MR52-S3 | Mercury Security dual-door sub-controller, 2 readers, 8 inputs, 6 relays, RS-485 communication

Mercury Security · PLCs & Industrial Controllers

Description  The Mercury MR52-S3 is a dual-door sub-controller designed to expand access control systems with reliable I/O and multi-reader support. This part number provides interfaces for two card readers, eight monitored inputs, and six Form C relays for door and auxiliary control. Its RS-485 communication architecture allows seamless integration with Mercury EP series intelligent controllers.     Technical Specifications  Condition New/Never Used Surplus Brand Mercury Security Category Sub-Controller Part Number MR52-S3 Subcategory Access Control Expansion Module Type Dual-door sub-controller Primary Power 12–24 VDC ±10%, 150 mA max Readers Supported 2 Inputs 8 standard monitored inputs Outputs 6 Form C relays, 5 A at 30 VDC Communication RS-485 required Reader Technologies Wiegand, F/2F, OSDP Secure Channel Compatibility Mercury EP series controllers Security Features AES-128/256 encrypted communication; onboard cryptographic memory Installation Same footprint as MR52 Series 2 Auxiliary I/O 4 auxiliary inputs and 4 auxiliary outputs (board-level)     Information About MR52-S3 The MR52-S3 is part of Mercury Security’s Series 3 sub-controller lineup, engineered to extend door control capability within enterprise access systems. Designed as a direct replacement for the MR52 Series 2, it retains the same footprint and interface, enabling straightforward upgrades without reprogramming. The unit supports multiple reader technologies—including Wiegand, F/2F, and OSDP with Secure Channel—and provides additional auxiliary inputs and outputs for flexible device integration. Typical applications include two-door access control, secure facility management, and system expansion where encrypted communication and high I/O density are required. Key Features: Two-Door Sub-Controller: Supports 2 readers and complete door I/O for controlled entry points. Eight Standard Inputs: Enables monitoring of door position switches, REX devices, and auxiliary points. Six Form C Relays: Provides 5A-rated relay outputs for locks, alarms, or automation control. RS-485 Connectivity: Ensures secure, encrypted communication with Mercury EP controllers. Multi-Technology Reader Support: Compatible with Wiegand, F/2F, and OSDP Secure Channel readers. Series 2 Footprint Match: Directly replaces the MR52 Series 2 without wiring or software changes. Integrated Cryptographic Module: Protects encryption keys and enhances system data security. The MR52-S3 delivers the reliability and precision required for scalable, secure access control expansion.

Brand: Mercury Security · Category: PLCs & Industrial Controllers

Key features

• Two-Door Sub-Controller: Supports 2 readers and complete door I/O for controlled entry points.
• Eight Standard Inputs: Enables monitoring of door position switches, REX devices, and auxiliary points.
• Six Form C Relays: Provides 5A-rated relay outputs for locks, alarms, or automation control.
• RS-485 Connectivity: Ensures secure, encrypted communication with Mercury EP controllers.
• Multi-Technology Reader Support: Compatible with Wiegand, F/2F, and OSDP Secure Channel readers.
• Series 2 Footprint Match: Directly replaces the MR52 Series 2 without wiring or software changes.
• Integrated Cryptographic Module: Protects encryption keys and enhances system data security.

Specifications

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