Re: Serial protocol questions

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

Hi All
Can we have some more input please on how we could implement
rs485 networks in an xPL enviroment....
Thanks
Frank

----- Original Message -----
From: "Frank Mc Alinden" <fmcalind@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Sunday, January 23, 2005 8:07 AM
Subject: Re: [ukha_xpl] Serial protocol questions


>
> Hi Ben
>
>         No one that im aware of has done any xPL stuff using rs485 and
i
> have been pondering over the same questions that you are currently
asking,
> as i have some rfid readers and i intend to have a little xPL rs485
> network......
>
> > 1) Should I be implementing xpl on this device via serial?
>
> Can be done ok , but each device must generate hbeats and on a rs485
network
> ,multiple devices could send hbeats at the same time ..???
>
> > 2) What schema(s) should I be using?
>
> I would assume the control.basic..Sensor.basic could be used here
>
> > 3) Would it be better to create a proprietary protocol and have
> > someone write a plug-in interface to xpl?
>
> Yes this is another option and i have done this with my Probe
system....
> You still have the issue of devices sending data at the same time
therefore
> getting corrupted messages unless the app polls each device on the
network
> ...???
>
> > 4) What resources are available to use as a reference beside the
xpl
> > official website.
>
> No rs485 resources that im aware of ....
>
> Frank
>
>
>
> ----- Original Message -----
> From: <ben@xxxxxxx>
> To: <ukha_xpl@xxxxxxx>
> Sent: Sunday, January 23, 2005 6:24 AM
> Subject: [ukha_xpl] Serial protocol questions
>
>
> >
> >
> > I am in the midst of a project and was thinking about making the
> > device xpl compatible.
> > The device is a magnetic card reader (credit card) with and
onboard
> > relay to open an electrical door lock. The idea is you would
swipe a
> > credit card this device sends the account number to a host
computer
> > (via RS-485). The host determines if the account is allowed
access
> > and opens or denies access appropriately.
> > This device is run by a pic microprocessor.
> >
> > Questions:
> >
> > 1) Should I be implementing xpl on this device via serial?
> > 2) What schema(s) should I be using?
> > 3) Would it be better to create a proprietary protocol and have
> > someone write a plug-in interface to xpl?
> > 4) What resources are available to use as a reference beside the
xpl
> > official website.
> >
> > Thanks!
> >
> >
> >
> >
> >
> >
> > 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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> > 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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>
>
>
>
>
>
>



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