
18
-24-
Operating Principle:
• Master can select to monitor any one or more remotes via
master switch box.
• To talk to remote(s), master closes desired selector switch,
presses talk switch, and speaks into the speaker/microphone.
Master releases talk switch to listen.
• Selected remote(s) talk to master “hands-free” without having
to press remote talk switch.
• Remotes cannot talk to other remotes.
• Remotes not selected by master cannot talk hands-free and
must press talk switch to initiate call to master.
• When initiating a call to master, remote must specify its
location for master to respond.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Talk/Listen Switch
4. Master Selector Switch (customer supplied)
5. Double-Pole (OFF-ON) Toggle Selector Switch
Power
Master
Remotes
120V 50/60Hz AD-27C-1 AD-27D-M49
POWER CONNECTIONS:
BLK HOT 120/240V Models
WHT Neutral 120/240V Models
GRN Earth Ground 120/240V Models
290A4074
REMOTE "B"
MASTER
SEE POWER
CONNECTIONS
MASTER SELECTOR SWITCH BOX
TO REMOTE RB
*
REMOTE "A"
1
4
2
BLK
WHT
GRN
TO OTHER REMOTES
1
3
2
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
BLK
RED
GRN
WHT
BLK
RED
GRN
WHT
BLK
RED
GRN
WHT
BLK
RED
RC
RB
RA
GRN
WHT
5
3
1
2
3
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