B
Null Modem Cable
PC-AT Serial Cable
P
-
IN
OUTS
9-pin to RS-232 25-pin
Switch 4300
Cable connector: 9-pin female
Screen
Shell
TxD
3
RxD
2
Ground
5
RTS
7
CTS
8
DSR
6
DCD
1
DTR
4
9-pin to 9-pin
Switch 4300
Cable connector: 9-pin female
Screen
Shell
DTR
4
TxD
3
RxD
2
CTS
8
5
Ground
DSR
6
RTS
7
DCD
1
PC/Terminal
Cable connector: 25-pin male/female
1
Screen
3
RxD
TxD
2
7
Ground
4
RTS
20
DTR
5
CTS
6
DSR
8
DCD
PC-AT Serial Port
Cable connector: 9-pin female
Shell
Screen
1
DCD
2
RxD
3
TxD
DTR
4
5
Ground
6
DSR
7
RTS
8
CTS
only required if screen
always required
required for handshake
only required if screen
Required for handshake
always required
required for handshake
always required
required for handshake