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.
MR52 READER INTERFACE
IN1 IN2 IN3 IN4
TB1
TB2
INPUTS
TB3
IN5 IN6
TB4
IN7 IN8
TB5
TMP
GND
PFL
GND
A B 1 2 3 4 5 6 7 8 PFL R1 R2TMP
J7J8
J9
J10
J14
J13
U1
S1
12345678
READER 2
VOLEDBZRCLKDATGND
D1D0
VOLEDBZRCLKGND
D1D0
DAT
READER 1
TB8
TB9
NC NO C NC
RLY 1
CNO
RLY 2RLY 4 RLY 3
NO CNONCC NC
RLY 6 RLY 5
NO CNONCC NC
TB10
TB11
TB12
J12
K1 K2 K3 K4 K5 K6
12V PT
J2
J3
J15
2 W 4W
RS-485
TR-
R+
R-
GND
TR+
TB6
J5
J6
TB7
VIN
GND
J11
J5, J6
TERMINATOR
K1
K2
K3
K4
K5
K6
2.00 [50.80] 3.00 [76.20] 2.00 [50.80]
8.00 [203.20]
.25 [6.35] 5.50 [139.70]
6.00 [152.40]
STATUS LEDs
READER INTERFACE
DIP SWITCHES
RELAY STATUS LEDs
OUTPUTS
Ø.156 [Ø4.0]
8 PLACES
SIO COMMUNICATION
PORT, RS-485
POWER IN
12-24Vdc
INPUTS
.50 [12.70]
Installation and Specifications:
1. General:
The MR52 reader interface provides a solution to the OEM system integrator for interfacing to
TTL/Wiegand/RS-485 type readers and door hardware. The MR52 can accept data from reader with
clock/data, Wiegand or RS-485 signaling, provide a tri-stated LED control and buzzer control. Six form-C
relay outputs may be used for strike control or alarm signaling. Eight supervised inputs are provided for
monitoring the door contact, exit push button and alarm contacts. Communication to the MR52 is
accomplished via a 2-wire RS-485 interface.
The MR52 requires 12 to 24Vdc for power. See the following figure for component location.
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 1
12 TO 24Vdc
GND
VIN
+
-
TB7
TR+
TR-
R+
R-
GND
2W
4W
2-WIRE
TB6
(ONLY 2-WIRE RS-485 IS SUPPORTED)
DATA1/DATA0 – CLOCK/DATA
2-WIRE RS-485
RED (1)
WHT (3)
GRN (2)
BRN (4)
BLK (6)
ORG (5)
VO
LED
BZR
D1/CLK
D0/DAT
GND
MR-10/20 READER
ADDRESS 0
MR-DT
RS-485 MODE
9600 BAUD
READER PORT
2-WIRE RS-485
12Vdc (RED) (1)
TR+ (BLUE) (3)
TR- (GRAY) (4)
GROUND (BLACK) (2)
VO
LED
BZR
D1/CLK
D0/DAT
GND
2. Supplying Power to the MR52:
The MR52 accepts 12 to 24Vdc for power on TB7. Locate the power
source as close to the MR52 as possible. Make power connection with
minimum of 18AWG wires.
Observe POLARITY on VIN!
3. Communication Wiring (SIO Communication Port):
The MR52 communicates to a Mercury Security intelligent controller (EP2500 for example) via a 2-wire
RS-485 interface. The MR52 allows for multi-drop communication on a bus of up to 4,000 feet (1,200 m).
Use twisted pair(s) (minimum 24AWG) with shield for communication. See specifications section.
Install jumpers according to the selected configuration.
4. Reader Wiring:
Each reader port supports a reader with TTL or RS-485 interface. Power to the reader is selectable:
12Vdc, or input voltage passed through (PT), 125mA maximum per reader port. This selection is made
via jumper J2 and is made for both reader ports. For the selection of 12Vdc, the MR-52 must be powered
by a 20Vdc minimum source. For readers requiring a different voltage or current capability, they must be
powered separately.
To fully utilize each reader port, a 6-conductor cable (18AWG) is required when TTL signaling is used.
RS-485 signaling requires two 2-conductor cables. One cable for power (18AWG) and one cable for
communication (24AWG). Reader port configuration is set via host software.
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 2
NC
NO
NO
NC
1K,1%
1K,1%
1K,1%
1K,1%
IN1 IN2 IN3 IN4
DIODE SELECTION:
DIODE CURRENT RATING > 1 X STRIKE CURRENT
DIODE BREAK DOWN VOLTAGE: 4X STRIKE VOLTAGE
FOR 12Vdc or 24Vdc STRIKE, DIODE 1N4002 (100V /1A) TYPICAL
MOV SELECTION:
CLAMP VOLTAGE > 1.5 X Vac RMS
FOR 24Vac STRIKE, PANASONIC ERZ-C07DK470 TYPICAL
JUMPER
DESCRIPTION
J2
Reader Power Select
12V = 12Vdc at reader ports. *** See note below ***
PT = VIN “Passed Through" to reader ports
J3
2-Wire/4-Wire Select, install in 2W position only
J5
RS-485 Termination, install in first and last units only
J6
Factory use only
J7
Factory use only
J8
Factory use only
J9
Factory use only
J10
Factory use only
J11
Factory use only
J12
Factory use only
J13
Factory use only
J14
Factory use only
J15
Factory use only
NC
C
NO
NC
C
NO
NC
C
NO
NC
C
NO
5. Alarm Contract Wiring:
Inputs 1 to 8 may be configured to use or not to use End-Of-Line (EOL)
resistors, and for normally open or normally closed contacts. Input TMP
is used for monitoring cabinet tamper and PFL input is used power
failure monitoring. These two inputs are for contact closure monitoring
only. They do not use EOL resistor(s). Input configuration is set via host
software.
6. Control Output Wiring:
Six form-C contact relays are provided for controlling door strikes or other devices. Load switching can
cause abnormal contact wear and premature contact failure. Switching of inductive loads (strike) also
causes EMI (electromagnetic interference) which may interfere with normal operation of other equipment.
To minimize premature contact failure and to increase system reliability, contact protection circuit must be
used. The following two circuits are recommended. Locate the protection circuit as close to the load as
possible (within 12 inches [30cm]), as the effectiveness of the circuit will decrease if it is located further
away.
Use sufficiently large gauge of wires for the load current as to avoid voltage loss.
7. Jumper and DIP Switch Usage:
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 3
NOTE: The input power (VIN) must be 20Vdc minimum if the 12Vdc selection is to be used.
S8
S7
S6
S5
S4
S3
S2
S1
SELECTION
OFF
OFF
OFF
OFF
OFF
Address 0
OFF
OFF
OFF
OFF
ON
Address 1
OFF
OFF
OFF
ON
OFF
Address 2
OFF
OFF
OFF
ON
ON
Address 3
OFF
OFF
ON
OFF
OFF
Address 4
OFF
OFF
ON
OFF
ON
Address 5
OFF
OFF
ON
ON
OFF
Address 6
OFF
OFF
ON
ON
ON
Address 7
OFF
ON
OFF
OFF
OFF
Address 8
OFF
ON
OFF
OFF
ON
Address 9
OFF
ON
OFF
ON
OFF
Address 10
OFF
ON
OFF
ON
ON
Address 11
OFF
ON
ON
OFF
OFF
Address 12
OFF
ON
ON
OFF
ON
Address 13
OFF
ON
ON
ON
OFF
Address 14
OFF
ON
ON
ON
ON
Address 15
ON
OFF
OFF
OFF
OFF
Address 16
ON
OFF
OFF
OFF
ON
Address 17
ON
OFF
OFF
ON
OFF
Address 18
ON
OFF
OFF
ON
ON
Address 19
ON
OFF
ON
OFF
OFF
Address 20
ON
OFF
ON
OFF
ON
Address 21
ON
OFF
ON
ON
OFF
Address 22
ON
OFF
ON
ON
ON
Address 23
ON
ON
OFF
OFF
OFF
Address 24
ON
ON
OFF
OFF
ON
Address 25
ON
ON
OFF
ON
OFF
Address 26
ON
ON
OFF
ON
ON
Address 27
ON
ON
ON
OFF
OFF
Address 28
ON
ON
ON
OFF
ON
Address 29
ON
ON
ON
ON
OFF
Address 30
ON
ON
ON
ON
ON
Address 31
OFF
OFF 115,200 BPS, See note 1 below.
OFF
ON
9,600 BPS
ON
OFF
19,200 BPS
ON
ON
38,400 BPS
OFF
Encrypted communication not required
See note 2 below.
ON
Encrypted communication required
See note 2 below.
Switches 1 to 5 select the device address. Switch 6 and 7 select the communication baud rate. Switch 8
enables encrypted communication. All other configuration settings are set via host software.
Note 1: Firmware revisions prior to 1.38.1, this setting is 2,400 BPS.
Note 2: Firmware revisions prior to 1.38.1, SW8 is not defined. Set to the OFF position.
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 4
8. Status LEDs:
Power-up: All LED’s OFF
Initialization: Once power is applied, initialization of the module begins
When initialization is completed, LEDs A through R2 are briefly sequenced ON then OFF
Run time: After the above sequence, the LEDs have the following meanings:
A LED: Heartbeat and On-Line Status:
Off-line: 1 sec rate, 20% ON
On-line:
Non-encrypted communication: 1 sec rate, 80% ON
Encrypted communication:
.1 sec ON, .1 sec OFF, .1 sec ON, .1 sec OFF, .1 sec ON, .1 sec OFF, .1 sec ON, .3 sec OFF
A LED Error Indication:
Waiting for application firmware to be downloaded: .1 sec ON, .1 sec OFF.
B LED: SIO Communication Port Status:
Indicates communication activity on the SIO communication port
1 LED: Input Status: IN1
2 LED: Input Status: IN2
3 LED: Input Status: IN3
4 LED: Input Status: IN4
5 LED: Input Status: IN5
6 LED: Input Status: IN6
7 LED: Input Status: IN7
8 LED: Input Status: IN8
TMP: Cabinet Tamper
PFL: Power Fault
Input in the inactive state: OFF (briefly flashes ON every 3 seconds)
Input in the active state: ON (briefly flashes OFF every 3 seconds)
Input in a trouble state: Rapid Flash
R1 LED: reader port 1:
Clock/Data Mode: Flashes when data is received, either input
Data 0/Data 1 Mode: Flashes when data is received, either input
RS-485 Mode: Flashes when transmitting data
R2 LED: reader port 2:
Clock/Data Mode: Flashes when data is received, either input
Data 0/Data 1 Mode: Flashes when data is received, either input
RS-485 Mode: Flashes when transmitting data
K1 through K6 LEDs: Illuminates when output relay RLY 1 (K1) through RLY 6 (K6) is energized.
Every three seconds, LEDs A through R2 are pulsed to their opposite state for 0.1 sec.
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 5
9. Specifications:
The Interface is for use in low voltage, class 2 circuits only.
Primary power: 12 to 24Vdc ±10%, 550mA maximum (plus reader current)
12Vdc @ 450mA (plus reader current) nominal
24Vdc @ 270mA (plus reader current) nominal
Outputs: 6 outputs, Form-C, 5A @ 28Vdc, resistive
Inputs: 8 unsupervised/supervised, standard EOL: 1k/1k ohm, 1% 1/4 watt
2 unsupervised, dedicated for cabinet tamper and UPS fault
monitoring
Reader interface:
Reader power: 12Vdc ±10% regulated, 125mA maximum each reader
(jumper selectable and input voltage (VIN) must be 20Vdc minimum)
or
12 to 24Vdc ±10% (input voltage passed through) 125mA
maximum each reader
Reader LED output: TTL compatible, high > 3V, low < 0.5V, 5mA source/sink
maximum
Reader buzzer output: Open collector, 5Vdc open circuit maximum, 10mA sink
maximum
Reader data inputs: TTL compatible inputs or 2-wire RS-485
Communication: RS-485, 2-wire 9600, 19200, 38400 or 115200bps
Cable requirements:
Power: 18AWG, 1 twisted pair
RS-485: 24AWG, 120 ohm impedance, twisted pair with shield, 4,000'
(1,200m) maximum
Alarm inputs: 1 twisted pair per input, 30 ohms maximum
Outputs: As required for the load
Reader data (TTL): 6 conductors, 18AWG, 500 feet (150m) maximum
Reader data (RS-485): 24AWG, 120 ohm impedance, twisted pair with shield, 4,000'
(1,200m) maximum
Mechanical:
Dimension: 6" (152mm)W x 8" (203mm)L x 1" (25mm)H
Weight: 11 oz. (312g) nominal
Environment:
Temperature: -55°C to +85°C, storage
0°C to +70°C, operating
Humidity: 0% to 95% RHNC
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 6
Warranty:
Mercury Security Corporation warrants the product is free from defects in material and workmanship under
normal use and service with proper maintenance for one year from the date of factory shipment. Mercury
Security Corporation assumes no responsibility for products damaged by improper handling or installation. This
warranty is limited to the repair or replacement of the defective unit.
There are no expressed warranties other than set forth herein. Mercury Security Corporation does not make, nor
intends, nor does it authorize any agent or representative to make any other warranties, or implied warranties,
and expressly excludes and disclaims all implied warranties of merchantability or fitness for a particular purpose.
Returned units are repaired or replaced from a stock of reconditioned units. Returns must be accompanied by a
return authorization number (RMA) obtained from customer service, and prepaid postage and insurance.
Liability:
The Interface should only be used to control exits from areas where an alternative method for exit is available.
This product is not intended for, nor is rated for operation in life-critical control applications. Mercury Security
Corporation is not liable under any circumstances for loss or damage caused by or partially caused by the
misapplication or malfunction of the product. Mercury Security Corporation's liability does not extend beyond the
purchase price of the product.
Mercury Security Corporation © 2011 MR52 DOC 10107-0015 REV 2.02 Page 7
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