B
Null Modem Cable
PC-AT Serial Cable
P
-
IN
OUTS
RJ-45 to RS-232 25-pin
Switch 3870
Cable connector: RJ-45 female
Screen
Shell
TxD
3
RxD
2
Ground
5
RTS
7
CTS
8
DSR
6
DCD
1
DTR
4
RJ-45 to 9-pin
Switch 3870
Cable connector: RJ-45 female
Screen
Shell
DTR
4
TxD
3
RxD
2
CTS
8
Ground
5
DSR
6
RTS
7
DCD
1
PC/Terminal
Cable connector: 25-pin male/female
Screen
1
3
RxD
2
TxD
Ground
7
4
RTS
20
DTR
5
CTS
6
DSR
8
DCD
PC-AT Serial Port
Cable connector: 9-pin female
Screen
Shell
1
DCD
2
RxD
3
TxD
4
DTR
5
Ground
DSR
6
RTS
7
CTS
8
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