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LNL-1320 Dual Reader Interface Module
The RS-485 communication is asynchronous, half-duplex, using 1 start bit, 8 data bits, 1 stop bit.
81.1.3
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.
NC
C
NO
NO
NC
C
NC
C
NO
NO
NC
C
412 —
revision 7
Control Output Wiring
12 VDC
+
-
D IOD E CU R REN T R ATIN G > 1 X STR IKE C UR R ENT
D IOD E BR EAK D OW N VOLTAGE > 4X STR IKE VOLTAGE
FOR 12 OR 24 VD C STRIKE, D IODE 1N4002 (100 V/1A)
TYPIC AL
AC
XFMR
CLAMP VOLTAGE > 1 .5 X VAC R MS
FOR 24 VAC STR IKE, PAN ASON IC ER Z-C O7D K470
TYPIC AL
DC STRIKE
-
+
AC STRIKE
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