The Lattice proximity (RFID) access control system offers a really affordable and secure solution for tracking, controlling and monitoring the movement of staff and/or visitors in to and out of premises. It offers seamless expansion from a standalone 1000 tag reader (ZAPtags), all the way up to a fully-fledged 32 reader network system with a sophisticated PC interface delivering advanced management and reporting capabilities. By combining two readers, both directions of traffic flow can be controlled through up to 16 doors. Up to seven levels of anti-pass back can also be set up for each individual tag. Each access control reader provides a potential-free output or secure link via the optional “SmartSwitch” interface module to activate either a door lock, gate motor, traffic barrier, etc. The “door sense” input on each reader will monitor whether the door has been left open or even forced, activating a local buzzer or triggering an third party alarm. The readers are weatherproof with surface- and flush-mount options.