MD-D04 AC425 Four Reader Expansion Board Access Control Module

Rosslare MDD04 Four Reader Expansion Board (AC425 Compatible) from Rosslare is designed to expand the capabilities of the AC-425 networked access controller, delivering enhanced flexibility for residential and commercial access control installations. Supporting four additional readers, four doors, four relay outputs, and four supervised inputs, the MDD04 expansion board provides a cost-effective and scalable solution for growing security systems. :contentReference[oaicite:0]{index=0}

Advanced Expansion for Access Control Systems

Built for seamless integration with Rosslare’s advanced controller platform, the MDD04 enables installers to expand access management capabilities without replacing existing infrastructure. Compatible with Wiegand, Clock-and-Data keypads, proximity readers, and biometric readers, this expansion board offers installation flexibility while providing dependable communication with the host controller.

• Adds support for four additional proximity readers or keypads
• Expands system capacity with four doors, four relay outputs, and four supervised inputs
• Compatible with biometric readers and multiple transmission formats
• LED status indicators for relay activity and power monitoring
• Modular and cost-effective expansion solution

Flexible Integration and Reliable Operation

Designed for commercial and residential access control environments, the MDD04 supports configuration through Rosslare AxTraxNG software, allowing installers to customize inputs and outputs to meet project requirements. Backed by Rosslare’s international service commitment and ISO9001-certified manufacturing standards, this module delivers dependable performance for scalable security deployments.

• Commercial office buildings and facilities
• Residential access control installations
• Networked security and credential management systems
• Multi-door access expansion projects

Security professionals and system integrators seeking a reliable access control expansion module can depend on the Rosslare MDD04 Four Reader Expansion Board for flexible deployment, simplified installation, and scalable access management performance.

Technical Specifications

• Model: MDD04
• Compatibility: Rosslare AC-425 Networked Controller
• Input Voltage: 12V DC from host controller
• Input Current: 30mA standby / 135mA maximum
• Reader Ports: 4
• Inputs: 4 supervised inputs
• Relay Outputs: 4 × 5A Form-C relays (N.O., N.C., COM)
• Reader Compatibility: Wiegand, Clock-and-Data, keypad, and biometric readers
• Reader Output Voltage: 12V DC
• Maximum Reader Current: 300mA
• LED Control Output: Open collector, active low
• Tamper Output: Optical anti-tamper sensor, 5V DC maximum
• Dimensions: 4.52 × 2.98 × 1.28 in (115 × 75.9 × 32.5 mm)
• Warranty: 2-Year Limited Warranty