Bug 348 - Erratic response from modem
Erratic response from modem
Product: Red Hat Linux
Classification: Retired
Component: minicom (Show other bugs)
All Linux
medium Severity medium
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Assigned To: David Lawrence
Depends On:
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Reported: 1998-12-08 09:23 EST by tacedi
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 1998-12-29 15:26:10 EST
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Description tacedi 1998-12-08 09:23:01 EST

I'm trying to get a fax modem working with efax under Redhat
5.2 without success.   I think the problem is that the modem
is not sending responses back to the efax software.

When I try to use minicom to test the connection, I
initially get no echo of commands.   I still get no echo
when I issue "ATE1".  When I use ctrl-a z, and select the
option to toggle local Echo on/off, I then see commands
echoed; however, there is no OK response.

The strange thing is that if I do nothing for about 10
minutes, then type AT,  I suddenly get double echo, e.g.,
"atat", followed by the OK prompt.   If I then toggle local
Echo on/off, everything seems to work ok.

If, instead of using minicom, I do "cu -l /dev/modem", I get
"Connected", but I cannot get an "OK" response from the
modem, nor do I see my commands echoed back to the terminal
even though I issued ATE1 (echo keyboard input).

Using either minicom or cu, I can dial another phone number
(e.g., "ATDT[number]") in my office and get a ring, even
though I never get any responses from the modem.

I've tried two different modems with the same results.  I am
using the same cable I used with the modem when I was
running Win95.

Any ideas would be appreciated.

Willis Gregory
Comment 1 Aleksey Nogin 1998-12-08 19:54:59 EST
You may want to install the setserial RPM and use the setserial
program to make sure you are using the right IRQ number.
Comment 2 David Lawrence 1998-12-29 15:26:59 EST
This is a modem configuration issue. We were unable to replicate it in
the test lab.

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