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000020_toralf-delete-…@procaptura.com_Fri Apr 25 09:31:38 EDT 2003.msg
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Article: 14236 of comp.protocols.kermit.misc
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From: Toralf Lund <toralf-delete-this@procaptura.com>
Subject: Communication protocol for direct serial link (null-modem or similar)?
Newsgroups: comp.protocols.misc,comp.protocols.kermit.misc,comp.protocols.ppp
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Organization: ProCaptura AS
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Date: Fri, 25 Apr 2003 11:02:55 +0200
Xref: newsmaster.cc.columbia.edu comp.protocols.misc:9747 comp.protocols.kermit.misc:14236 comp.protocols.ppp:39839
I'm looking for a protocol that may be used for simple communication
across a direct serial link - RS232 using null-modem cable or similar -
between a Linux host and a simple (old) IPC (Intelligent Peripheral
Controller) board.
The IPC has no real OS, just a simple, custom kernel, and rather limited
development support, so the protocol needs to be simple to implement.
Also, the system is really low-end by today's standards - it's has a
12.5Mhz MC68010 CPU and 1Mb RAM - so the runtime must be fairly small and
efficient.
The link will be used only to send simple packets ("commands") to the IPC,
and status from the IPC back to the Linux system; there will be no file
transfers or anything.
Protocols I've considered:
- Kermit
- AHDLC/LAPB (as utilised e.g. by PPP) - X/Y/Z-modem
What would you people out there recommend choosing? And does anyone know
of any good example source code that may help me get started? I'm
primarily interested in a nice and isolated implementation of the packet
communication itself, i.e. source code without all the additional bits
normally found in comms packages, like UI operations, file I/O, modem dial
etc., which I don't need (and I don't want them there to confuse
everything.)
--
- Toralf