The Biomax SA72 standalone keypad access control terminal is engineered for flexible deployment across commercial, institutional, and industrial electronic locking architectures. Equipped with native Wiegand connectivity and standardized low-voltage DC switching outputs, the device functions seamlessly as an autonomous single-door access controller or as a credential interface integrated into broader supervisory security networks.
Wiegand 26 (WG26) System Controller & Reader Interfacing
The unit features standardized Wiegand 26-bit (WG26) protocol compatibility across both dedicated input and dedicated output wiring channels. When operating as a standalone master station, the WG26 input allows system integrators to wire a secondary external slave reader (such as an auxiliary exit reader) to manage bidirectional entry and exit verification over a single doorway.
Alternatively, utilizing the WG26 output channels allows the Biomax SA72 to be deployed as a peripheral credential reader connected directly to third-party access control panels or multi-door controllers. In this secondary mode, credential read events—including proximity card transmissions and numeric keypad inputs—are converted directly into 26-bit data packets for central host verification and processing.
RFID Credential and User Capacity Compatibility
The integrated RF frontend supports standard Proximity cards and keyfobs, providing reliable contact-free credential capture at a designated reading range of 2 to 5 cm. System access verification can be configured to match site-specific security policies using three distinct authentication modes:
- Card Only: Direct presentation of standard Proximity credentials within the 2 to 5 cm detection zone.
- Code Only: Numeric PIN entry through the integrated digital backlit keypad.
- Card + Code: Dual-factor authentication requiring sequential proximity credential presentation followed by personal PIN confirmation.
The internal identity registry supports up to 2,000 users without requiring external memory boards or connected computer hosts.
Lock Hardware & Switched Output Electrical Compatibility
The internal switching circuit of the SA72 provides direct voltage and relay control for industrial door hardware installations. The lock output supports a maximum steady-state load of 1 A (less than or equal to 1 A), making it fully compatible with DC 12V electronic locking devices such as electric strikes, fail-secure or fail-safe magnetic locks, and motor-driven drop bolts.
To safeguard electrical subsystems from inductive field spikes or installation wire shorts, the lock output circuit incorporates ultra-fast short-circuit protection capable of isolating the output within 100 microseconds (≤ 100 μs). The door release unlock duration is field-programmable across an adjustable range from 0 to 99 seconds, matching the operational latch requirements of latch bolts, swing doors, and automated turnstile barriers.
Auxiliary Alarm Circuits and Power Requirements
The Biomax SA72 includes high-capacity auxiliary alarm output contacts rated to switch loads up to 20 A (≤ 20 A). This high-current threshold ensures electrical compatibility with high-draw external signaling devices, including industrial strobes, high-decibel buzzers, and automated sirens, without requiring interposing relays.
| Subsystem Interface | Compatibility Specification | Operational Parameters |
|---|---|---|
| Power Supply Input | DC 12V Regulated | Idle current ≤ 30 mA |
| Credential Reader | Proximity RFID Cards / Fobs | 2 to 5 cm read range; 2,000 user capacity |
| Data Bus Protocol | Wiegand 26 (WG26) | Bi-directional: Dedicated WG26 Input and WG26 Output |
| Electric Lock Control | Direct 12V Lock Output | Load capacity ≤ 1 A; short-circuit protection ≤ 100 μs |
| Relay Timing | Adjustable Unlock Delay | 0 to 99 seconds configurable cycle |
| Alarm Output Contact | Dedicated External Alarm Circuit | Switched load handling ≤ 20 A |
| Ambient Deployment | Industrial Extended Range | -40 °C to 60 °C; 0% to 95% non-condensing humidity |
The compact 45 mm x 110 mm x 22 mm narrow-profile mullion form factor allows surface mounting on standard door frame extrusions and narrow architectural surfaces, operating reliably across temperature ranges from -40 °C to 60 °C and relative humidity levels up to 95% non-condensing.
