– 6 –
5 
Wiring Diagrams - Important Wiring Rules
Door or sub station to master station intercom wiring, single or multi-master station
Intercom Operation: 
· To initiate call at sub station, push the station's Call button.
· To answer sub station call at LEF-3L, push the appropriate Station Selector button.
· To talk to sub station, press and hold TALK and release to listen. 
Notes:
 
1
 
from a sub station can wire to any number
 
1
,
 
2
, or
 
3
 
but never
 
C
.
C
 is only used for internal communication between master stations. See below.
Master to Master intercom wiring, internal communication between master stations
Important: Never wire
 
C
 
to another master station's
 
C
 terminal.
Master to sub intercom only, no internal communication between master stations 
Intercom Operation: 
· To initiate call at sub station, push the station's Call button.  
· To answer sub station call at LEF-3L, push the appropriate Station Selector button.    
· To talk to sub station, press and hold TALK and release to listen.    
PS12
 PS-1225/S/UL, PS-1215DIN
Choose either method.
Operation notes:
When operating M1, push #2 Station 
Selector button to listen to "M2", press 
and hold "TALK" to talk.
When operating M2, push #1 Station 
Selector button to listen to "M1", press 
and hold "TALK" to talk.
When operating either master station 
utilizing the "same channel method," 
push #3 Station Selector button to listen 
to the other master station, press and 
hold "TALK" to talk.
LE-SS/A series stations use colored leads
1
 is red lead
E
 is black lead
-
 is blue lead
Notes:
1
 from a sub station can go to
1
, 
2
 or 
3
 but never 
C
.
Only master stations can answer 
calls and communicate with sub 
stations.
* LE-SS/A is manufactured by 
Aiphone Corporation in the U.S.
1
E
-
3
2
1
E
-
C
R
Y
+
-
+
LE series sub /
door station
Single
LEF-3L
*Keep  E  /  
-
  jumpers
only for 2-wire setup
PS12
*
*
1
E
-
3
2
1
E
-
C
R
Y
+
3
2
1
E
-
C
R
Y
+
-
+
LE series sub /
door station
*Remove  E  /  
-
  jumpers in
all multimaster systems
Multi-master
LEF-3L LEF-3L
PS12
*
3
2
C
1
E
+
Y
-
R
3
C
1
2
E
+
Y
-
R
+
-
LEF-3L
LEF-3L
PS12
-
+
C 
2 
1 
3 
E 
3 
2 
1 
C 
E 
+ 
Y 
- 
R 
+ 
Y 
- 
R 
LEF-3L 
using channel 3 
PS12
- 
+ 
3 
2 
1 
E 
- 
R 
Y 
+ 
C 
3 
2 
1 
E 
- 
R 
Y 
+ 
C 
1 
E 
- 
1 
E 
- 
Red 
Black 
Blue 
LEF-3L  LEF-3L 
*Remove all  E  /  
-
  jumpers 
LEF-3 L  “Parallel Method ” 
LE series sub / door station 
LE-A/LE-DA etc 
LE series sub / door station 
LE-A/LE-DA etc 
LE-SS/ A  series 
door station*
PS12 
Red
Black
Blue