RJ45 to serial DE-9

From: r. 'bear' stricklin <red_at_bears.org>
Date: Wed Feb 6 03:08:02 2002

On Tue, 5 Feb 2002, Cameron Kaiser wrote:

> I thought I had one, but I don't. Someone out there have/know where to find
> a cable with an RJ-45 plug on one side and a female DE-9 (DB-25 okay but
> prefer DE-9) on the other? This is to plug my Commodore into the serial port
> on my Lantronix EPS4+1 and attempt to get it on the network by reverse Telnet.

Serial ports on RJ45 are not standardized. Your best bet is to buy an
adapter you can wire yourself.

Speaking of which, I bet Tony can answer this one in a snap, but the rest
of you can play, too.

I just wired a handful of these adapters for my own asynch comms server.
Crossing TX and RX, as well as RTS and CTS, was a "no-duh". But what the
heck do I do with DSR, DCD, and DTR? Part of my problem is I don't
understand exactly what those signals are used for and how they relate to
each other.

I looked at some PC "null modem" cables and they seem to tie DSR and DCD
at one end, to DTR at the other. I'd do this exact thing for my setup but
the comm server only offers DCD and DTR signals.

How do I handle DSR, DCD, and DTR in this situation? I tried leaving them
unwired but things seemed unhappy.

ok
r.
Received on Wed Feb 06 2002 - 03:08:02 GMT