3com 4500G Quick Setup Guide
A
P
IN
-
OUTS
Null Modem Cable
RJ-45 to RS-232 25-pin
PC-AT Serial Cable
RJ-45 to 9-pin
Screen
TxD
RxD
Ground
RTS
CTS
DSR
DCD
DTR
RxD
Ground
RTS
CTS
DSR
DCD
DTR
Screen
RxD
TxD
Ground
RTS
DTR
CTS
DSR
DCD
TxD
Ground
RTS
DTR
CTS
DSR
DCD
Shell
3
2
5
7
8
6
1
4
2
5
7
8
6
1
4
1
3
2
7
4
20
5
6
8
2
7
4
20
5
6
8
Switch 5500
Cable connector: RJ-45 female
Cable connector: RJ-45 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
CTS
Ground
DSR
RTS
DCD
TxD
RxD
CTS
Ground
DSR
RTS
DCD
Screen
DCD
RxD
TxD
DTR
Ground
DSR
RTS
CTS
RxD
TxD
DTR
Ground
DSR
RTS
CTS
Shell
4
3
2
8
5
6
7
1
3
2
8
5
6
7
1
Shell
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
Switch 5500
Cable connector: RJ-45 female
Cable connector: RJ-45 female
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
Required for handshake