HP-UX with PCI Mux

[MattJ123]

I've got an HP PCI 16 port Mux, a and 56k US Robototics modem. SAM detects the PCI mux, and I've added the port in same which the modem is on. I have tried with both modem, and null modem cables.
with a modem cable:
cu -l /dev/ttyd2a3
Connected:
** No communications with the modem **

with a null modem cable:
cu -l /dev/ttyd2a3
Connected:
at

on the second example, everything echo's and the sd and rd lights on the modem flicker when i type. however at does not return "0" or "OK".

In inittab i have:
a3:3:off:/usr/lbin/uucp/uugetty -r -t 60 -h ttyd2a3 1200

and in /etc/uucp/Devices:
Direct ttyd2a3 - 1200 direct

Any idea's? I'm all out.

[Steven E. Protter]

Lets take a look at ioscan output.

Lets make sure teh mux board and the modem both show up and have unique id's.

If not, one or the other of the two devices may need to be configured with a different id.

For a graphical look on X windows, xstm should see all the hardware.

SEP

[Uday_S_Ankolekar]

I think it's may be due to settings on modem.
Check modem manual for more information.

Also the speed 1200 baud rate is way too small , I would set something with 9600 onwards.

-USA..

[MattJ123]

10/4/3/0 PCI Terminal Multiplexor
the modem is on port 3, but I do not beleve HP has to see it as hardware as the multiplexor would handle that?

Modem is at hardware path:
/dev/ttyd2a3 Modem 10/4/3/0 a3 1200

[MattJ123]

1200 baud is actually perfect. i'm communicating with very old equipment :)

[Darren Prior]

Hi Matthew,

A few points to check:

1) try using tty2a3 - the device you have been using is for dial in access.

2) check the modem's settings. Most modems can be configured so they don't return anything. Are you able to use ATDT1234, does the modem try dialling?

3) check the modem cabling - I've seen USR modems in the past that needed a custom cable due to strange handshaking issues.

regards,

Darren.

[MattJ123]

On another system with 4 working modems connected through the same model of mux I always use ttyd2a3 (well, a2-a5). I'll try a different dce to dte cable, because atdt5555555 does not dial and I did confirm dialtone before attempting.

[Darren Prior]

For 16 port PCI muxes with DB25 connectors and using MultiTech modems I normally suggest the following cables: 40242M or 40234A.

If you are using the ttyd device file - have you checked that it doesn't have CCITT set?

Also, does this modem work on your other servers?

regards,

Darren.