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From: "Rod Pemberton" <do_not_have AT nowhere DOT cmm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DOS MODE command patch for CTTY w/o CTS / DSR ?
Date: Thu, 9 Aug 2007 19:33:06 -0400
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"Ivor Bowden" <ivorlist AT peritek DOT com> wrote in message
news:46b8eb0a$0$16369$88260bb3 AT free DOT teranews DOT com...

>... if hardware handshaking (RTS/CTS & DTR/DTS) are connected.
> Unfortunately, on the system I need to debug these signals are not
> available.
...
> The problem is I can not access the DSR/DTR signals to jump them,
> they are not available.

You are connecting two computers (DTE) together, correct? You can use loop
back handshaking (nulling RTS/CTS and CD/DTR/DTS) for one machine, but not
the other, correct? Why not? Could you explain how can access the Tx/Rx (or
TD/RD) pins but not RTS/CTS/DTR/DTS/CD pins on the "problem" machine? What
pins do you have access to on the "problem" machine? Are you connecting
directly to lines on the MB?  Directly to the serial IC?  In every scenario
I can come up with, you should have access to the other lines...

"RS232 null modem with loop back handshaking" here:
http://www.lammertbies.nl/comm/cable/RS-232.html
and more "RS232 null modem with loop back handshaking" here:
http://www.lammertbies.nl/comm/info/RS-232_null_modem.html#loop

Curious and confused...


Rod Pemberton