Re: serial.c (half duplex support)

Henning P. Schmiedehausen (hps@tanstaafl.de)
30 Oct 1999 22:41:29 +0200

David.Woodhouse@mvhi.com (David Woodhouse) writes:

> Bear in mind that Profibus has a set list of baud rates at which it
> can work, and of those, I believe only 9600 and 19200 are actually
> achievable with the standard clocks and divisors which we'll find in
> a PC.

[... Profibus ...]

Wouldn't it be easier to put a small microcontroller (say an 8051) on
a board with a reasonable intelligent PCI bridge and implement the
packet transfer in this controller? Then you would just put your
telegram onto the chip, say "hey, send it out" and have no longer
worry about specs?

Ok, you can't use your $10 standard PCI serial hardware, but at least
any user could be assured that the right lamp / engine / magnet is
turned on or off.

If this protocol is only really reliable in hardware, why not
implement it in hardware.

Just some thoughts...
Henning

-- 
Dipl.-Inf. (Univ.) Henning P. Schmiedehausen --             hps@tanstaafl.de
TANSTAAFL! Consulting - Unix, Internet, Security      


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