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The second change required is to rotate the position of the Talk/Listen switch. This can be accomplished 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 4). The rubber boot is then tightened up against the cover plate with the toggle switch lean‑
ing to the talk position, as shown in figure 3.
The third change involves the interconnect wiring. When a unit is placed in the Slave mode it defaults to the Talk or transmit po‑
sition. 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) on both terminal blocks (see figure 5) must be connected between the Master and the Slave unit. Paragraph
G. WIRING DIAGRAMS contains 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 activa‑
tion of a local intercom. The wiring diagram section illustrates Master/Slave Installation and Using Foot Switches Diagrams.
(See figures 8 and 9).
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 carried on the line. Do not depress the call switch while
carrying on a conversation 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 DRY CONTACTS TO EXTERNAL DEVICE:
Depressing the call button also closes a normally open dry contact rated at .4 amps @ 125VAC or 1.0 amp @ 24VDC. 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 10).
MICROPHONE OPTION:
Keying the microphone (PTT) places the intercom in talk mode with the microphone over riding the speaker. A hand held noise
cancelling microphone is recommended when operating in loud ambient environments.
An optional hand‑held microphone conversion kit (Part No. K8502016) is available for Model 310‑MV. This field installable kit
includes a new cover plate with a 1/4" microphone jack and a microphone.
Units with optional microphones are not UL Listed for use in hazardous locations, Marine, or Type 4X enclosure ratings.
24VDC:
When connecting the intercom to 24 volts DC, either the positive (+) supply conductor must be fused at the source with a 1/2 A
fuse or a power‑limited power source must be used.
The 310 is capable of sending DC power to another unit which is mounted in a remote location without local power. 24VDC is
available from pins 4 and 5 of the terminal block. It can be run along with the signal lines to an intercom in a remote location.
Only one unit should share the power supply of another unit in any installation.
Connect positive (+) supply conductor to pin #4 of terminal block. Connect negative (‑) supply connector to pin #5 of terminal
block.
Figure 11 in the wiring diagrams section shows how two intercoms can be hooked up if no remote power is available.
ISOLATED BALANCED/UNBALANCED LINES:
The audio signals for the 310 are transmitted over a wire pair using balanced line technology. This means each wire carries a sig‑
nal that is opposite in polarity of the other. At the input of the intercom is an isolated balanced line transformer. This transformer
subtracts the two signals from each other providing an output free of noise generated onto the wires by some other noise source
such as a motor or light fixture near the wires.
Units with the optional microphone should be used only in indoor applications.
CAUTION
CAUTION
NOTE
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