Door Control Panel Spare PCB Assembly. This versatile access controller serves two readers controlling up to 4 doors and provides a highly cost-effective solution for access control and integrated security system requirements. Operate on distributed intelligence principle ­ with all system parameters contained in the controller. Use in conjunction with EXgarde® PRO to provide a complete, fully configured access control solution. Full functionality maintained during parameter upload, resulting in disruption-free operation. PCBs are supplied as spares only. UID of original PCB is required upon order.