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000106_news@newsmaster….columbia.edu _Thu May 21 16:48:57 1998.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: One-Way Transfer
Date: 21 May 1998 20:48:49 GMT
Organization: Columbia University
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References: <35646665.EBB3868B@theriver.com> <6k1qoj$d92$1@apakabar.cc.columbia.edu> <356474F3.A7EF89F9@theriver.com>
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In article <356474F3.A7EF89F9@theriver.com>,
Andy Fox <foxes@theriver.com> wrote:
: Thank you for the quick response!
:
: I set the flow control on both sides to XON/XOFF, and also used the
: ROBUST command on the K95 side. Still no joy.
:
: Here is a little more detail of a typical problem. I start K95 on the
: PC, then put it in SERVER mode. I then select Transfer, then Choose on
: the calculator, which is supposed to ask the PC for a list of files on
: the PC. When I do this, the PC reports "FAILURE: REMOTE HOST
: disabled."
:
So they are communicating. Note the REMOTE HOST is a potentially dangerous
command, so it is disabled in the server by default. If you trust your
calculator, tell K95 to:
ENABLE HOST
(See pages 228-230 of "Using C-Kermit" 2nd Ed., and pages 237-242.)
It would have made a bit more sense for the calculator to send a REMOTE
DIRECTORY command, rather than REMOTE HOST, but unfortunately HP did not
consult with us in putting together their Kermit implementation for the
HP48.
: I also experimented with the handshaking character to no avail. "None"
: seems to be the best choice, since nothing at all happens (well, it does
: time out) if I set the handshaking character to XON or XOFF.
:
Conflicting rumors abound concerning the pecularities of the HP48. All I
can conclude from them is that there are many models that behave differently.
One persistent rumor is that the calculator's serial port can not handle
input and output at the same time; thus it is "half duplex". And furthermore,
that it takes a perceptible amount of time to switch directions; during this
time, it loses incoming bytes.
The way to compensate for this in Kermit 95 is with the command:
set send pause 100
(or other number) -- how many milliseconds to pause prior to sending a
packet to give the HP48's receiver time to wake up.
I would like to hear from other HP48 users about their Kermit settings
and/or experiences with different models or vintages of HP48s, so we can
produce an HP48/Kermit FAQ. Feel free to cross-post here and on the
relevant HP48 newsgroup (I don't know what it is offhand).
- Frank