Mercury™MR16IN-S4 Input Interface Module

The HID Mercury MR16IN-S4 Input Interface Module is a high-capacity monitoring expansion panel designed to extend the input capability of Mercury-based physical access control systems. It provides 16 individually configurable supervised or unsupervised inputs, allowing connection of devices such as door-position contacts, request-to-exit sensors, glass-break detectors, temperature sensors, intrusion contacts and other security monitoring points. Two additional unsupervised inputs are provided for functions such as cabinet tamper and battery-failure monitoring, while 2 Form-C relay outputs can be used for programmable control functions. The MR16IN-S4 communicates with a Mercury Intelligent Controller over RS-485 at 38,400 or 115,200 bps and supports AES-256 encrypted controller-to-I/O communication. As part of Mercury’s new S4 generation, it also incorporates enhanced secure hardware, SESIP L2-certified cryptography, PQC-capable security architecture and greater processing headroom, making it suitable for enterprise, data-centre, commercial and high-security installations requiring dependable monitoring expansion. The wider Mercury SIO and control-hardware family allows the access-control architecture to be expanded according to the required doors, readers, inputs and outputs. The current MR16OUT-S4 provides 16 Form-C relay outputs for controlling locks, sirens, indicators, elevators and other external devices, while legacy MR16OUT and MR16OUT-S3 products provide similar high-density output functionality in earlier Mercury generations. For door and reader expansion, the MR52 / MR52-S3 / MR52-S3B family supports 2 reader interfaces, 8 general-purpose inputs and 6 Form-C relay outputs, with reader support including OSDP Secure Channel, Wiegand, biometric devices, keypads and other credential technologies. The newer MR54-S4 significantly increases density by supporting 4 doors and up to 8 readers, with up to 12 inputs, while the compact MR50 / MR50-S4 is optimized for single-door applications and the MR50-S4 supports 1 door, up to 2 readers, 2 supervised/unsupervised inputs and 2 Form-C relays. This modular approach enables designers to mix high-density input/output panels and reader interfaces under Mercury MP-series intelligent controllers without replacing the overall system architecture as requirements grow. VEGA Digital IT Solutions LLC provides the Mercury MR16IN-S4, MR16OUT-S4, MR52/MR52-S3/MR52-S3B, MR54-S4, MR50/MR50-S4 and associated HID Mercury access-control hardware as a professional vendor and system integrator across Dubai and the UAE. VEGA Digital can design and install complete Mercury solutions using MP1501, MP1502, MP2500 and MP4502 intelligent controllers, HID Signo readers, OSDP and Wiegand devices, biometric terminals, electromagnetic locks, electric strikes, door contacts, request-to-exit devices, alarm sensors, elevator interfaces and enterprise network infrastructure. Services include controller and enclosure selection, RS-485 topology design, input supervision and EOL resistor configuration, OSDP Secure Channel setup, reader and lock wiring, relay programming, cabinet tamper and battery monitoring, anti-passback and access-rule configuration, elevator and alarm integration, testing, commissioning, troubleshooting and future expansion. This enables customers to deploy a secure, open-architecture and highly scalable Mercury access-control platform ranging from individual monitored doors to large multi-building enterprise systems while preserving compatibility with existing Mercury infrastructure.