Logic Output. Shure MX392, S3

L OGIC O UTPUT

Go to the Logic Output page of Conference Composer. If the LED IN wire is connected to Logic

Output pin 1, then you need to assign Pin 1 by left-clicking the desired pin in the DB-25 graphic.

The pin will turn color from gray to pink. Next, right-click on the pin and reverse the polarity. A horizontal bar should appear under the pin number in the DB-25 graphic and under the pin number under the Pin column:

Reversing the polarity is critical to proper operation. When S3 is in the ON position, the MX392 wants to see an Active Low signal (0V DC) from the Vortex Device in order to illuminate the LED.

By default, the EF Device has been designed to assume that an Active High signal (+5V DC) is required to drive an LED. The MX392 uses the active low signal to use part of the phantom power voltage to illuminate the LED. If you do not reverse the polarity, the LED will light up exactly the opposite way you will have intended.

Next, right click in the A CTIVATED C OMMAND column for Logic Input 1 and select I NSERT , I NPUT , 1,

M UTE , O FF . Now, whenever the microphone is unmuted (Mute = False), the LED will illuminate on the MX392.

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Next, right click in the D EACTIVATED C OMMAND column for Logic Input 1 and select I NSERT , I NPUT , 1,

M UTE , O N . Now, whenever the microphone is muted (Mute = True), the LED will not illuminate on the MX392.

Here is what the screen should look like when you are finished:

Make sure the LED works as designed. If you press the membrane switch, you should see the LED above the pin illuminate in Conference Composer as well as on the MX392. Since the switch is a toggle switch, the LED will stay lit until the switch is pushed again:

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