3Com 3800 User Manual page 33

Figure 2-2 shows the pin-outs for a 9-pin to RS-232 25-pin null modem
cable.
Switch 3800
Cable connector: 9-pin female
Screen Shell
TxD 3
RxD 2
Ground 5
RTS 7
CTS 8
DSR 6
DCD 1
DTR 4
Figure 2-2 Null modem cable pin-outs
Figure 2-3 shows the pin-outs for a 9-pin to 9-pin PC-AT serial null
modem cable.
Switch 3800
Cable connector: 9-pin female
Screen
Shell
DTR 4
TxD 3
RxD
2
CTS
8
Ground
5
DSR 6
RTS 7
DCD
1
Figure 2-3 PC-AT serial cable pin-outs
Connecting Equipment to the Console Port
PC/Terminal
Cable connector: 25-pin male/female
1 Screen
3 RxD
2 TxD
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
4 DTR
5 Ground
6 DSR
7 RTS
8 CTS
2-5