At 12:02 AM 11/22/02 +0200, you wrote:
>Spehro,
>
>I already have system setup which uses pic and max232.  Now however, I want
>to use rs485 instead of 232.  So I am quirous, can I dump the max232 and use
>max485/487 and get away with not chaning the code (tested and bullet broof,
>so I do not want to change it) but maybe make small changes to the
>schematic.

Maybe. You'd have to add a monostable to enable the transmitter and assure
yourself that the timing was okay. It's been done in dongle modules to
convert serial ports to RS-485.

Either that, or use two twisted pairs, if you don't have to deal with
multidrop situations.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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