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000144_fdc@columbia.edu_Sun Mar 21 13:23:48 2004.msg
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Path: newsmaster.cc.columbia.edu!not-for-mail
From: Frank da Cruz <fdc@columbia.edu>
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Kermit at Mac OS X with Keyspan SX Pro
Date: 21 Mar 2004 17:49:00 GMT
Organization: Columbia University
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In article <7d86b4de.0403210731.2ff5d4e0@posting.google.com>,
Wolfgang Husmann wrote:
: I have been using successfully Kermit on my G4/Mac OS X
: 10.2.x/Griffins G4Port to communicate with my scientific calculator
: Hewlett-Packard HP-48SX (for details please refer to my web page
: http://chaos-zu-haus.de/HP48AndMacOSX/HP48AndMacOSX.html).
:
: Recently I replaced Griffins G4Port (with a 3-way serial switch) by a
: Keyspan SX Pro 4-port serial card. While my serial Palm III craddle
: (software: Palm Desktop) and my modem US Robotics Sportster Vi
: (software: Apples PPP) continue to work without any problems I cannot
: get the HP-48SX to work: Kermit says "Carrier required but not
: detected. Connection broken (carrier signal lost)."
:
That means the new port or driver or cable is not supplying the carrier
signal to the Mac. On modem connections, the carrier signal tells each
computer that a connection exists. On direct connections, usually the
DTR and CD signals are cross wired, thus if computer A is turned on and
its port is active, its DTR signal comes to computer B's CD input. And
vice versa.
: - "set carrier-watch off" in Kermit makes Kermit to wait forever
: instead of aborting with an error
:
This command tells Kermit to ignore the carrier signal and assume the
connection is active even though the carrier signal is not present.
It works if the underlying device driver allows it to work (as far as
I know, all Unix serial-port drivers do allow it, since otherwise there
would be no way to dial a modem).
: Kermits "show communications" reveals differences between the Keyspan
: SX Pro and Griffins G4Port:
:
: "Carrier Detect (CD)": SX Pro OFF, G4Port ON
: "Clear To Send (CTS)": SX Pro ON, G4Port OFF
:
: I do not really understand what that means and how that may affect
: kermits communication with the HP.
:
Since PPP works, I presume we can rule out problems with the port itself.
But this is a modem connection, and modems supply a carrier signal.
What is the physical connection to the HP-48? Are you using the same Mac
port as for PPP? Then you must change the cable -- a Null Modem (crossover)
cable is required for this, rather than a straight-through (modem) cable.
The only way to connect a computer to the HP-48 is with a special cable that
comes from HP. Is that the cable you're using? Where is it plugged in?
To your switch?
Presumably the new port came with its own drivers. Drivers are installed
in Unix (including Mac OS X) as device files, /dev/xxx. Maybe you are using
the wrong device name.
- Frank