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Mercury MR52 Reader Interface

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MR52 Reader Interface

Flag notes: Guide text says SIO RS-485 on TB10; board drawing shows RS-485 on TB6 and relays on TB10. Data follows the drawing.

Osdp reader Wiegand reader Clock data F2f Supervised input 1k 1k Unsupervised input Relay fail secure Relay fail safe
Mercury MR52Mercury MR52 Osdp reader. TB7 VIN, VOUT, GND connects to 12–24 VDC ±10% in; VOUT = VIN pass-through. TB6 TR+, TR−, GND connects to 2-wire to Mercury controller; two NC positions unused. TB1–TB4 IN1–IN8 connects to Two terminals per input; unsupervised or 1k/1k 1% supervised. TB5 TMP, GND connects to Cabinet tamper, NC, no EOL; jumper if unused. TB5 PFL, GND connects to Power fault, NC, no EOL; jumper if unused. TB8 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND connects to TTL D1/D0 or Clock/Data, F/2F, or 2-wire RS-485 OSDP. TB9 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND connects to Same as reader 1. TB10 RLY1–RLY2 NO, C, NC connects to Form C, NO 5 A / NC 3 A @ 30 VDC. TB11 RLY3–RLY4 NO, C, NC connects to Form C. TB12 RLY5–RLY6 NO, C, NC connects to Form C. J4 connects to RS-485 termination; end units only. J1 connects to Reader power: 12V (needs VIN >20 VDC) or PT pass-through.Mercury MR52Osdp readerPowerTB7 VIN, VOUT, GND12–24 VDC ±10% in; VOUT = VIN…RS-485 (SIO)TB6 TR+, TR−, GND2-wire to Mercury controller;…InputsTB1–TB4 IN1–IN8Two terminals per input; unsu…TB5 TMP, GNDCabinet tamper, NC, no EOL; j…TB5 PFL, GNDPower fault, NC, no EOL; jump…Reader 1TB8 VO, LED, BZR, D1/CLK/…TTL D1/D0 or Clock/Data, F/2F…Reader 2TB9 VO, LED, BZR, D1/CLK/…Same as reader 1RelaysTB10 RLY1–RLY2 NO, C, NCForm C, NO 5 A / NC 3 A @ 30…TB11 RLY3–RLY4 NO, C, NCForm CTB12 RLY5–RLY6 NO, C, NCForm CJumperJ4RS-485 termination; end units…J1Reader power: 12V (needs VIN…
Mercury MR52 Osdp reader. TB7 VIN, VOUT, GND connects to 12–24 VDC ±10% in; VOUT = VIN pass-through. TB6 TR+, TR−, GND connects to 2-wire to Mercury controller; two NC positions unused. TB1–TB4 IN1–IN8 connects to Two terminals per input; unsupervised or 1k/1k 1% supervised. TB5 TMP, GND connects to Cabinet tamper, NC, no EOL; jumper if unused. TB5 PFL, GND connects to Power fault, NC, no EOL; jumper if unused. TB8 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND connects to TTL D1/D0 or Clock/Data, F/2F, or 2-wire RS-485 OSDP. TB9 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND connects to Same as reader 1. TB10 RLY1–RLY2 NO, C, NC connects to Form C, NO 5 A / NC 3 A @ 30 VDC. TB11 RLY3–RLY4 NO, C, NC connects to Form C. TB12 RLY5–RLY6 NO, C, NC connects to Form C. J4 connects to RS-485 termination; end units only. J1 connects to Reader power: 12V (needs VIN >20 VDC) or PT pass-through.

Terminals Flag

TerminalGroupFunctionConnects to
TB7 VIN, VOUT, GND Power 12–24 VDC ±10% in; VOUT = VIN pass-through Flag
TB6 TR+, TR−, GND RS-485 (SIO) 2-wire to Mercury controller; two NC positions unused Flag
TB1–TB4 IN1–IN8 Inputs Two terminals per input; unsupervised or 1k/1k 1% supervised Flag
TB5 TMP, GND Inputs Cabinet tamper, NC, no EOL; jumper if unused Flag
TB5 PFL, GND Inputs Power fault, NC, no EOL; jumper if unused Flag
TB8 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND Reader 1 TTL D1/D0 or Clock/Data, F/2F, or 2-wire RS-485 OSDP Flag
TB9 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND Reader 2 Same as reader 1 Flag
TB10 RLY1–RLY2 NO, C, NC Relays Form C, NO 5 A / NC 3 A @ 30 VDC Flag
TB11 RLY3–RLY4 NO, C, NC Relays Form C Flag
TB12 RLY5–RLY6 NO, C, NC Relays Form C Flag
J4 Jumper RS-485 termination; end units only Flag
J1 Jumper Reader power: 12V (needs VIN >20 VDC) or PT pass-through Flag

Key specs

Power12–24 VDC ±10%, 550 mA max excluding readers
Power wire18 AWG min
Sio2-wire RS-485, 4,000 ft, 24 AWG shielded twisted pair, 120 Ω
Reader power300 mA max per port
Reader cableTTL 6-cond 18 AWG 500 ft; F/2F 4-cond 18 AWG 500 ft; RS-485 24 AWG shielded 2,000 ft
Inputs8 + tamper + power fault; 1k/1k 1% EOL; 30 Ω max loop
Relays6 Form C; NO 5 A @ 30 VDC, NC 3 A @ 30 VDC
Dimensions6 x 8 x 1 in
Temp0–70 °C

12 VDC board power: J1 must be on PT

Contact protection diode (1N4002 typical) within 12 in of inductive loads

OSDP >200 ft or EMI: 120 Ω across RS-485 ends

Board earth ground connections required

How to wire it

  1. Connect TB7 VIN, VOUT, GND to 12–24 VDC ±10% in; VOUT = VIN pass-through.
  2. Connect TB6 TR+, TR−, GND to 2-wire to Mercury controller; two NC positions unused.
  3. Connect TB1–TB4 IN1–IN8 to Two terminals per input; unsupervised or 1k/1k 1% supervised.
  4. Connect TB5 TMP, GND to Cabinet tamper, NC, no EOL; jumper if unused.
  5. Connect TB5 PFL, GND to Power fault, NC, no EOL; jumper if unused.
  6. Connect TB8 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND to TTL D1/D0 or Clock/Data, F/2F, or 2-wire RS-485 OSDP.
  7. Connect TB9 VO, LED, BZR, D1/CLK/TR+, D0/DAT/TR−, GND to Same as reader 1.
  8. Connect TB10 RLY1–RLY2 NO, C, NC to Form C, NO 5 A / NC 3 A @ 30 VDC.
  9. Connect TB11 RLY3–RLY4 NO, C, NC to Form C.
  10. Connect TB12 RLY5–RLY6 NO, C, NC to Form C.
  11. Connect J4 to RS-485 termination; end units only.
  12. Connect J1 to Reader power: 12V (needs VIN >20 VDC) or PT pass-through.

Source

Mercury MR52-S3 Reader Interface Installation and Specifications · PLT-05248 rev A.5 (Sep 2024)

Values from PLT-05248 rev A.5 (Sep 2024).

Verify against the manufacturer's install guide.

Open in builder Program it in OnGuard

Related parts

Planning aid only. Values are typical and vary by manufacturer, code edition and jurisdiction. Verify with manufacturer data, NEC/NFPA/TIA and the local AHJ. HireLV is not liable for designs based on these tools.