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000105_news@columbia.edu _Mon Sep 20 12:50:09 1999.msg
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Message-ID: <37E6520D.42C0C9EE@omegafilters.com>
From: Michael Newton <mnewton@omegafilters.com>
Subject: X.25 7E1, help?
Date: Mon, 20 Sep 1999 11:26:05 -0400
To: kermit.misc@columbia.edu
I am trying to use C-Kermit to communicate to a point-of-sale host. I am
using Comtrol Rocketmodems, multimodem cards that use Rockwell chipsets.
This is the extent of the information I have on the communications spec:
Transmission line speed: 200 BPS/1200 BPS, Async
Data formats: 7 bit, ASCII, even parity, 1 stop bit
Modulation: FSK carrier frequency - 1070/1270 Hz
Modem: Compatible with Bell 103/212a in originate mode, no error
correction.
The modem documentation speaks of the command ATB1 - "Choose Bell212A
connection at 1200 bps." I can't find any more on this command, but it
appears to have the effect of setting the modem up with no
error-correction or compression, which seems to be what I want. So I do
this in Kermit:
set modem hayes-1200
set parity even
set serial 7e1
set modem command init-string ATB1 X4\{13}
set line /dev/ttyX
set speed 1200
I'd hope this would set things up properly, with the X4 in there so i
can get error reporting (this is driven by an Expect script).
I am told that I am dialing into a UUNet X.25 Cloud. What I am told to
expect is an ENQ control character, after which I send my message, which
contains some alphanumerics and some other control characters, I get
something similar back, I send an ACK, get back an EOT, and we hang up.
The Expect/Kermit arrangment seems to be catching/sending control
characters properly, as far as I can determine so far.
However, there is something wrong, as I cannot seem to get through the
X.25 to the host. I dial, I get CONNECT 1200, i get a few characters,
one of which seems to be an ENQ, then it hangs up on me immediately.
Any insight is appreciated!
Thanks,
Michael