Alarm contract wiring, Control output wiring, Jumper and dip switch usage – Keri Systems MR52 User Manual
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Mercury Security Corporation © 2011
MR52
DOC 10107-0015
REV 2.02
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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.
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
7. Jumper and DIP Switch Usage:
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
NOTE: The input power (VIN) must be 20Vdc minimum if the 12Vdc selection is to be used.
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