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RJ11 to DB9 pin connections

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mnoman

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rj11 to db9

I have to connect my PC's serial port to a console port of an other equipment such as a router or any txn equipment.
 

rj11 db9

Hello,

there is no standard for RJ45 RS232 pin mapping, it's propietary to manufacturers. It should always be documented with the respective user manuals, also many manufacturers supply an adapter. This is e. g. the pin mapping I found with a Cisco router:

Adapter Cisco RJ45-DB9

1 n.c. <- 7 RTS bn
2 DTR <- 4 DTR bn/wh
3 TxD <- 3 TxD gn
4 GND 5 GND bl/wh
5 GND 5 GND bl
6 RxD -> 2 RxD gn/wh
7 DSR -> 6 DSR or
8 n.c. -> 8 CTS or/wh

Regards,
Frank
 

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