Input
CTS+ : Clear To Send, positive polarity
9
Input
CTS- : Clear To Send, negative polarity
