The MD-D02B is a plug-in expansion module for Rosslare’s AC-225x-B access control panels that provides a 2-reader interface, 4 supervised inputs with end-of-line (EOL) resistor protection, and 4 relay outputs (5 Amp Form-C N.O./N.C.) to the panel. Installation of the module takes under one minute with the tailored expansion port in the panels and auto-recognize by the panel. Once it is installed and the panel is powered on, the expansion is recognized by the AxTraxNG server, and the MD-D02B can be programmed for access control and automation. Advanced communication with the controller allows for firmware update and real-time event logging, with support for full offline operation by the host panel.