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.
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