Serial Ports 474
RS-232C Connections to Host PC with 25-pin D-type connector
Host PC Control
Signal Name DB-25 Pin Signal Name DB-9 Pin
Shield 1 Shield N/C
RxD 3 TxD 2
TxD 2 RxD 3
Common 7 Common 5
Control RS-422 DB-9 Pinout
Pin Signal Name Description
1 Shield Chassis Ground
2 TxD- Transmit Data - to External Device
3 RxD- Receive Data - from External Device
4 TxD+ Transmit Data + to External Device
5 Common Ground
6 No Connection
7 RxD+ Receive Data + from External Device
8 No Connection
9 No Connection
RS-422C Connections to Host PC with 9-pin D-type connector
Host PC Control
Signal Name DB-9 Pin Signal Name DB-9 Pin
Shield 1 Shield N/C
RxD- 3 TxD- 2
TxD- 2 RxD- 3
RxD+ 7 TxD+ 4
TxD+ 4 RxD+ 7
Common 5 Common 5
RS-422 Connections to Host PC with 25-pin D-type connector
Host PC Control
Signal Name DB-25 Pin Signal Name DB-9 Pin
Shield 1 Shield N/C
RxD - 3 TxD - 2
TxD - 2 RxD - 3
RxD + 14 TxD + 4
TxD + 16 RxD + 7
Common 7 Common 5
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