QSC Audio SRA 2422 - Manual (Page 28)

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CONNECTIONS-
Remote on/off (remote trigger)
Remote turn-on and turn-off capability is provided by the remote
trigger jacks on the rear panel. Remote trigger can be operated by
two methods, 12 Volt DC or contact closure (switch, relay). The IN
and OUT jacks can be used interchangeably as they are wired in
parallel.
The amplifier’s front panel power switch must remain in the
ON position when using the remote trigger feature. The
amplifier’s power status is controlled from the remote trigger
connections. If no plug is inserted in the remote trigger jacks,
amplifier on/off is controlled by the front panel power switch.
If a mono plug is inserted into either jack, the amplifier will go into
standby mode (off). Apply +12 Volts DC to the tip and ground (- or
negative) to the sleeve, and the amplifier will be enabled (on). Be
sure to use a mono plug for +12 Volts DC remote trigger operation.
If a stereo plug is inserted into either jack and no connections are
made between the tip, ring, and sleeve, the amplifier will be
enabled (on). If a contact connection (switch or relay contacts) is
made between the sleeve and the ring, the amplifier will go into
standby mode (off). The tip connection is not utilized when contact
closure method is used.
Remote Trigger
Remote Trigger Method Type of Plug Power On (enable) Power Off (standby)
12 Volts DC
Contact Closure
Sleeve/Tip
(mono)
Ring/Tip/Sleeve
(stereo)
Contacts Open Contacts Closed
12 Volts DC 0 Volts DC