Re: Re: RS485 - XPL on the wire

["Frank Mc Alinden" <fmcalind@xxxxxxxxxxxxxx>]

Hi Lehane / Ian

Like Ian  I am also interested in xpl 485 enabling stuff...But
to develope stuff we need to get more feedback from xPL Users on the sort
of
devices that they would like....Would be nice if several rs485
developements
going on at the same time by different people.....I think there would need
to be a RS232 / 485 convertor made  which means one side would have to be
bit banged , not aware of any pics with  2 uarts ??or a commercially
available unit ?? .............Have done a little bit on rs485 and used the
chksum as you decribed.............Im more than happy to get involved in
rs485 projects if  others are and there is enough interest as well......

This link mentions the rs485 stuuf i was playing with
http://skybax.rapidhoster.co.uk/~armagh/page10.html

Frank


----- Original Message -----
From: "g8kmh" <lehane@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Friday, October 22, 2004 1:49 AM
Subject: [ukha_xpl] Re: RS485 - XPL on the wire


>
>
> OK,
> I'd missed xpl_devcom in my searches, oops!
>
> LRC-8 is a simple checksum on the message. XOR everything after STX
> including ETX and the result is the checksum. No big deal to do and
> offers some protection against message corruption, which since the
> RS485 is going to be around mains cabling (even taking into account
> normal separations) I think is a reasonable precaution.
>
> Be interested in the PIC implementations....
>
> Thanks,
> Lehane
>
> <snipped>
>
>
>
>
>
>
> xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
http://www.xpl.myby.co.uk
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