[CentOS] Need to test serial port connection

Scott Silva ssilva at sgvwater.com
Thu Feb 26 19:50:16 UTC 2009


on 2-26-2009 8:55 AM Anne Wilson spake the following:
> On Thursday 26 February 2009 13:37, William L. Maltby wrote:
>>>> Look in your /var/log/messages file. At boot, you should see the device
>>>> recognized.
>>> Feb 26 12:12:25 borg2 kernel: serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is
>>> a 16550A
>>> Feb 26 12:12:25 borg2 kernel: serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is
>>> a 16550A
>> Didn't you say there was only one port? There might be a second on the
>> main board that is accessible via a header. If it's not hooked up
>> disable all but the first in the BIOS (later). It's not really hurting
>> anything as is, but it will free the I/O address and IRQ for assignment
>> to other devices. 
> 
> I believe you are right. I remember those - and the 25-9-pin adapter :-).  
> Peering around the back in a dark corner, I  could well have been mistaken.  
> OK - female socket, so that's a  COM port, I think.
> 
> Now I'm really confused.  The BIOS definitely only shows one COM port.  To be 
> honest, I can't remember whether I connected it or not.  I guess I ought to 
> open the box and see what's what, but not today - it's already too late to do 
> that.

Is there an internal modem? It might account for a second serial port.

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