The Xantech XCARD is an individual zone PCB card for use in the EXP9 Zone
Expander. It allows field expansion to more zones if the EXP9 was initially
bought with less than the full 9 cards factory installed (i.e. the client later requests
more zones). The XCARD can also be used as a field replacement for the zone
cards in both the ZPR68-10 and the EXP9.