3Com 3CDSG10PWR User Guide - Page 221
Pin-Outs, Null Modem Cable, PC-AT Serial Cable, RJ-45 to RS-232 25-pin, RJ-45 to 9-pin
UPC - 662705520902
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C PIN-OUTS Null Modem Cable RJ-45 to RS-232 25-pin Switch 5500 Cable connector: RJ-45 female Screen Shell TxD 3 RxD 2 Ground 5 RTS 7 CTS 8 DSR 6 DCD 1 DTR 4 PC/Terminal Cable connector: 25-pin male/female 1 Screen only required if screen 3 RxD 2 TxD always required 7 Ground 4 RTS 20 DTR 5 CTS required for handshake 6 DSR 8 DCD PC-AT Serial Cable 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 PC-AT Serial Port Cable connector: 9-pin female Shell Screen only required if screen 1 DCD Required for handshake 2 RxD Always required 3 TxD 4 DTR required for handshake 5 Ground always required 6 DSR 7 RTS required for handshake 8 CTS
C
P
IN
-O
UTS
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
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
Cable connector: RJ-45 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
Cable connector: RJ-45 female
PC-AT Serial Port
Cable connector: 9-pin female
only required if screen
Always required
always required
required for handshake
required for handshake
Required for handshake