3com 2250-SFP User Manual

A

PPENDIX

 C: P

IN

-O

UTS

RJ-45 to RS-232 25-pin

RJ-45 to 9-pin

RJ-45 to RS-232 25-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

Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR

Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR

Shell
3
2
7
8
6
5
1
4

1
2
3
4
5
6
7
8
20

Cable connector: RJ-45 female

RS-232 Modem Port
Cable connector: 25-pin male