PremiSys Mercury MR52-S3B Dual-Reader Interface Module - Refurbished

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.