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- LDF SUPPLEMENT TO LAF-C/CA INSTRUCTIONS -
The LDF Loudspeaker Intercom and External Control System is designed for communication between a central master
station and remote intercom stations. The LDF is an expanded feature version of the LAF-C/CA system. All
information regarding installation other than the external control functions is included in the LAF-C/CA instructions. In
addition to communication to remote locations, external devices can be activated, such as activating a CCTV camera
when the associated sub station is selected, selectively controlling the corresponding door strike or maglock, or both.
WIRING DIAGRAM: SYSTEM USED FOR CCTV CAMERA CALL-UP
LDF
LDF Loudspeaker Master Station with External Control Capability
LDF-20C LDF-40C
LDF-20CA LDF-40CA
Individual Components for System:
LDF-nC Master station with selective contact output capability (20, 40)
LDF-nCA Master station w/handset and selective contact output capability (20, 40)
LD-20AS 20-call Add-on Selector with selective output capability
LD-40AS 40-call Add-on Selector with selective output capability
RY-PA Relay for selective output (1 per station requiring external contact)
PS-1225UL 12V DC, 2.5A Power Supply
LE-series Any model sub station with LE-prefix
LS-NVP Vandal proof sub station (add SBX-NVP for surface mount)
IMPORTANT:
1. RY-PA must be used for each additional contact to
isolate AC voltage from the intercom circuit.
2. Extra contact connections and L are on separate
terminal block. LDF-40C/CA has two terminal blocks.
Special
Order
Products
1
2
3
~
20
E
-
+
-
LDF-20CA
+
-
PS-1225UL
LS-NVP
Red
Blk
Grn
Red
Blk
Grn
LS-NVP
1
2
3
~
20 L
1
E
-
LE-DA
RY-PA
#1
RY-PA
#2
RY-PA
#3
BLK
BLK
BLK
YEL
YEL
YEL
External
Terminal Block
CONSTANT CLOSURE:
Normally Open contacts remain closed as
long as master has sub station selected.
Constant Closure for Station #1
Pg. 1
Constant Closure for Station #2
Constant Closure for Station #3
LDF TERMINAL DEFINITIONS:
+ Positive 12V DC input, and constant closure output
- Negative
1~40 Station number
E Common communication
R Occupied LED control
L Positive output for selective closure
(Located on terminal block)
NOTE:
Leave jumper between E & - on master
and subs when using 2 conductor
homerun wiring IN SINGLE MASTER
SYSTEM ONLY. Jumper BLK/GRN
wires at LS-NVP in 2-wire system.
1
L
2
RY-PA
#1
BLK
+
-
RY-PA
#2
LDF Master
RY-PA
#1
RY-PA
#2
BLK
BLK
BLK
YEL
Momentary closure #1
YEL
Constant closure #1
YEL
Momentary
closure #2
YEL
Constant
closure #2
Equipment for each station that requires
both a constant closure and momentary
closure when a channel is selected:
2 RY-PA relays
2 Diodes (1N4001)
DUAL FUNCTIONS FROM EACH CHANNEL:
Terminal Block