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000256_news@newsmaster….columbia.edu _Sat May 31 14:09:51 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc,comp.unix.solaris
Subject: Re: Disconnect and [D]TR Problems
Date: 31 May 1997 18:09:49 GMT
Organization: Columbia University
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In article <georgebEB0LD3.9p0@netcom.com>,
George H. Bosworth <georgeb@netcom.com> wrote:
: I use Kermit 6.0.192 on Solaris 2.5 with a Supra FAXModem 288.
:
: After logging out from a remote connection, the modem sends NO
: CARRIER, and I Cntrl-\-c out, and quit Kermit. Quickly the TR (DTR)
: light comes on on the modem.
:
When you log out from the remote, it hangs up the phone. Your modem
sees the connection is hung up and reports NO CARRIER. It is also supposed
to turn off its CD signal so Solaris will know the connection is closed,
return an error to C-Kermit, so C-Kermit can pop back to its prompt
automatically.
: How can I:
:
: 1. Disconnect more cleanly
: 2. Turn off the TR light during the exiting.
:
The HANGUP command turns off DTR for a period of time (usually 1/2 second)
and then turns it back on. This is proper behavior. In this case, it doesn't
matter since the connection is already hung up.
: /users/georgeb 245 % more .kermit <-- You mean .kermrc?
: ... ^^^^^^^
: set quiet on
: set line /dev/term/b ; Modem device
: set modem type supra ; Is Supra FAXmodem 288
: set modem hangup-method rs232-signal ; One of 2 options
:
All your settings appear to be OK. In particular, you do not seem to have
given a SET CARRIER OFF command, which would have explained the behavior that
you report.
Modem settings:
: at&v
: ACTIVE PROFILE:
: B1 E1 L2 M1 N1 Q0 T V1 W0 X4 Y0 %C3 %E0 %G1 -K0 &C1 &D2 ...
: ^^^
This shows that the modem is correctly configured to turn off CD when carrier
is dropped.
So why isn't Kermit noticing when the call is disconnected? The most logical
explanation would be a nonstandard modem cable that loops DTR back to CD.
If that's not it, then I'm stumped. Solaris has System-V-like tty drivers,
which are supposed to return an error to the application when CD drops and
CLOCAL is not set -- which it is not (C-Kermit sets this while dialing, unsets
it after the call is completed). This is in contrast to SunOS, which is known
not to return an error when a call is hung up and so SunOS C-Kermit never pops
back to its prompt automatically on a serial connection.
I don't have access to a Solaris system that has a serial port connected to
a dialout modem, so I can't troubleshoot this one myself. Can anybody else
out there shed any additional light?
- Frank