
GRN
WHT
BLK
GRN
WHT
BLK
GRN
WHT
BLK
AUDIO
CONTROL
COMMON
290A4066
MASTER "A" MASTER "B" SLAVE
3
4
2
1
3
2
2
1K
1
WATT
SEE POWER
CONNECTIONS
BLK
WHT
GRN
*
*
BLK
WHT
GRN
*
BLK
WHT
GRN
*
RED
BLU
1
POWER CONNECTIONS:
BLK +DC Power 12/24V Models
HOT 120/240V Models
WHT Common 12/24V Models
Neutral 120/240V Models
GRN Earth Ground 120/240V Models only
Operating Principle:
• Masters normally listen to slave.
• Slave talks to master hands-free, without having to
press a talk switch.
• When any master talks, slave hears. Other masters
will hear.
• To talk into master, press talk switch and speak into
speaker/microphone. Release talk switch to listen.
• Master “A” can talk by pressing either the talk switch
or external switch (customer supplied).
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker Volume Control
3. Press-To-Talk Switch
4. Customer-Supplied External Normally-Open Press-
To-Talk Switch, Momentary (e.g., foot switch)
Power
Master A
Master B
Slave
12-18VDC AD-26C-2 AD-26C AD-26D
120V 50/60Hz AD-27C-2 AD-27C AD-27D
22-30VDC AD-56C-2 AD-56C AD-56D
240V 50/60Hz AD-57C-2 AD-57C AD-57D
10
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