Re: Serial protocol questions

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

Hi Andy


> I've never done anything with RS485, but if this stuff is being
connected
to a PC (for db lookups I presume in the case of the card reader) then why
not implement the xpl side as PC software, allowing your 485 network to
pootle along with little interruption...

Yep  this can be done , but the devices on the rs485 network  require to be
polled unless some fancy collision detection is built into the devices as
they all may want to speak at the same time ....

My thoughts were to have a smart xpl- rs485 gateway and it would poll the
devices to ensure all is ok and pass hbeats and status changes back to
xpl...Likewise it would pass xPL messages to the intended target........

> The above may clearly highlight my lack of 485 knowledge... appologies
in
advance

Join the club ;-))

Frank


----- Original Message -----
From: "UKHA" <ukha@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Sunday, January 23, 2005 9:28 AM
Subject: Re: [ukha_xpl] Serial protocol questions


>
>
> On 23/01/2005 at 08:10 Frank Mc Alinden wrote:
>
> >Hi All
> >            Can we have some more input please on how we could
implement
> >rs485 networks in an xPL enviroment....
> >Thanks
> >Frank
> >
>
> I've never done anything with RS485, but if this stuff is being
connected
to a PC (for db lookups I presume in the case of the card reader) then why
not implement the xpl side as PC software, allowing your 485 network to
pootle along with little interruption...
>
> The above may clearly highlight my lack of 485 knowledge... appologies
in
advance..
>
>
> Andy
>
>
>
>
> xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
http://www.xpl.myby.co.uk
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>
>
>
>
>
>



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