-14-
10
Reminders:
• Before installing remote intercoms, precautions should be taken to prevent feedback between two or more remotes in close
proximity and acoustically reflective areas.
• Audio and power cables are not supplied with AD‑28X‑MV.
• In this installation the Master is constantly broadcasting audio from the Slave. Pushing the listen/talk switch on either unit
forces the Slave into the listen mode and the Master into the talk mode. The MAS/SLA jumper J2, located on the P.C. board
inside the Slave, must be placed in the SLA mode for this operation. See SLAVE MODE on page 2 and figures 2 and 6.
• Using normally open, simple contact closure foot switches (customer supplied) allows for total hands‑free operation of the
listen/talk functions.
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.
NOTES:
1. Speaker/Microphone
2. Off/On/Speaker volume control
3. Press‑to‑talk Switch
4. “Call” Tone Switch
Power
Master
Slave
120V 50/60Hz
AD‑28X‑MV
AD‑28X‑MV
22‑30VDC
AD‑28X‑MV AD‑28X‑MV
240V 50/60Hz
AD‑28X‑MV
AD‑28X‑MV
290A4725-10
MASTER
1
3
2
4
SLAVE
1
3
2
4
1K
1 WATT
AC
10
9
8
7
6
5
4
3
2
1
DRY CONTACT
DRY CONTACT
AUDIO (-)
AUDIO (+)
REMOTE
GROUND (-)
24VDC (+)
NEUTRAL
HOT
EARTH GROUND
AC
DRY CONTACT
DRY CONTACT
AUDIO (-)
AUDIO (+)
REMOTE
GROUND (-)
24VDC (+)
NEUTRAL
HOT
EARTH GROUND
AC
AC
10
9
8
7
6
5
4
3
2
1
FOOT SWITCH
N.O.
FOOT SWITCH
N.O.
ATKINSON DYNAMICS
UNIVERSITY PARK, IL USA
A FEDERAL SIGNAL COMPANY
ATKINSON DYNAMICS
UNIVERSITY PARK, IL USA
A FEDERAL SIGNAL COMPANY
Summary of Contents for AD-28X-MV
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