I'm having trouble installing a ups monitoring agent on our HP DL380 G4 box. It requires a cable plugged into the one and only serial port on the box (we have the cable), and the agent monitors the ups status via the serial port.

The problem I have is that I don't have any idea of the device name for the serial port. We have Redhat Enterprise Linux 3 on our machine, but I haven't had any luck finding out how to determine what the serial port is called, as I have to enter this information into the agent's configuration.

Any help with this would be greatly appreciated!

Its
/dev/ttyS0
/dev/ttyS1
..etc

Thanks...ttyS0 seems to have been the solution!