The IP4 Door Controller combines a specially adapted Concept Control Module with two 2-Door Access Modules mounted in a single enclosure catering for the I/O and processing requirements Access Control, Alarm Monitoring and Automation functions for up to 4 doors and 10 areas. This enclosure also provides a low cost option if the customer requires expansion to 8 doors as a further two 2-Door Access Modules can be mounted in the same enclosure. This flexibility provides a competitive solution not only for small sites but large and multi-system sites that want a single integrated system.