2.3 Reader wiring
Each reader port supports a reader with TTL (D1/D0, Clock/Data), F/2F, or 2-wire RS-485 signaling. Power to
the reader is selectable: 12 V DC (VIN must be greater than 20 V DC), or power is passed-through (PT) from
the input voltage of the MR52 (TB7-VIN), 300 mA maximum per reader port. Readers that require different
voltage or have high current requirements must be powered separately. Refer to the reader manufacture
specifications for cabling requirements. In the 2-wire LED mode the buzzer output is used to drive the second
LED. Reader port configuration is set via the host software.
To fully utilize each reader port:
n TTL signaling requires a 6-conductor cable (18 AWG).
n F/2F signaling requires a 4-conductor cable.
n RS-485 signaling requires two 2-conductor cables. Use one cable for power (18 AWG) and one cable for
communication (24 AWG, with drain wire and shield).
Note: For OSDP cable lengths greater than 200 ft (61 m) or EMF interference, install 120Ω +/- 2Ω resistor
across RS-485 termination ends.
Note: Data 0 and Data 1 wires for Wiegand may be reused for OSDP. However, standard Wiegand cable may
not meet RS-485 twisted pair recommendations. The reuse of cable works best on shorter cable
lengths at lower data rates.
J1 – Reader port power select
12V PT Reader power
12 V DC is available on reader ports (VIN > 20 V DC)
VINpower is "Passed Through" to reader ports
Caution: If the input voltage to the MR52 is 12 V DC, jumper J1 MUST be in the PT position.
Input power Reader power select Reader output Notes
24 V DC Pass-through 24 V DC
24 V DC 12 V DC 12 V DC
12 V DC Pass-through 12 V DC
12 V DC 12 V DC 0 V DC Caution: Do not use
PLT-05248, A.2 7 June 2021
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HIDMercury™ MR52-S3 Reader Interface
Installation and Specifications
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