Can't Query External Serial Modem

[Bernard Helyer]

>From: "Tommy Trussell" <tommy.trussell at gmail.com>
>Reply-To: "Ubuntu user technical support,not for general discussions" 
><ubuntu-users at lists.ubuntu.com>
>To: "Ubuntu user technical support,not for general discussions" 
><ubuntu-users at lists.ubuntu.com>
>Subject: Re: Can't Query External Serial Modem
>Date: Mon, 12 Mar 2007 20:02:15 -0500

>
>I recommend going back to minicom (or HyperTerminal if you must) and
>try several different serial settings. For most similar serial devices
>I would expect 115200 - 8N1 to work. (That's 115200 bits per second, 8
>bits, no parity, 1 stop bit. In minicom there's a shortcut option to
>set the 8N1.)
>
>First I would try downgrading the speed to 57600 bps, then maybe down
>even to 19200 if that doesn't work. In between speed changes you can
>try powering down the modem. You should normally see an OK when you
>type AT <enter> -- but be sure to give it about a 3 second pause
>before typing the next attempt. Since you're certain the lights are
>blinking in response to what you're typing, it's possible the modem
>firmware is set to not respond, but you should get a dialtone and
>dialing sounds when you type ATDT11111 or something like that.
>
>OH and of course some modems sense the state of the phone line, so
>plug a telephone into the auxiliary port and make sure the connection
>is good through the modem.
>
>If none of that has the effect you expect I would next suspect that
>the serial cable is wired for another type of device (something other
>than a modem).
>
>But diagnosing serial devices is somewhat of a "black art." Let me
>know what you discover.


I should clarify - HyperTerminal doesn't cause the lights to respond, 
wvdialconf does. And minicom sends the lights flashing maybe 1 time in 
30/40.

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