http://www.redhat.com/mirrors/LDP/HOWTO/Modem-HOWTO-18.html

Look at the very bottom 18.29 Troubleshooting tools

On Wed, Jan 23, 2013 at 4:21 PM, Howard White <hwh...@vcch.com> wrote:
> On 01/23/2013 04:07 PM, Tilghman Lesher wrote:
>
>>
>> ls -l /dev/tty*
>>
>> No, seriously, that's it.  The problem is that a modem (and I'm
>> assuing you're talking about an external modem, because internal
>> modems will show up on the PCI bus) doesn't actually say "Here I am"
>> in any qualitative way, at least not intrinsically.  You essentially
>> have to query it, yourself, using a program like minicom, to first
>> connect to the port (assuming you know the connection parameters
>> (speed, parity, stop bits), and then hitting the Enter key a couple
>> times until the "OK" response comes back, or alternately, nothing at
>> all.
>>
>> Yes, it's not the greatest interface, but unlike some of the later
>> interfaces, a modem worked with positively every computer that had a
>> serial port.
>>
>> -Tilghman
>>
>
> But you see, that is my problem.  When one lists out /dev/tty*, one gets all
> the "pointers" defined in the operating system, regardless of what is
> connected.  And, yes, I understand your comments about the nature of the
> devices on the other end of the serial port not telling the OS what they are
> until there is some query.
>
> Oh, the case I'm chasing right now does involve PCI cards - fax modems -
> that do appear on lspci but I don't know what ttyS?? it is configured for.
>
> Howard
>
>
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