Polycom MX392 - Manual (Page 27)

Now, right click in the H ELD C OMMAND column for Logic Input 1 and select I NSERT , I NPUT , 1, M UTE ,
O FF . Now, whenever the switch goes Active Low (0V DC), the Vortex Device will unmute Input 1.
If you are successful, you should see this on the screen:
Make sure that the physical wiring works by pressing and holding the membrane switch. You
should see the LED above the pin assignment lit in green:
Repeat the above process for each MX392 microphone that you want to connect to the Vortex
Device.
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