Bob Irving wrote:
>1) No.
>2 ) Yes, though a lot of good it will do me without a 'Yes' to (1).
Possible strategic responses:
A) Lobby/plead with the vendor for protocol information.
B) Reverse-engineer it by watching the device talk to a PC.
Re: A, it may help to phrase it in terms of expanding their market for the
devices without them having to risk any software development costs.
Re: B, many years ago, I wrote some personal software for a Mac Plus (which
had 2 built-in serial-ports) to act as a line-analyzer. The receive-side
of each serial-port was connected to the TXD and RXD lines of a DB-25
pass-through connector. As long as I got the baud-rate and frame-format
right (bits/char, parity, stop-bits), it worked pretty well, considering
the limitations. Figuring out baud-rate was usually the worst single
obstacle. An oscilloscope proved useful there. The frame-format was just
randomly arrived at by clicking on-screen controls until the display
started making sense. After that, it's just lots of bit-groveling and a
small matter of programming.
-- GG
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