Modem control on ttyS0

[Michael Hipp]

On Mon, 2002-07-29 at 16:41, Bill Campbell wrote:
> Are you using the correct cable?  The APC SmartUPS come with two cables,
> grey and black.  The black cable is used with proper modem control.  Unlike
> SCO OpenServer which has different devices for modem control and no modem
> control, Linux generally only as one.

I'm using a gray cable for "basic" signaling. I have another server
attached to the "smart" port and using a black cable. And a Winders box
with a gray cable next to it works fine so I know the overall setup is
correct.

> 
> Is it possible that you have some other device that has the modem port
> open?  ``lsof /dev/ttyS0'' should tell you what processes are using it if
> this is the problem.

/usr/sbin/lsof ttyS0 returns nothing.

Thoughts?

Michael