CAMBRIDGE QT Przewodnik Instalacji Pobierz pdf (Strona 12)

page 12

Installing Paging or Music to the Audio Inputs

1. Be sure power is OFF by unplugging power cord from wall

outlet.

2. Balanced Audio Input: (most often, but not always characteristic

of paging systems.) Connect signal wires to + and - at input A or

B. Connect the shield to GND at the audio source.

3. Unbalanced Audio Input: (typical of music systems.)

a. Mono Signals: Connect signal wire to both L and R at

input A or B. Connect the ground wire to GND.

b. Stereo Signals: Connect signal wires to L and R at

input A or B. Connect the ground wire to GND.

4. If a music source is to be connected, using Input B allows

emergency music shut-off. See Contact Closures below.

Installing Contact Closures

The QtPro provides an instant shut-off capability for masking and/ or

audio Input B if connected to a contact closure interface. The contact

closure utilizes the same style connector as audio Inputs A and B (4-

pin).

To leverage this feature for masking, connect a two-conductor cable

to the two connectors, labeled M3V and MGND. To leverage this

feature for Audio Input B, connect a two-conductor cable to the two

connectors, labeled B3V and BGND.

The other end of these conductors (treated as pairs/circuits) can be

terminated on closure mechanisms of choice.

1. To shut off masking, form a connection between the two “M”

conductors.

2. To resume masking, break the connection (Don’t break the

connectors as you may want to reuse them).

The contact closure for audio Input B follows the same logic.

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CAMBRIDGE QT Przewodnik Instalacji Strona 12