
3
290A3828-03
"SPK" SPEAKER
(WHT/BRN)
"SPK" SPEAKER
(WHT/BRN)
"COM"
COMMON
(WHT)
"COM"
COMMON
(WHT)
"PWR
+
"
(BLK)
*
SEE POWER
CONNECTIONS
*
"EGND" (GRN/YEL)
"PWR
-
" (WHT)
"PWR
+
"
(BLK)
*
"EGND" (GRN/YEL)
"PWR
-
" (WHT)
3
3
4
2
1
GRN
BLK
WHT
GRN
BLK
WHT
"AUD" AUDIO
"COM" COMMON
"CTRL" CONTROL
LOCAL SPEAKER/MICROPHONE
MODEL AD-SF-25
LOCAL SPEAKER/MICROPHONE
MODEL AD-SF-25
MASTER
PANEL MOUNTED
INTERCOM
SLAVE
PANEL MOUNTED
INTERCOM
1K
1WATT
NOTES:
1. Mounting Holes
2. Cover Plate
3. Off/On/Speaker Volume Control
4. Press-to-Talk Switch
POWER CONNECTIONS
:
"PWR+" (Black) +DC-Power 12/24V Models
HOT 120/240V Models
"PWR-" (White) Common 12/24V Models
Neutral 120/240V Models
"EGND" Earth Ground 120/240V Models only
(Green/yellow)
POWER
MASTER
SLAVE
12-18VDC AD-26CP AD-26DP
120V 50/60Hz AD-27CP AD-27DP
22-30VDC AD-56CP AD-56DP
240V 50/60Hz AD-57CP AD-57DP
Operating Principle:
• Master normally listens to Slave.
• Slave talks to Master hands-free, without
having to press a talk switch.
• To talk into Master, press talk switch and speak
into speaker/microphone. Release talk switch
to listen.
-8-
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