Re: Re: RS485 - XPL on the wire

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

Hi Mal

The easysync usb / rs485 can be sourced here in Oz from Dontronics @ around
$100.00.....
I  assume that some sort of devcom would have to be written for this...???
Also usually in a rs485 network there is a Master ..?? If not how would
messages be transmitted in an orderly fashion ...??/

Frank


----- Original Message -----
From: "Mal Lansell" <mlansell@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Friday, October 22, 2004 6:42 PM
Subject: Re: [ukha_xpl] Re: RS485 - XPL on the wire


>
> 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
> > > To Post a Message: ukha_xpl@xxxxxxx
> > > To Subscribe:  ukha_xpl-subscribe@xxxxxxx
> > > To Unsubscribe:  ukha_xpl-unsubscribe@xxxxxxx
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
> http://www.xpl.myby.co.uk
> > To Post a Message: ukha_xpl@xxxxxxx
> > To Subscribe:  ukha_xpl-subscribe@xxxxxxx
> > To Unsubscribe:  ukha_xpl-unsubscribe@xxxxxxx
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
> xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
http://www.xpl.myby.co.uk
> To Post a Message: ukha_xpl@xxxxxxx
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