Re: Re: RS485 - XPL on the wire

["Mal Lansell" <mlansell@xxxxxxxxxxxxxx>]

There are RS485 adaptors that connect to RS232 or USB ports available for
around the £35 mark.
http://www.bb-elec.com/

Or a UK alternative
http://www.easysync.co.uk/products.html

Of course, there are also RS485 PCI cards too.

I presume an RS485 interface shows up as a COM port in Windows?

Mal



----- Original Message -----
From: "Frank Mc Alinden" <fmcalind@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Friday, October 22, 2004 8:06 AM
Subject: Re: [ukha_xpl] Re: RS485 - XPL on the wire


>
> 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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> >
> >
> >
> >
> >
> >
> >
>
>
>
>
> xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
http://www.xpl.myby.co.uk
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