Re: Serial protocol questions

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

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
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>



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