Re: Re: RS485 - XPL on the wire

["Mal Lansell" <mlansell@xxxxxxxxxxxxxx>]

Arrghh - don't make me go to Dontronics - I'll spend all day finding uses
for all those great little gadgets again!
As for how to operate an rs485 network I have no clue - I've never really
looked into it.

Mal




----- Original Message -----
From: "Frank Mc Alinden" <fmcalind@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Friday, October 22, 2004 9:59 AM
Subject: Re: [ukha_xpl] Re: RS485 - XPL on the wire


>
> 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
> > 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
>
>
>
>
>
>
>