B
Null Modem Cable
PC-AT Serial Cable
P
-
IN
OUTS
9-pin to RS-232 25-pin
Switch 3300 XM, SM, TM, MM
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 3300
XM, SM, TM, MM
Cable connector: 9-pin 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
1
Screen
3
RxD
2
TxD
Ground
7
4
RTS
20
DTR
5
CTS
6
DSR
DCD
8
PC-AT Serial Port
Cable connector: 9-pin female
Screen
Shell
1
DCD
2
RxD
TxD
3
4
DTR
5
Ground
6
DSR
7
RTS
8
CTS
only required if screen
always required
required for handshake
only required if screen
always required
required for handshake
always required
required for handshake
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