To configure an intercom in the Slave mode, perform the following steps:
Disconnect power to the intercom before any installation, maintenance, or
configuration changes are performed.
1. Move the J2 jumper on the P.C. board from the MAS to SLA position (see Figure 6). This can
be done using long nose pliers, pulling the jumper off the “MAS” and center position and placing
it on the “SLA” and center position.
2. An intercom configured in the Slave mode needs to have the Listen/Talk switch default to the
talk position on the cover plate (see Figure 2).
The second change required is to rotate the position of the Talk/Listen switch. This can be ac‑
complished by loosening the rubber boot covering the toggle switch enough to allow the toggle
switch to turn 180 degrees. The dimple on the locking ring must seat itself in the locating hole
(see Figure 3). The rubber boot is then tightened up against the cover plate with the toggle switch
leaning to the talk position, as shown in Figure 2.
3. The third change involves the interconnect wiring. When a unit is placed in the Slave mode it
defaults to the Talk or transmit position. When hooked to a Master unit it is necessary to override
the Slave unit in order for the Master unit to be able to transmit. The #6 pin (remote control) on
both terminal blocks (see Figure 4) must be connected between the Master and the Slave unit.
Figures 7 to 13 contain wiring diagrams of typical intercom configurations.
REMOTE CONTROL:
Remote control is used to change the operation mode of a remote intercom from listen to talk
or from talk to listen upon activation of a local intercom. The wiring diagram section illustrates
Master/Slave Installation and Using Foot Switches Diagrams. (See figures 9, 10, and 12).
Normally open foot switches can also be connected to the Remote Control line in order to allow
“hands free” operation of the listen/talk functions.
CALL BUTTON:
Depressing the call button sends a 1 kHz tone onto the signal lines. All units listening to the line
will then broadcast this signal as a call.
The call signal is substantially louder than normal voice messages being car‑
ried on the line. Do not depress the call switch while carrying on a conversa‑
tion with someone on the system. This will subject the listener to very loud
sound levels.
The volume of the call signal is affected by the volume control on the receiving unit, so if the
volume is turned all the way down at a receiving station, the call signal will not be heard. To avoid
this problem, the call dry contacts can be utilized to drive an external signalling device.
CALL BUTTON ACTUATED DRY CONTACTS FOR OPERATING AN EXTERNAL
DEVICE:
Depressing the call button also closes a normally open dry contact rated at 0.5 A at 125 Vac or
1.25 A at 24 Vdc. This contact can be used to trigger a remote sounder or light in order to accent
the call feature. The wiring diagram illustrates how an external light or horn can be wired in to
augment the call tone. (See Figure 11.)
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Summary of Contents for AD-28X-MV
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