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000168_news@columbia.edu _Sun Feb 2 12:35:37 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: direct serial connection
Date: 2 Feb 1997 17:35:33 GMT
Organization: Columbia University
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In article <32F567DA.3FB0@ix.netcom.com>, <shegonee@ix.netcom.com> wrote:
: Is there a way to use kermit to verify a successful direct
: serial connection between to machines?
:
Yes.
: I have two Pentium PCs side-by-side running Windows 95. If I run a
: null-modem cable from COM2 of one machine to COM2 of the other,
: how can I use Kermit to verify that a serial connection has been
: established?
:
Tell both Kermit programs to:
set port com2
set flow rts/cts
set term echo on
set term cr-display crlf
connect
If your null modem cable is good, then whatever you type on PC A's keyboard
should show up on PC B's screen, and vice versa.
: Question, why can I do the same thing with a direct serial connection
: between COM2 on each machine? I can get the windows up, but when I
: press a key I get a count down in the that goes to zero and a
: message that says *serial port blocked*.
:
This indicates that you probably don't have the RTS and CTS wires crossed,
and/or that you don't have the DTR and CD wires crossed.
: When kermit goes back to
: the command line, there is a message that says *Tx waiting for CTS*.
: I used a null-modem cable which I purchased from a computer retailer.
: I verified that the pins were wired like the Modem B True Null Modem
: in Figure II-5 on Page 372 of "Using C-Kermit" - except that pin 1
: to pin 1 was not connected.
:
If the RTS and CTS wires were crossed, then each Kermit program would be
receiving the CTS signal from the other PC's RTS circuit. So you probably
should check your cable again. The fact that Pin 1 is not connected already
casts some disrepute on the cable -- that's the electrical safety (ground)
circuit. So don't do this while sitting in a bathtub :-)
- Frank