The Openpath Core Series Smart Hub is a modular access control unit that supports up to four Openpath Smart Readers. The Core Series Smart Hub features the Access Control Core (OP-ACC), that securely makes all entry decisions. The Core connects to expansion boards that include ports for Openpath Smart Readers, Request to Exit (REX) inputs and Contact Sensors. The Core Series Smart Hub uses RS-485 wiring to connect to the Smart Readers and is powered by a built-in 12/24VDC power supply.