Chapter 4: Supplementary applications
P/N 3101890-EN • REV 006 • ISS 21JUN18 65
Figure 16: Special page mode signal flow
Automatic messaging
One of the features of the VM-PMI is the method used to monitor the integrity of the digital audio system. When
an audio messaging system is configured, default audio messages are recorded for the EVAC and Alert channels.
The text of default messages should be generic in nature, and should not include location specific instructions.
When the system is in the normal condition, the VM-PMI continuously transmits default messages over the
network audio riser. The zone amplifiers use the default messages to verify their operational integrity, as well as
the integrity of the riser wiring.
When an alarm is detected, the evacuation and alert message channels are selected by the amplifiers in the
appropriate areas in the facility, as directed by the system correlations. If a specific evacuation message has been
programmed to play in response to the alarm, it is sent out over the evacuation channel. Location specific
evacuation messages contain information and instructions that should only be used for a specific alarm location.
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