Mercury MR52-S2 Dual-Reader Interface Module (Used)

MPN: MR52-S2

Used: fully function-tested before shipping. We visually inspect the board, load the approved firmware for the listed platform when applicable, power it at rated input, verify applicable inputs, outputs, relays, and communications on a test fixture, complete the documented burn-in procedure, and record the serial number before packing. The Mercury MR52-S2 is a Series 2 dual-reader interface module that expands a Mercury-based access control system, adding two doors' worth of reader, input, and relay capacity downstream of a Mercury intelligent controller. It connects to the master controller over a 2-wire RS-485 bus, so you extend door capacity across a facility without home-running every reader back to the panel. Each board supports two card readers, eight supervised inputs for door contacts, request-to-exit devices, and alarm points, and six Form-C relay outputs for strike control and signaling. As proven Authentic Mercury hardware, the MR52 platform is used across a wide range of OEM access control systems, making this a cost-effective way to expand or maintain an existing Series 2 deployment. This is a used unit, professionally tested and backed by our 1-year hardware guarantee.