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000337_icurmtdude@yahoo.com_Wed Oct 22 17:28:48 2003.msg
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Path: newsmaster.cc.columbia.edu!panix!news.maxwell.syr.edu!postnews1.google.com!not-for-mail
From: icurmtdude@yahoo.com (icurmt)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: DSR off ...
Date: 22 Oct 2003 12:48:46 -0700
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References: <cf6cc183.0310211334.2b68926b@posting.google.com> <slrnbpbcob.co2.fdc@sesame.cc.columbia.edu> <8ce22d01.0310211755.5aeb83f8@posting.google.com>
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Thanks for your inputs.
What looks like is that DTR pin is turned high during set line call
and is turned low during hangup.
If, I can keep the DTR pin low during the communication then it would
solve my problem. Please let me know if there's a higher level call I
can make through script to keep it on.
Also read somewhere that setting speed to 0 and then turning it to
non-zero would flip the DTR pin as well.
Thanks.
JDanSkinner@JDanSkinner.com (Dan Skinner) wrote in message news:<8ce22d01.0310211755.5aeb83f8@posting.google.com>...
> Frank da Cruz <fdc@columbia.edu> wrote in message news:<slrnbpbcob.co2.fdc@sesame.cc.columbia.edu>...
> > In article <cf6cc183.0310211334.2b68926b@posting.google.com>, icurmt wrote:
> > : I wasn't able to communicate successfully between two devices using
> > : RS232. The show comm parameters are as under:
> > :
> > : /dev/ttyS0, speed:19200, mode:local, modem:none
> > : flow:rts/cts, carrier-watch:off
> > :
> > : CD:off, DSR:off, CTS:On, RI:off, DTR: on, RTS:on
> > :
> > : However, on another machine, where the communication worked, I had the
> > : exact same comm parameters as above except that DSR was ON.
> > :
> > : I was wondering if through kermit can I control the DSR and set it to
> > : 'On' so that communication works fine.
> > :
> > DSR is an *incoming* signal so Kermit can't control it. You'll need to
> > rig up your cable to supply it; e.g. Wire local or remote DTR back to DSR.
> >
> > - Frank
>
> Tried and true null modem cable 25 pin D connectors
> 1 ----- 1
> 2 ----- 3 2 twisted pair cable 1 and 7 separate pairs
> 3 ----- 2
> 7 ----- 7
>
> 4 -| |- 4 4 & 5 jumpered in each head
> 5 -| |- 5
>
> 6 -| |- 6 6 - 8 & 20 jumpered in each head
> 8 -| |- 8
> 20-| |-20
>
> Use xon xoff protocol.
>
> 9 pin connectors do literal translation but my memory won't recall
> the pin numbers.
>
> Regards...Dan