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000102_news@columbia.edu _Mon Mar 6 21:12:50 2000.msg
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From: Peter Easthope <peter_easthope@gulfnet.pinc.com>
Subject: flow control for external modem
Date: Tue, 07 Mar 2000 02:03:57 GMT
Organization: GulfNet-Galiano
Message-ID: <8a1o2b$ob9$1@nnrp1.deja.com>
To: kermit.misc@columbia.edu
In <89ofke$16g$1@newsmaster.cc.columbia.edu>
posted at 2000 Mar 3 13:44:46 GMT Jeffrey
Altman said,
ja> MS-DOS Kermit ... cannot automatically set
the modem to use RTS/CTS flow control. You need
to do that as part of your dialing script.
The modem is an external, Practical Peripherals
MC144MT II. The script invoked is PPI.SCR
containing these lines among others.
echo Enabling hardware flow control...
output AT &K3\13 ; Enable RTS/CTS hardware flow control
chkok {Can't enable RTS/CTS} ; On modem
wait 5 cts
if fail errfail {Modem is not asserting CTS!}
set flow rts/cts ; And in Kermit too, but only now
Can someone please explain the importance of
having "output AT &K3\13" before "set flow rts/cts".
The modem has not begun to transmit data
when this script is executed; I do not see the
harm in putting "set flow rts/cts" first.
I replaced the serial card and the serial
cable and replaced the PPI modem with a USR.
The BEL characters appear at about the same rate
as previously.
In <v++aZh$Y0r1p@cc.usu.edu> posted at
2000 mar 02 Joe Doupnik said,
If you are using a serial comms line
then if your machine is unable to service interrupts for each character
then one character overwrites the older one, and in such cases I replace
the even with a binary 7 code as a warning that trash exists. Use flow
control for serial comms lines to help this problem.
How does MS-DOS Kermit know that the machine is
unable to service interrupts?
According to *.SCR mentioned above, RTS/CTS flow
control is invoked.
The serial cards available here do not have the
16550A UART mentioned in KERMIT.BWR. Would the
better UART solve the problem?
Thanks, peter_easthope@gulfnet.pinc.com
Sent via Deja.com http://www.deja.com/
Before you buy.