piclist 2001\02\24\200953a >
Thread: RS485 code?
www.piclist.com/techref/microchip/ios.htm?key=rs485
face picon face BY : James Newton email (remove spam text)



Does anyone have any RS485 code they would be willing to share? The archive
seems to be a bit bare. There is only one code sample since the beginning of
the list in December of 1993.
www.piclist.com/techref/postbot.asp?by=time&id=piclist/1999/11/02/101
717a

Is it true RS232 and RS485 are both just signal specifications? They both
use standard async serial protocols? I know that the practical differences
of 232 vs 485 are:
- single-ended versus differential
- sender-receiver only versus multidrop possible
but doesn't RS485 typically use a 9bit address byte protocol for multidrop
communications?

I have a few references:

'The Art and Science of RS-485'
http://www.chipcenter.com/circuitcellar/july99/c79bppdf.pdf

"Controlling the Transmit Enable Line on RS-485 Transceivers" Aug'99
Embedded Systems Programming
http://www.embedded.com/1999/9908/

But no book recommendations.

Any information appreciated. I'm trying to fill out the page at
http://www.piclist.com/microchip/rs485.htm


James Newton, PICList Admin #3
KILLspamjamesnewtonRemoveMEspamEraseMEpiclist.com
1-619-652-0593 phone
http://www.piclist.com

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