3Com 3300 XM - Pin-Outs; Serial Cable Pin Assignments

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
RTS
CTS
DSR
DCD
DTR
Screen
RxD
TxD
Ground
RTS
DTR
CTS
DSR
DCD
Shell
3
2
5
7
8
6
1
4
1
3
2
7
4
20
5
6
8
Switch 3300 XM, SM, TM, MM
Cable connector: 9-pin female
PC/Terminal
Cable connector: 25-pin male/female
only required if screen
always required
required for handshake
Screen
DTR
TxD
RxD
CTS
Ground
DSR
RTS
DCD
Screen
DCD
RxD
TxD
DTR
Ground
DSR
RTS
CTS
Shell
4
3
2
8
5
6
7
1
Shell
1
2
3
4
5
6
7
8
Switch 3300
Cable connector: 9-pin female
XM, SM, TM, MM
PC-AT Serial Port
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