3
NOTE:
S4 is available for custom applications. When S4 is in the ON position, pad W4 is connected to pad W5 (see Figure 10).
MX392 LOGIC TERMINAL DEFINITIONS (Figure 6)
LOGIC GND Terminal:
Connects to the logic ground of an auto-
matic mixer, switcher, or other equipment. Can be modified to pre-
vent ground loops.
SWITCH OUT Terminal:
Provides a TTL logic low when the mem-
brane 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.
LED IN Terminal:
Can be modified to remotely control the LED by
flipping DIP switch S3 in the microphone to the ON position. As
supplied, the LED IN terminal draws 5 Vdc. When this is shorted to
the LOGIC GROUND terminal, the LED turns on.
MX392 LOGIC MODIFICATIONS
Open the microphone as shown in Figure 2.
Changing SWITCH OUT Terminal to Always Momentary
To accommodate interface equipment requiring momentary clo-
sure of the microphone (even when the desired microphone func-
tion is latching on/off), proceed as follows:
1.
Remove R45 from the top of the circuit board.
2.
Reinstall R45 at location R46 on the top of the circuit board.
SWITCH BEHAVIOR
LED BEHAVIOR
DIP SWITCH SETTINGS
Push to Mute, Release to Talk (As Shipped)
LED on when microphone is active
Push to Talk, Release to Mute
LED on when microphone is active
Toggle: Push On/Push Off
LED on when microphone is active
Microphone Always Active (switch available
for logic functions only)
LED Always OFF
Initially Muted
Initially Active
SWITCH BEHAVIOR
USER ACTION REQUIRED
DIP SWITCH SETTINGS
Switch Deactivated,
Microphone Always Active
Short LED IN terminal to LOGIC GROUND terminal
LED Always ON
Automatic Mixer Mode (MX392 models only)
Connect SWITCH OUT signal to various logic in-
puts of automatic mixer for custom functions
Connect mixer channel GATE OUT to microphone
LED IN. LED on microphone turns on when its
channel is gated on
Switch out is logic
low while switch is
pressed
Switch toggles
switch out to
logic low
