Serial protocol questions

[ben@xxxxxxxxxxx]

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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