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Compact rectangular interface module with front card slot and side terminals

MERCURY

MERCURY MR50-S3 Single Card Reader Interface Module handheld pcs accessory

SKU CH-0MSV-2WEQ1 MPN MR50-S3

Connects a single card reader via RS-485 with two programmable relays, two general-purpose inputs, tamper monitoring and keypad support for Mercury, Dorado and HID formats

  • Reliable power delivery from 12 to 24 VDC supply
  • Long-distance RS-485 communication up to 4000 feet
  • Flexible relay control with 5A and 2A contact ratings
  • Operates in extreme temperatures from -40 to 75°C
  • Supports multiple keypad formats including Mercury and HID

Interface Module

The Mercury MR50-S3 is a single card reader interface module designed for access-control integrators who need to connect a Mercury-compatible reader to an RS-485 host bus. It suits new installations or retrofit projects that require a compact, DIN-rail mountable controller with on-board relay outputs and programmable inputs for door monitoring and tamper detection.

Build and Connectors

The unit operates from 12-24 VDC with a 150mA maximum draw and passes the input voltage through to power the attached reader. Host communication uses a 2-wire RS-485 link rated for 4,000 feet on shielded twisted-pair cable such as Belden 9841. Two output relays provide a normally open 5A contact at 30 VDC and a 2A resistive contact at 30 VDC, while two general-purpose inputs and one dedicated tamper input accept programmable circuit types for flexible wiring.

Environmental Tolerance

The module is rated for operational temperatures from -40 to 75° C and storage temperatures from -55 to 85° C, allowing deployment in unheated vestibules or outdoor enclosures. Humidity tolerance spans 5 to 95% RHNC without condensation, so the board tolerates condensing environments when correctly enclosed. With no moving parts or active cooling, the solid-state design runs silently and draws minimal power during normal access-control cycles.

Highlights

  • Reliable power delivery from 12 to 24 VDC supply
  • Long-distance RS-485 communication up to 4000 feet
  • Flexible relay control with 5A and 2A contact ratings
  • Operates in extreme temperatures from -40 to 75°C
  • Supports multiple keypad formats including Mercury and HID

Specifications

No published specifications for this item yet.

Questions about this item

What RS-485 cable length does the MR50-S3 support?

The module communicates over 2-wire RS-485 up to 4,000 feet using twisted-pair shielded cable such as Belden 9841.

What voltage range does the MR50-S3 require?

It operates on 12 to 24 VDC with a 10 % tolerance and draws a maximum of 150 mA.

How are the output relays on the MR50-S3 wired?

Relay 1 provides a normally open contact rated at 5 A / 30 VDC; Relay 2 is rated at 2 A / 30 VDC resistive.

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