Special
Order
Products
LDF
LDF Loudspeaker Master Station with External Control Capability
LDF-20C
LDF-40C
LDF-20CA
LDF-40CA
- 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
LS-NVP
Red
LDF-20CA
LS-NVP
Red
1
2
3
LE-DA
1
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.
~
Blk
Grn
Blk
Grn
E
-
20
E
-
External
Terminal Block
CONSTANT CLOSURE:
Normally Open contacts remain closed as
long as master has sub station selected.
RY-PA
#1
1
2
Constant Closure for Station #1
YEL
BLK
RY-PA
#2
Constant Closure for Station #2
YEL
BLK
3
~
20
RY-PA
#3
YEL
Constant Closure for Station #3
BLK
L
PS-1225UL
Terminal Block
DUAL FUNCTIONS FROM EACH CHANNEL:
+
-
+
-
RY-PA
1
BLK
Momentary closure #1
YEL
YEL
#1
Equipment for each station that requires
both a constant closure and momentary
closure when a channel is selected:
2 RY-PA relays
RY-PA
#2
Constant closure #1
BLK
L
2 Diodes (1N4001)
RY-PA
#1
2
Momentary
closure #2
YEL
YEL
BLK
LDF Master
RY-PA
#2
Constant
closure #2
Individual Components for System:
BLK
+
-
LDF-nC
Master station with selective contact output capability (20, 40)
Master station w/handset and selective contact output capability (20, 40)
20-call Add-on Selector with selective output capability
40-call Add-on Selector with selective output capability
Relay for selective output (1 per station requiring external contact)
12V DC, 2.5A Power Supply
LDF-nCA
LD-20AS
LD-40AS
RY-PA
PS-1225UL
LE-series
LS-NVP
Any model sub station with LE-prefix
Vandal proof sub station (add SBX-NVP for surface mount)
LDF TERMINAL DEFINITIONS:
+
-
Positive 12V DC input, and constant closure output
Negative
IMPORTANT:
1~40
Station number
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.
E
R
L
Common communication
Occupied LED control
Positive output for selective closure
(Located on terminal block)
Pg. 1
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