Real-time alarm and access control on 4-8 doors per controller. Complete database for offline operation. Up to 12 CDC4 door controllers providing 48 to 96 smart doors. Full access control functions: interlocking, user counting, high security users, anti-passback with regional Up to 32 readers per CDC4 and 6 per door. Two local data buses with configurable protocol. Compatible with secure readers, OSDP readers and wireless locks. On-board inputs, door relays, IP connection and expansion options. Extended mode operation - Access control users managed by Advisor Management. Anti-passback between all standard mode door controllers connected to Advisor Advanced.