Biamp A4 - Manual (Page 23)

Introduction
When failover occurs, any received ATP command strings intended for the Primary Channel are
automatically routed to the Secondary Channel, and any acknowledgement messages that the
Secondary Channel returns will contain the index value of the Primary Channel, even though the
Primary Channel is no longer the active channel. This preserves third-party control support
during channel failover.
Note: Channel failover is not available when Device failover is being used, and vice versa.
AudiaFUSION Block
The AudiaFUSION block provides connection points for audio coming into the block, and logic
output connection points for fault indications.
If channel failover is in use, the Primary Channel will be indicated with (P) and the Secondary
Channel with (S). The connection point for the Secondary Channel will appear in a light gray
color and will not accept a wire connection. Instead, the audio signal connected to the Primary
Channel will automatically be used as the input for the Secondary Channel when channel failover
occurs.
If device failover is in use, the block will appear as two AudiaFUSION blocks “fused” together.
The Primary (left) side will have the audio and logic connection points and the Secondary (right)
side will have no connection points.
The complement of logic output connection points that are available is dependent on whether the
Group Logic Outputs
property in the AudiaFUSION block initialization dialog window is checked
or not. When that setting is unchecked, the block will feature six logic outputs per channel, plus a
global Fan Stuck Rotor output. The six logic outputs for each channel correspond to the six fault
types that an AudiaFUSION amplifier channel can report: Heat Sink, Short Circuit, Channel
Failure, Excessive Clipping, Low Impedance, and High Impedance.
If Group Logic Outputs is checked, only two logic outputs are provided per amplifier channel,
Alarm and Warning, plus the global Fan Stuck Rotor. In this mode, the Alarm output is a logical
OR of the Heat Sink, Short Circuit, and Channel Failure Alarms. The Warning output is a logical
OR of the Heat Sink, Excessive Clipping, Low Impedance, and High Impedance Warnings. When
the AudiaFUSION block is initialized with Device Failover active, two additional global logic
outputs are provided, Primary Device Good and Secondary Device Good.
AudiaFUSION Control Dialog Window
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