The Biomax C-24 four-door access controller is engineered for centralized physical security infrastructure, coordinating up to 4 doors and supporting up to 8 card readers for bidirectional access tracking. Proper field installation requires adherence to mechanical clearances, power tolerances, transmission distance thresholds, and terminal interfacing guidelines.
Mechanical Mounting and Environmental Guidelines
The bare C-24 controller board measures 212 mm (length) by 130 mm (width) by 20 mm (height). It is designed to mount securely within low-voltage equipment panels, system enclosures, or security power cabinets. When mounting the controller, ensure sufficient clearance around all perimeter screw terminal blocks to accommodate field wiring bundles and maintain adequate airflow. The installation enclosure must be situated in an environment that conforms to the controller’s operating specifications, maintaining an ambient temperature between 0°C and 70°C and a non-condensing relative humidity between 10% and 90% RH.
Power Supply Requirements
The C-24 access board requires a regulated operational input voltage of DC 9V to 14V. The internal logic and processing circuits draw a static working current of less than 300 mA (
Card Reader Cabling and Wiegand Integration
The controller features 8 reader interface terminals, allowing the assignment of 2 readers per door (entry and exit) across all 4 managed doors. The system interfaces natively with peripheral access devices utilizing standard Wiegand formats:
- Supported Reader Protocols: Wiegand 26, Wiegand 34, and Wiegand 66.
- Maximum Transmission Distance: 80 meters maximum line distance between the C-24 controller and any individual card reader.
- Wiring Recommendation: Use multi-conductor shielded cable for Wiegand Data 0, Data 1, power, and indicator lines to prevent electromagnetic interference over long cable runs.
Peripheral Inputs and Door Lock Output Interfacing
The C-24 access board is equipped with dedicated onboard terminal groups for complete four-door peripheral management:
- Relay Output Interfaces: 4 relay output groups dedicated to switching power for electronic locking mechanisms (such as magnetic locks, electric strikes, or drop bolts).
- Door Sensor Interfaces: 4 door sensor input groups for real-time door open/closed status monitoring and door-forced/held-open detection.
- Exit Button Interfaces: 4 request-to-exit (RTE) input groups designed for dry-contact push buttons.
Auxiliary Alarm Extension and Network Infrastructure
To support integrated emergency and intrusion response, the C-24 features an alarm extension interface consisting of 4 auxiliary inputs and 4 auxiliary outputs. These channels allow direct hardware integration with:
- Fire alarm panels for automated emergency door release
- Security probe alarm triggers
- Burglar alarm detection systems
- Gas alarm monitoring interfaces
Network connectivity for system configuration, cardholder database updates (supporting up to 42,000 registered cards), and offline event log synchronization (supporting up to 200,000 records) is provided via an onboard TCP/IP communication port. The maximum recommended TCP/IP cable run is 100 meters over standard network cabling connecting the controller directly to a local area network (LAN) switch or router segment.
