C PIN-OUTS

Null Modem Cable RJ-45 to RS-232 25-pin

Cable connector: RJ-45 female

PC/Terminal

 

 

Cable connector: 25-pin male/female

Screen

Shell

1

Screen

only required if screen

 

TxD

3

3

RxD

 

RxD

2

2

TxD

always required

Ground

5

7

Ground

 

RTS

7

4

RTS

 

CTS

8

20

DTR

 

DSR

6

5

CTS

required for handshake

DCD

1

6

DSR

 

DTR

4

8

DCD

 

PC-AT Serial Cable

RJ-45 to 9-pin

Cable connector: RJ-45 female

PC-AT Serial Port

Cable connector: 9-pin female

Screen

Shell

Shell

Screen

DTR

4

1

DCD

TxD

3

2

RxD

RxD

2

3

TxD

CTS

8

4

DTR

Ground

5

5

Ground

DSR

6

6

DSR

RTS

7

7

RTS

DCD

1

8

CTS

only required if screen

Required for handshake

Always required

required for handshake

always required

required for handshake

Page 221
Image 221
3Com 2924-PWR manual PC-AT Serial Cable, Null Modem Cable RJ-45 to RS-232 25-pin