RS485 Access Controller Style: 4 Door Board Description A core access control board designed for small to large facilities. The controller supports RS485 communication and robust offline operation, with flexible door and reader configurations. It integrates with Access and SQL databases and provides reliable event storage and power interruption protection for continuous security management. Key benefits Reliable offline protection and data retention through speed memory so records are not lost during power interruptions. Scalable deployment with no limit on the number of controllers, suitable for singledoor setups up to multidoor systems. Remote control and monitoring capability via mobile app for convenient management and faster response. Comprehensive security features including antisubmarine and antitracking, Doka opendoor, and illegal breakin alarm to reduce unauthorized access and tailgating risks. Main features and specifications Supported database: Access and SQL Communication: RS485 input format Style and door configurations: available in 1door, 2door, and 4door board versions; choose the specification that fits the site Reader connections: depending on model, supports up to two readers for a 1door board and up to four readers for 2door and 4door boards Card reading frequencies: 125 KHz and 13.56 MHz Max reader distance to controller: 100 m (recommended 80 m) Power supply (board): DC 12 V input, 4 to 7 A Circuit board power consumption: less than 100 mA Optional metal power supply box: input AC 110 V to 240 V, output DC 12 V 5 A, can connect a battery and also serves as cabinet for the control board Controllable gate outputs: available in 1door, 2door, and 4door output specifications Door opening time extension: adjustable from 1 to 600 seconds User capacity: up to 20,000 users Offline event storage: up to 100,000 event buffers Power interruption protection: speed memory preserves records Environmental limits: operating temperature 40 C to 70 C, operating humidity 10 percent to 90 percent RH without condensation Advanced access controls: remote open door support, anti passback, antitailgating, multicard open door Compatibility and system role Core component of a complete access control system; integrates with locks, readers, exit buttons, and power supplies sold separately Works with standard RS485 readers and supports common card frequency standards Typical applications Office buildings: manage multidoor entry points across floors and departments with centralized database support and event logging Warehouses and logistics centers: control access to loading docks and storage areas with long reader cable runs and batterybacked power supply options Residential complexes and gated communities: implement antitailgating and antipassback rules while enabling remote door release for management staff What is included and optional Controller board in chosen door configuration Optional metal power supply box available to power the system and act as the enclosure; power box supports battery connection and provides DC12V 5A output Readers, locks, exit buttons, and other accessories are available separately to build a complete access control solution Technical notes For communication reliability, keep reader cable runs near the recommended 80 m distance when possible Select the board version that matches the number of doors and readers required at the site Use Access or SQL database systems for user and event management This RS485 Access Controller delivers flexible door control, robust offline storage, and remote management to support secure and scalable access control installations.