Polycom manual SHURE MX392 BASICS

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SHURE® MX392 BASICS

The Shure MX392 is a surface-mount, electret microphone that includes a programmable membrane on/off switch that can be controlled externally via logic input / output terminals. This application note explores how to connect the MX392 to a Vortex device (EF2280, EF2241, EF2201, EF2210, or EF2211) as well as how to program the Vortex device and MX392 to achieve the desired control over the membrane switch.

The MX392 includes three extra conductors as part of the microphone cable:

•LOGIC GND (Green): Connects to the logic ground of the Vortex Device. This can be either Pin 25 of the Logic Input port or Pins 21-25 of the Logic Output port.

•SWITCH OUT (White): Provides a TTL logic low when the membrane switch is pressed. This signal is available at all times for all switch settings. The SWITCH OUT function provides a momentary closure when S1 is OFF and a latching closure when S1 is ON. This conductor will go to one of the Logic Input Pins of the Vortex Device (Pins 1-24).

•LED IN (Orange): This terminal draws 5 V DC. This function can be modified so that the Vortex Device controls the action of the LED by flipping S3 to the ON position. If this terminal is shorted to LOGIC GND, the LED turns on.

The MX392 includes a set of 4 DIP switches that are located on the printed circuit board of the microphone. These DIP switches change the functionality of the membrane switch. For reference, here is a list of all possible functions of the switch:

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Contents Application Note Polycom Installed Voice Business Group Using the Shure MX392 Push to Talk Microphone with Vortex DevicesTable of Contents SHURE MX392 BASICS Switch Behavior Page LOGIC PORT PHYSICAL CONNECTIONS AND GROUNDING DEFAULT CONDITIONS TOGGLE OPERATION PUSH TO TALKLOGIC INPUT If you are successful, you should see this on the screen Do not assign any command to the HELD COMMAND columnLOGIC OUTPUT Here is what the screen should look like when you are finished Page TOGGLE OPERATION PUSH TO MUTE If you are successful, you should see this on the screen Do not assign any command to the HELD COMMAND columnLOGIC OUTPUT Here is what the screen should look like when you are finished TOGGLE OPERATION MUTE ALL EXAMPLE Likewise, here is the Macros page for the Vortex EF2241 MACROSBROADAB01MUTEI11 BROADAF00MUTEI11Page LOGIC INPUT Do not assign any command to the HELD COMMAND column LOGIC OUTPUT Page MOMENTARY OPERATION PUSH TO TALK LOGIC INPUT Page LOGIC OUTPUT Here is what the screen should look like when you are finished MOMENTARY OPERATION PUSH TO MUTE LOGIC INPUT If you are successful, you should see this on the screen LOGIC OUTPUT Here is what the screen should look like when you are finished MOMENTARY OPERATION MUTE ALL EXAMPLE Likewise, here is the Macros page for the Vortex EF2241 microphones on all units regardless of whether a microphone is muted from the Vortex EF2280 or the Vortex EF2241. To accomplish this, we will use the BROADA command to send MUTEI commands from one unit to the other unit. The BROADA command broadcasts any command that is after the colon. For example, if a Macro in the Vortex EF2241 has this command Page LOGIC INPUT Page Page LOGIC OUTPUT 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 membrane switch, the LED will stay lit until the switch is pushed and held down Polycom Installed Voice Business Group Contact Information TECHNICAL SUPPORT