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Keri Systems MR50 User Manual

Mr50 reader interface, Installation and specifications: 1. general, Power, reader and door hardware wiring

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Mercury Security Corporation © 2014

MR50

DOC 10107-0009

REV 2.03

Page 1

www.mercury-security.com

2355 MIRA MAR AVE. LONG BEACH, CA 90815-1755, (562)986-9105 FAX (562) 986-9205

This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.

MR50 READER INTERFACE

Installation and Specifications:

1. General:

The MR50 reader interface provides a solution to the OEM system integrator for interfacing to a
TTL/Wiegand/RS-485 type reader and door hardware. The MR50 can accept data from a reader with
clock/data, Wiegand signaling or 2-wire RS-485, also provides a tri-stated LED control and buzzer
control. Two Form-C contact relay outputs may be used for strike control or alarm signaling. Two
inputs are provided for monitoring the door contact and exit push button. Communication to the
interface is accomplished via a 2-wire RS-485 interface. The MR50 requires 12 to 24 Vdc for power.

2. Power, Reader and Door Hardware Wiring:

All interconnections to the interface are via quick-disconnect terminal blocks. The MR50 requires
filtered 12 to 24 Vdc±10% for power. The MR50 supports clock/data, Wiegand or 2-wire RS-485
reader interface signaling. Two inputs are typically used for door contact and exit push button
monitoring. End of line resistors are required for line supervision.

Note: The input power is passed through to the reader terminal strip and is available for powering a
reader. Care must be taken to insure that the input voltage is within the voltage range of the reader.

1 2 3 4 5 6 7 8

J2

TB1

GND

J3

J5

TR-

TR+

VO

D0

DAT

GND

D1

LED

CLK

BZR

TB4

J4

B A

U1

J6

TB3

TB2

K2

K1

I1

I1

I2

I2

GND

VIN

C

NC

NO

C

NO

NC

K2

K1

2.35 [

59

.7

]

2.75 [

69

.9

]

3.85 [97.8]

4.25 [108]

TAMPER INPUT, NORMALLY CLOSED

STATUS LEDs

0.20 [5.1]

0.20 [5.1]

Ш0.156 [Ш4.0]

4 PLACES

1K,1%

1K,1%

1K,1%

1K,1%

NC

NO EXIT REQUEST

NORMALLY OPEN

DOOR CONTACT

NORMALLY CLOSED

NORMALLY CLOSED
COMMON

NORMALLY OPEN
NORMALLY OPEN
NORMALLY CLOSED

COMMON
+12 to 24 Vdc INPUT VOLTAGE
INPUT VOLTAGE RETURN

STRIKE RELAY (K1)

GROUND

BUZZER

LED

DATA1/CLOCK/TR+

DATA0/DATA/TR-

READER POWER

RS-485

INTERFACE

READER

TAMPER, NC

TB4

GND

CLK

LED

D1
DAT

D0

VO

TR+

TR-

GND

BZR

TB1

I1

I2

I1

I2

GND

C

VIN

NO

NC

C

NO

NC

K1

K2

TB3

TB2

8

2

1

5

4

3

7

6

J4

J2

J3

AUX. RELAY (K2)

K1

K2

TR-

GROUND

TR+

I2

I1

SIO COMM.