42 DAA2 & DAX — P/N 53265:A1 8/24/2011
DAA2 Digital Audio Amplifiers DAA2 Operation
PRIMARY AMP Switch - SW4
Set this switch to ON for normal amplifier operation.
Set the switch to OFF to safely disable the primary
amplifier, forcing a switch to backup amplifiers.
The switch should be set to OFF only when testing the
system’s operation. Otherwise it should always be
ON.
2.3.2 Programming
The DAA2 is programmed through VeriFire Tools. Refer to the DVC Digital Voice Command
manual as well as the VeriFire Tools CD and Help file for information on how to create, prioritize
and download audio messages, create system equations for message distribution, and set system
parameters.
2.4 DAA2 Operation
2.4.1 Sig Sil Control
This pushbutton control silences speaker outputs
on circuits 1 through 4. This switch is enabled by
the DAA2 when there is a communication loss
with the DVC.
2.4.2 Volume Control - Master and Auxiliary
The volume of audio messages is determined through FACP/network annunciator programming
and VeriFire Tools Read Status Service Form.
2.4.3 FFT Communication
Refer to the FFT appendix in the DVC Digital Voice Command manual for information on
firefighter telephone communication.
2.4.4 Trouble Messages
DAA2s will send trouble messages to the DVC through the wire or fiber DAL (Digital Audio
Loop). The DVC in turn sends them to the panel or network annunciator. Refer to the System
Troubles appendix in the DVC Digital Voice Command manual for a list and description of trouble
messages.
2.4.5 Read/Alter Status
An NCA-2, NFS2-3030 and network workstation, as well as a computer running VeriFire Tools and
connected to the NUP port of the DVC, will be able to read the status of a DAA2 and its speaker
circuits. Refer to the appropriate panel manual or the VeriFire Tools Read Status Service Form.
A DAA2 speaker circuit may be disabled through NCA-2 and NFS2-3030 Alter Status panel
programming and ACS programming.
Figure 2.33 PRIMARY AMP Switch
SW4
Switch 4 set
to ON.
DAA2 switch 1 and 4.wmf
OFF ON
Figure 2.34 Sig Sil Switch
SW5
SIG SIL
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