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