[CentOS] External Dial-up Modem

[Les Mikesell]

On Mon, Sep 26, 2011 at 11:20 AM, Graham Johnston
<johnstong at westmancom.com> wrote:
> I am having an issue with Centos 6 and an external USRobotics modem.  We
> use the modem as part of a last resort SMS paging system.
>
>
>
> Across multiple Dell servers, different models, I can't not get the
> modem to respond to simple AT commands while using Minicom.  At the same
> time if I connect the server to a console port on a switch I can
> successfully access the switches serial console.  So I know the serial
> port itself is working.  The modem still works fine if connected to a
> Centos 5 server.
>

I normally use ckermit (available from epel) for serial port access
because you can 'set carrier off' before connect so it doesn't hang
waiting for the carrier detect line to come up and because it has a
scripting language that works the same over tcp (handy if you move
your modems to a terminal server).  I assume you know that the cable
needs to be different for modem and console connections.  You might
also loop DTR to DCD, but then you won't know when the connections
drop.

-- 
  Les Mikesell
    lesmikesell at gmail.com