PS Engineering
PMA450B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0600
Page 2-9
Rev. 5, August 2020
2.6.2
Storing Messages:
2.6.2.1
Audio Alert Messages
The PMA450B has four discrete messages that can be played when triggered by an external event.
The recording time is limited to 5 seconds per message.
Messages can be changed from the user setup menu.
Message Location
Factory Stored Message
Connector
Input
Logic
Message #1
Chime
J2-17
Active High (5-28
VDC)
Message #2
“Check oil pressure”
J2-19
Active Low
Message #3
“Master caution”
J2-30
Active Low
Message #4
“Check fuel”
J1-24
Active Low
Message Acknowledge
J1-28
Active Low
These four messages will play back when the trigger associated with the message number is activated.
Message 1 will play as long as the trigger is active, but cease when the stimulus is removed, and is suitable
to supplement a Sonalert Piezoelectric buzzer. This cannot be stopped by the front panel or external
Acknowledge button.
NOTE: Message 1 is the only message that is suitable to be used in parallel with a Sonalert.
Message 2 – 4 will play when triggered, and stop when the ACK button is pushed, or external Acknowledge
button pushed (J1-28, Active Low).
(Serial T45B2103 and up) Alert Messages 2 through 4 can be configured through the dealer setup function
to play once and stop, or continuously until the condition is removed or ACK pushed. Contact PS Engineering
for more information.
If J1-28 is grounded, then messages 2 – 4 will play once and stop.
Messages are played only in the crew headset. They are not heard over the cockpit speaker.
Note
1
: The external triggers are configured from the factory as shown. They can be reconfigured in the field
to accept Active High or Active Low, or be off completely. Contact PS Engineering for more information.
