[ale] OT re. serial pinouts

[Jim Lynch]

RTS - CTS
DSR - DTR
RD -TD

See http://www.loop-back.com/null-mod.html for pinouts.

Jim.
Scott Denlinger wrote:

>Hi everyone,
>
>I'm trying to make a management cable for my Cisco uBR904 cable modem, since it
>didn't come with one when I bought it, and I'm wondering if anyone can help me
>with the pin-outs. Like other Cisco management cables, it's a serial cable with
>RJ-45 on the modem end, and serial (DE-9) on the computer end.
>
>In general I know you need to cross the TX and REC pins for serial
>connections, but do you need to do the same for DTR and DSR? Or does DSR on the
>cable modem connect to DSR on the computer's serial port, and DTR go to DTR?
>Should my pinouts go like this:
>
>  modem     computer
>  TX   ---> REC
>  REC  ---> TX
>  DTR  ---> DTR
>  DSR  ---> DSR
>
>or like this:
>
>  modem      computer
>  TX   --->  REC
>  REC  --->  TX
>  DTR  --->  DSR
>  DSR  --->  DTR
>
>(note that I'm not necessarily indicating signal direction in the above, just
>connections)
>
>Thanks.
>
>Scott Denlinger
>
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