Cheapest than using a SN75176 or MAX485? Isn't that cheap enough?
Perhaps, you may add some transistors, but that=92s all...

Mauricio Jancic
Janso Desarrollos
(54) 11 4542 3519
Republica Argentina
Microchip Consultant Program Member


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Marc Nicholas
Sent: Mi=E9rcoles, 02 de Julio de 2003 17:53
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: Inexpensive RS232<-->RS485


Someone's asked me to look at a design for a *cheap* RS232 to RS485
converter. The device needs to talk to a Compaq iPaq on one side (so I'm
presuming it's probably not even real RS232) and then interface for
short periods of time with an RS485 flow meter.

Any bright ideas? I'm tempted to maybe try and do this completely with a
PIC...

-marc

P.S: I realize there are lots of RS232<-->RS485 converters on the
market, but this design needs to be cheap, simple, small and self
powered...


--------------------------------------------------
Marc Nicholas Geekythings Inc. C/416.543.4896
UNIX, Database, Security and Networking Consulting

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