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000053_news@columbia.edu _Wed Oct 4 18:39:09 2000.msg
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From: jaltman@columbia.edu (Jeffrey Altman)
Subject: Re: No Carrier
Date: 4 Oct 2000 22:36:49 GMT
Organization: Columbia University
Message-ID: <8rgbe1$q2h$1@newsmaster.cc.columbia.edu>
To: kermit.misc@columbia.edu
In article <YaOC5.4391$bI6.264432@news1.giganews.com>,
Steve <steve@baus-systems.com> wrote:
: I have software that runs on DOS computers that uses Kermit 3.15 to transfer
: files to a server running a DOS application under Windows 95 also using
: Kermit 3.15. The DOS computer initiates everything, the connection, the
: file transfers, etc. The files are either transferred locally using a
: serial cable or remotely over a modem. Everything works fine. We are
: trying to switch from 3.15 on the server to K95 to allow multiple transfers
: on the same server at a time and have created the server program using VB.
: It seems to work fine except over a modem. After the DOS computer calls in
: and connects, the first thing it does is issue a FIN to reset the server in
: case the previous transfer did not go to completion. In the K95 version
: over a modem, I always get a no carrier on the DOS computer immediately
: after the FIN as the modem on the server side appears to drop the
: connection. I can tell the server did get the FIN and the DOS computer
: should pause for a couple of seconds before issuing the next command.
:
: We are using a shell command to call K95 that looks like:
:
: For the modem file transfer the .ini file looks like:
: set carrier off
: set port 1
: set speed 9600
: set incomplete discard
: set send packet 94
: set retry 60
: set flow xon/xoff
: set handshake none
: set duplex full
: output AT s0=1\13
: output AT s37=9\13
: server
: exit
:
: The dial string we use on the DOS computer side is:
: output AT&F&C0&D1s37=9N0DT [phone number]\13
:
: Any ideas on why I am dropping the line? Any suggestions on better settings
: on either the server or DOS side?
:
: Thanks,
: Steve
The FINISH command sent by the client and received by the SERVER causes
the SERVER command to terminate. Therefore, the EXIT command is executed
and the K95 session terminates hanging up the modem
There is no need for the FINISH command to be sent, if the previous
session was closed prematurely by the client the SERVER command would
be automaticly terminated when the carrier signal was lost by the modem.
Also, instead of using OUTPUT AT ... just configure the modem with the
proper SET MODEM TYPE command and use the ANSWER command to receive the
incoming call.
Jeffrey Altman * Sr.Software Designer
The Kermit Project * Columbia University
612 West 115th St * New York, NY * 10025 * USA
http://www.kermit-project.org/ * kermit-support@kermit-project.org