GAI-Tronics 12389-001 NOVA PA/GA Systems S.M.A.R.T. Modules - Manual (Page 23)

Pub. 42004-674L2H
NOVA P UBLIC A DDRESS S YSTEMS - S.M.A.R.T. M ODULES P AGE 21 of 24
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Speaker Master Module
Description
In normal operation, the GTC 69403-101 Speaker Master Module communicates with the CPU via an
RS-485 connection. It transmits output speaker power level tap and page group control commands via an
RF modem to the Speaker Remote Modules in order to control broadcast volume levels and locations. It
receives acknowledgment messages and speaker integrity messages from the remote modules.
The module has four channels, and transmits and receives RF communication at 245 kHz. Each channel
is connected to the speaker line output of an associated paging zone power amplifier. The module also
controls an associated Test Tone Generator Module via a dedicated RS-485 connection. This tone
generator provides 35 Hz power (through the zone power amp) to the Speaker Remote Modules.
Figure 3. Speaker Master Module