I don't know redhat specifics but...

you may have /dev/modem or /dev/mouse symbolicly linked to /dev/ttyS0 or
/dev/ttyS1

Also IIRC /dev/cua0 and /dev/cua1 are special cases of /dev/ttyS0 and /dev/ttyS1
so these (cua) devices could be in use which might screw up something else
trying to use S0 and S1.

If I were in your position I would search the startup scripts (rc.* - probably
hanging off /etc) for references to all the above named devices.

you could also try looking for other symbolic links to your serial ports, try
something like

        ls -al /dev | grep ttyS | less

Regards
Sergio Masci


----- Original Message -----
From: Herbert Graf <hgraf@EMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, April 20, 2004 9:07 PM
Subject: [OT]: Help with Linux and UPS


> Just bought myself a UPS with Linux support.
>
> I installed the package (called cupsd, which is the identical name of the
> printing daemon in Linux...) and it isn't working. :(
>
> The daemon keeps reporting "UPS connection error".
>
> There is very little documentation that I can find with regards to it.
> However the readme does state the following:
>
> In order to use the package, you must have an available
> serial port.  This serial port should not be running getty or any
> other communications software.  The permissions on the serial
> port should also be changed to mode 600, to prevent malicious
> users from killing the power.
> The possible choice is "/dev/ttyS0" or "/dev/ttyS1".
>
> I have it set to ttyS0.
>
> Anyone know how I go about checking (and removing) the "getty or any other
> communications software" on this port?
>
> I'm running Redhat 9.0.
>
> Thanks for any help. TTYL
>
> ----------------------------------
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> http://repatch.dyndns.org:8383/pic_stuff/
>
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