topic Re: Reset modem in Operating System - HP-UX

Reset modem

Juno — Thu, 16 Jan 2003 03:41:08 GMT

I have a modem is connected to our UNIX panel and remote side for the user to dail-in, but sometimes the remote side terminate the connection, but the local modem do not hang up , it seems still connected , can I ask the UNIX to send some reset code to the modem after the user is logout? Thx.

Re: Reset modem

Rajeev Shukla — Thu, 16 Jan 2003 04:25:26 GMT

Yes this a problem experienced sometimes. You need to change the parameters in /etc/gettydefs say if you are connecting at 9600 then change the 9600 line in gettydefs to have the follwing

9600 # B9600 HUPCL SANE CS8 -PARENB ISTRIP IXANY TAB3
# B9600 SANE CS8 -PARENB ISTRIP IXANY TAB3
#login: #9600

Its should work then

Thanks
Rajeev

Re: Reset modem

Juno — Thu, 16 Jan 2003 06:33:48 GMT

How do i know what is the connection speed ?thx.

Re: Reset modem

Alexander M. Ermes — Thu, 16 Jan 2003 06:53:30 GMT

Hi there.
In the /etc/gettydefs the B9600 gives you the connection speed.

This is what we use for the MultiTech modems :
in /etc/gettydefs ( Speed 38400 ) :

38400m # B38400 HUPCL OPOST CS8
# B38400 HUPCL SANE CS8 IXANY TAB3
#Please login(38400): #38400m

You also have to give this to the respawn in the /etc/inittabs :

a0:3:respawn:/usr/sbin/getty -h -t60 ttyd2a5 38400m # Dialback Modem

Then you should be fine.
Rgds
Alexander M. Ermes
p.s.
check the manpages for gettydefs and inittab, that might help.

Re: Reset modem

Juno — Thu, 16 Jan 2003 08:53:10 GMT

can the system send the modem reset code (force modem on-hook) to the modem automatically once the connection is termination ? Thx.

Re: Reset modem

Rajeev Shukla — Thu, 16 Jan 2003 10:55:09 GMT

To check your connection speed look at the tty you are connecting and then check that tty in /etc/inittab or you can also check from the client side by checking the modem configuration and see at what speed it connects and accordingly change the line in /etc/gettydefs

Rajeev