Rosslare Security Products MD-D04B Security Devices

MD-D04B is a plug-in expansion module for Rosslare's AC-425-B networked access control panels that adds four reader interfaces and expands door capability, supporting up to two bidirectional doors (or four unidirectional doors) per module to scale access control without replacing the host controller. The module provides four supervised inputs with end-of-line protection and four Form-C relay outputs rated at 5 A, all powered by the panel's 12 VDC supply, enabling integration of door strikes, request-to-exit devices, alarms, and other peripheral circuits from a single expansion card. Reader communications can be either Wiegand or Clock-and-Data, and the board includes LED status feedback for 12 V power and relay activation; installation is streamlined by auto-recognition by AC-425-B/AC-425IP-B panels and compatibility with Rosslare AxTraxNG/AxTraxPro software. Weighing about 98.2 g (0.21 lb), the MD-D04B is designed for a single-module-per-controller deployment, ensuring a compact upgrade path for growing access-control needs.