James:

Take a look at www.lvr.com and the book by Jan Axelson called "Serial Port
Complete".

-Robert Severson
http://usbsimm.home.att.net
http://www.jged.com
http://www.annatechnology.com

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of James Newton
> Sent: Saturday, February 24, 2001 7:03 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: RS485 code?
>
>
> 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.
> http://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
> mailto:jamesnewton@piclist.com
> 1-619-652-0593 phone
> http://www.piclist.com
>
> ----- Original Message -----
> From: Kyodo Comunicaciones <kyodolab@infonegocio.com>
> To: <jamesnewton@piclist.com>
> Sent: Friday, February 23, 2001 10:45
> Subject: Form posted from Mozilla
>
>
> input=
> output=
> desc=RS-485 serial communications software
> cpu=16F871
>
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