The AC-425 can accommodate up to 30,000 users on a modular 8184 door, providing maximum flexibility to support your growing business.
Each AC-425 Access Control Unit (ACU) supports four different formats of readers (input and output), including the standard Wiegand 26-bit version. Facilities may have one reader per door.
The AC-425 is ready to install in a hangable and lockable metal housing with transformer, power supply/charger, buzzer and control panel.
Using the onboard RS-232, Ethernet TCP/IP, multiple local or remote room subnets can be connected to the AxTraxNG Client/Server PC software running on Microsoft Windows 98/ME and NT/2000/XP/7 operating systems.

- 20000, FIFO, history event log offline
- MD-IO84 with IO expansion, additional 8 inputs, 4 outputs
- MD-D04 with four-door extension, 4 readers with 4 inputs, 4 outputs
- On-board TCP/IP network
- The real-time clock can keep time for up to 2 weeks without power
- Optical tamper detector for case and wall tamper detection

Technical data
- ACU power supply: 12 V DC, from a built-in PS-33 regulated power supply / charging module
- Maximum current of ACU power supply: Panel output: 2 Input current limitation (PS-33); Closing output: 3 A
- Relays: 4 fully programmable 5 A, N.O. and N.C relay outputs; 4 expandable outputs with optional MD-IO84 or MD-D04
- Battery charger: 12 V sealed lead acid (SLA) up to 7 Ah (PS-33)
- Capacity: 30,000 users
- History event log size: 20,000 events
- Inputs: 4 monitored, double resistance, 2 state change inputs, Hi-impedance, active low 5 V DC; 8 supervised expandable inputs with optional MD-IO84 or 4 supervised expandable inputs with optional MD-D04
- Readers: 4 Wiegand 26/32/34/37/40 bit/C&D reader ports with tamper and LED control, 4, 6 and 8 bit keyboard transfer support
- Connectivity: RS-232/485, telephone connection (using MD-N33), onboard TCP/IP
- Networking: 32 units/subnetwork, 1023 subnets (maximum 8184 doors with MD-D04) using AxTraxNG software
- Audio/visual: Built-in sounder (alarm, bell, bell), 11 on-board and 3 P.S. LEDs
- Time zones and groups: 128 multi-segment time zones, 64 holidays, 30,000 access groups
- Special features: Interlock, first person delay, automatic relock, operation of scheduled outputs, 4 programmable location codes, extended opening hours, full interconnectivity.
- Safety modes: Normal and safe
- Firmware update: Local/Remote, using AxTraxNG PC software
- Operating temperature: 0°C ~ 49°C
- Operating humidity: 0% ~ 85%
- Size: 334mm x 264mm
- Weight: 380 g

The AC-425 is compatible with a wide range of Rosslare accessories, including a wide range of readers and accessories; two extension cards complete the AC-425: MD-IO84 and MD-D04.