Polycom MX392 - Manual (Page 25)

Make sure the LED works as designed. If you press the membrane switch, you should see the LED
above the pins illuminate in Conference Composer as well as on every MX392. Since the switch is
a toggle switch, the LED will stay lit until the switch is pushed again:
When the membrane switch is pushed again, the EF Device toggles the state from unmuted to
muted. Now, the LED should not be illuminated since the input from the MX392 is now muted.
Both LED's (Conference Composer and MX392) should not be illuminated:
M
OMENTARY
O
PERATION
(P
USH TO
T
ALK
)
Let's say that you want MX392 to be muted by default. If someone pushes the membrane switch,
you want the microphone to stay unmuted while the user continues to hold the switch down. You
also want the LED to illuminate when the microphone is unmuted.
First, set DIP Switch S2, and S3 to ON and set S1 and S4 to OFF. Then, connect SWTICH OUT to
one of the Logic Input pins 1-24. Connect LOGIC GND to Logic Output pins 21-25. Connect LED IN
to one of the Logic Output pins 1-20.
D
EFAULT
C
ONDITIONS
First, you want to make sure that the Vortex Device has all microphones muted as part of the Power
on Preset. Next, you need to make sure that if the unit is controlled by a control system that the
proper commands are sent to the Vortex Device to mute the microphones when the room is used
for conferencing or sound reinforcement purposes. Remember that since the requirement is push
to talk, the user of the microphone is the one that must initiate the activity of unmuting the
microphone.
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