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000119_news@newsmaster….columbia.edu _Fri May 22 16:44:57 1998.msg
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From: Andy Fox <foxes@theriver.com>
Newsgroups: comp.protocols.kermit.misc,comp.sys.hp48
Subject: Re: Kermit on the HP48 (Was: One-Way Transfer)
Date: Fri, 22 May 1998 13:40:32 -0700
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To: Frank da Cruz <fdc@watsun.cc.columbia.edu>
Xref: news.columbia.edu comp.protocols.kermit.misc:8772 comp.sys.hp48:81333
Hi Frank,
I wanted to thank you and Jeff both for helping me get files transferred
in both directions between my HP-48GX and K95 (V1.1.16).
The important points seem to be:
Run the HP-48 in server mode.
HP set up for binary transfers (at least for variables)
K95 "SET CONTROL PREFIX ALL"
Here is a little more information:
<snip>
> : > Postings on comp.sys.hp48 indicate that the HP-48 Kermit implementation
> : > "parses" incoming text-mode material on the fly, and appends the material
> : > from each incoming packet to a "string", resulting in a steadily
> : > deteriorating transfer rate, at least up to some point at which the HP-48
> : > dumps the string to storage and starts over with a new string. There's
> : > not much that the Kermit client can do about that.
> :
> : This is the biggest problem with hp48 kermit.
> :
> Can you help clear this up? What is the deal? Text-mode transfers into
> the HP-48 are the ones that get progressively slower? But binary-mode
> transfers into the HP-48 are OK?
>
It appears to me that it slows down in binary mode also.
<snip>
> So let's start trying to put together the settings to use with MS-DOS Kermit,
> C-Kermit, and Kermit 95 for transferring files with the HP-48:
>
> set modem type direct ; (Skip this in MS-DOS Kermit)
> set carrier-watch off ; (Does the HP-48 assert DCD? If so, use ON.)
There are only four wires, TX, RX, GND and Shield. No hardware flow
control.
> set port <whatever>
> set speed 9600 ; (The best the HP-48 can do)
> set flow none ; (or Xon/Xoff)
> set parity none ; (The HP can accept 8-bit data)
> set control prefix all ; (Don't send bare control chars)
> set receive timeout 99 ; (see Note 1 below...)
> set send pause 100 ; (see Note 2 below...)
>
> Items such as packet length and window size are negotiated automatically;
> there is no need to set them.
>
> 1. If it takes the HP-48 a long time acknowledge data packets (e.g.
> in text mode), tell the file sender to wait a long time for the
> acknowledgement. (Newer versions of C-Kermit and K95 will adjust
> their timeouts dynamically according to the actual behavior, in
> which case the SET RECEIVE TIMEOUT command is not needed.)
>
> 2. The SET SEND PAUSE command is needed if the HP-48's serial port is
> half duplex. The number (100 milliseconds) might need adjustment.
> I'm sure this is highly dependent on the exact model and ROM version.
>
> Finally:
>
> set file type text ; For HP-48 programs
>
> or:
>
> set file type binary ; For all other forms of data
>
I'll have to try transferring programs later, maybe this weekend...
> Oh, by the way, another peculiarity I noticed... If the HP-48 is set up to
> be client of a Kermit server, its method for getting directory listings is
> rather odd. Instead of sending a REMOTE DIRECTORY protocol message, it
> sends REMOTE HOST DIR/W. Of course, this won't work unless the server:
>
> a. Is a DOS or Windows or OS/2 system, and:
>
> b. Has HOST ENABLE'd in its Kermit server.
>
> - Frank
I was able to get a directory listing displayed on my HP, but couldn't
receive the file from the server. Jeff recommended, and I concur, that
the HP should be the server.
Thanks again. I have been impressed with your tech support for several
years (since I became aware of it, actually). I have found your manuals
to be the best written, along with the "Nutshell" series of books by
O'Reilly.
--
72/73 de Andy, KK7HV - QRP-L #1286 - Benson, AZ