ct@mit-caf.MIT.EDU (Curtis Tsai) (12/15/89)
I'm experiencing problems with hooking a modem up to a VAXstation 3100
Model 30 to allow dialups.
I'm using a MMJ to 25pin female connector (DEC part H8571-A) and a BC16E
cable to connect the communications port of the VAXstation to a Supra
2400 baud modem which supports AT command set. The force DSR on
attribute was turned off for the modem, as specified by the VAXstation
3100 manual.
On the software end, I modified the following line to the /etc/ttys file:
tty02 "/etc/getty H2400" dialup on modem
Then I issued a hangup signal to init as root and examining the
processes showed that getty was indeed running.
Upon dialing up with a PC, the VAXstation modem would connect but the
login prompt would not appear on the PC. In addition, the TR light on
the VAXstation modem did not come on. I tried setting the force DSR
to always on but that did not work either.
Am I doing something wrong? I would like to use a cheaper modem but
if it can't be done, will I have to purchase a DF242 Scholar Plus
modem at $709?
Thanks for you help.
Send me email or post on the net whatever you prefer.
Curtis Tsai Internet: ct@caf.mit.edu 18.0.62.232
Usenet: {ihnp4,harvard,seismo,rutgers}!mit-eddie!mit-caf!ctrobino@sactoh0.UUCP (John W. Robino) (12/17/89)
In article <3595@mit-caf.MIT.EDU> ct@caf.mit.edu (Curtis Tsai) writes: >I'm experiencing problems with hooking a modem up to a VAXstation 3100 >Model 30 to allow dialups. > > tty02 "/etc/getty H2400" dialup on modem > >to always on but that did not work either. > >Am I doing something wrong? I would like to use a cheaper modem but >if it can't be done, will I have to purchase a DF242 Scholar Plus >modem at $709? > The DF242 won't do any more for you than any other modem. Problem here is that the VS3100 doesn't support full modem control on either port. tty03 has DTR set high all the time which your modem might want to see. BTW, neither port looks at DSR. If u can set DTR high on the modem, do so. That ensures that it will always answer the phone. Real trick here is not to tell your machine that it's a modem port. That's because modem signals aren't much supported. Pretend it's a direct connect terminal (but keep using the same cable) and it should work ok. The problem with keeping DTR high all the time is that you're not going to be able to control hangup and session ends. But you're not going to be able to control DTR in any case because you can't tell your machine you have a modem. Therefore, users will have to be sure to hang up the phone after they finish a session. Pretty garbled answer but u probably get the idea. -robino +----------------------------------------------------------------+ | John Robino | | | Linear Software Assoc | | | Sacramento CA | | | | I'm still working | | Internet: robino@c3po.af.mil | on my .sig file | | UUCP: pacbell!sactoh0!robino | | | sun!portal!portal.com!robino | | | VAX/VMS (916) 482-5621 - guest | | +----------------------------------------------------------------+