User guide

Comet Computer DAC User Guide
The EXOGAL Comet has mute relay connected between the positive and negative outputs. When this
relay is engaged, it connects the positive output to the negative output, reducing the output to zero.
This relay, which produces an audible click when it engages or disengages, is not in the music signal
path. The mute relay is engaged:
• When the EXOGAL Comet detects an AC input level below its minimum operating range
• Each time the EXOGAL Comet is powered-up
• When the volume control is set to zero AND the Mute key on the remote control is pressed
When the EXOGAL Comet is in either Mute Mode,
the Volume Screen will indicate this by displaying the indicators:
Other Back Panel Connectors
Serial The 3.5mm serial connector can be used to control the Comet with an automation
system. It is also used to update the Comet’s internal firmware. It uses 5V TTL logic
and is compliant with a FTDI TTL-232R-5V-AJ USB to serial converter cable.
Trigger Output The 3.5mm trigger output can be used to turn ON/OFF external equipment, such
as a amplifier. By default it is configured as a 12VDC output. Optionally it can be
configured as a 5VDC, or pulsed output.
The TIP is positive and the SLEEVE in common (GND). The trigger output is ON when the Comet is in
a operational state. It is OFF when the Comet is in standby.
GND RX TX