3com 3C16988A User Manual
B
P
IN
-
OUTS
Null Modem Cable
9-pin to RS-232 25-pin
PC-AT Serial Cable
9-pin to 9-pin
Screen
TxD
RxD
Ground
Ground
RTS
CTS
CTS
DSR
DCD
DTR
DTR
Screen
RxD
TxD
Ground
Ground
RTS
DTR
DTR
CTS
DSR
DCD
DCD
Shell
3
2
5
5
7
8
8
6
1
4
4
1
3
2
7
7
4
20
20
5
6
8
8
Switch 3300 XM, SM, TM, MM
Cable connector: 9-pin female
Cable connector: 9-pin female
PC/Terminal
Cable connector: 25-pin male/female
Cable connector: 25-pin male/female
only required if screen
always required
required for handshake
Screen
DTR
TxD
RxD
RxD
CTS
Ground
Ground
DSR
RTS
DCD
DCD
Screen
DCD
RxD
TxD
TxD
DTR
Ground
Ground
DSR
RTS
CTS
CTS
Shell
4
3
2
2
8
5
5
6
7
1
1
Shell
1
2
3
3
4
5
5
6
7
8
8
Switch 3300
Cable connector: 9-pin female
Cable connector: 9-pin female
XM, SM, TM, MM
PC-AT Serial Port
Cable connector: 9-pin female
Cable connector: 9-pin female
only required if screen
always required
always required
required for handshake
required for handshake
1697ua.bk Page 43 Monday, December 3, 2001 11:31 AM