PremiSys Mercury MR52-S3B Dual-Reader Interface Module — Used, Tested

MPN: MR-52S3B

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 PremiSys Mercury MR52-S3B is a dual-reader interface module that expands an IDenticard PremiSys access control system, adding two doors' worth of reader, input, and relay capacity downstream of a Mercury intelligent controller. Because PremiSys is built on the Mercury hardware platform, this standard MR52-S3B integrates natively — the correct expansion board whether you are growing an existing PremiSys installation or adding doors to a new one. 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 general-purpose supervised inputs for door contacts, request-to-exit devices, and alarm points, and six Form-C relay outputs for strike control and signaling, with support for up to eight card formats. As a Series 3 (S3) board it carries Mercury's updated processor and enhanced onboard security. Operates on 12–24 VDC. Backed by our 1-year hardware guarantee.