Null Modem Cable; Pc-At Serial Cable; Modem Cable - 3Com 2924-SFP User Manual

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Null Modem Cable

PC-AT Serial Cable

Modem Cable

-O
UTS
RJ-45 to RS-232 25-pin
Switch 5500
Cable connector: RJ-45 female
Screen Shell
TxD 3
RxD 2
Ground 5
RTS 7
8
CTS
DSR 6
DCD 1
DTR 4
RJ-45 to 9-pin
Switch 5500
Cable connector: RJ-45 female
Screen Shell
DTR 4
TxD 3
RxD 2
CTS 8
Ground 5
DSR 6
RTS 7
DCD 1
RJ-45 to RS-232 25-pin
Switch 5500
Cable connector: RJ-45 female
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
PC/Terminal
Cable connector: 25-pin male/female
1
3
2
7
4
20
5
6
8
PC-AT Serial Port
Cable connector: 9-pin female
Shell
1
2
3
4
5
6
7
8
Shell
3
2
7
8
6
5
1
4
Screen only required if screen
RxD
TxD
always required
Ground
RTS
DTR
CTS
required for handshake
DSR
DCD
only required if screen
Screen
DCD
Required for handshake
RxD
Always required
TxD
DTR
required for handshake
Ground
always required
DSR
RTS required for handshake
CTS
RS-232 Modem Port
Cable connector: 25-pin male
1 Screen
2 TxD
3 RxD
4 RTS
5
CTS
DSR
6
7 Ground
8
DCD
20 DTR