HID Mercury MR52-S3 Installations And Specifications page 4

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1.1 MR52 reader interface
The MR52 reader interface boards provide a solution to the OEM system integrator for interfacing to TTL
(D1/D0, Clock/Data), F/2F, 2-wire RS-485 device and door hardware. The MR52 provides a tristate LED
control, and buzzer control.
Six Form-C relay outputs are provided that can be used for strike control or alarm signaling.
Eight inputs are provided that can be used for monitoring the door contact, request to exit push button, and
alarm contacts. Input circuits can be configured as unsupervised or supervised.
The MR52 communicates to the controller via a 2-wire RS-485.
For component location see below (some components shown are not present on the MR52).
PLT-05248, A.2
HID Mercury™ MR52-S3 Reader Interface
4
Installation and Specifications
June 2021