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Serial Com Port Problem ttySx

Link to this post 13 Jun 10

Hi all
CentOS 5 on a DSEB-DG motherboard

I am having trouble communicating with my APC UPS on /dev/ttyS0.

What I do know:
UPS and cables are ok they work ok on my other server. CentOS on a Intel S3210SH M/B
Comparing the serial ports in the Hardware browser I notice that the Working system (Intel) is listed as such

16500A-compatible Com port
16500A-compatible Com port
16500A-compatible Com port
16500A-compatible Com port

The non working system lists

16500A-compatible Com port
16500A-compatible Com port

The com ports are set in the bios as:
Com1 3F8/IRQ4
Com2 2F8/IRQ3

So I can see why the system does not work.

What I do NOT know:
How can I correct this problem. Do I need to re-install the drivers? if so HOW.

Thanks for taking the time to read this.

Dave

Link to this post 22 Jun 10

can you provide the output of the following commands:

grep serial /var/log/dmesg

and

cat /proc/tty/driver/serial

you may need to run both as root.

Link to this post 22 Jun 10

Also, your working board uses a SMSC SCH5027D to provide the serial port functionality. Do we know what Chip is on the Asus board?

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