Someone posted a an Omnilock WP4000 printer for sale on ebay and sited this web page describing it:
http://www.omnilock.com/Products/WP4000/wp_4000.html
Apparently Omnilock in an OEM for HP's 82240B printer and they sell them for use with their programmable door locks.
Are there other manufactures that have built interfaces to this printer and if so, does (did) HP make an interface chip for them to use in their designs?
-Katie