Shure MX300 manual Internal DIP Switch Functions Figure, MX392 Logic Terminal Definitions Figure

INTERNAL DIP SWITCH FUNCTIONS (FIGURE 5)

All MX392 and MX393 models have internal DIP switches that allow the user to program the On/Off switch so that it fits the application. To gain access to the DIP switches, remove the grille retainer screw, the grille retainer, the foam screen, and the grille, as shown in Figure 2.

MX392 LOGIC TERMINAL DEFINITIONS (FIGURE 6)

LOGIC GND Terminal: Connects to the logic ground of an automatic mixer, switcher, or other equipment. Can be modified to prevent ground loops. Refer to the ªMX392 Log- ic Modificationsº paragraph.

SWITCH OUT Terminal: 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 pro- vides a momentary closure when S1 is Off and a latching clo- sure when it 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

To gain access to the logic terminals, remove the grille re- tainer screw, the grille retainer, foam screen, and grille, as shown in Figure 2.

Isolating Logic Ground from Audio Ground

1.Remove jumper R40 from the top of the circuit board.

2.Make sure LOGIC GND terminal connects to the logic ground of the automatic mixer, switcher, or other equip- ment.

Changing SWITCH OUT Terminal to Always Momentary

To accommodate interface equipment requiring momen- tary closure of the microphone (even when the desired mi- crophone function 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.

Custom Switch Modifications

S4 is available for custom logic modifications. When S4 is in the ON position, pad W4 is connected to pad W5.

DESIRED MICROPHONE FUNCTION	USER ACTION REQUIRED		DIP SWITCH SETTINGS
Push to Mute (As Shipped)	Press and hold switch to temporarily mute micro-	S1 = OFF
	phone; release switch to unmute	S2	= OFF
	LED turns on when microphone is active
		S3	= OFF
		S4	= OFF
Push to Talk	Press and hold switch to activate microphone;	S1 = OFF
	release switch to mute	S2	= ON
	LED turns on when microphone is active
		S3	= OFF
		S4	= OFF
Push On/Push Off	Press switch to toggle microphone on or off	S1 = ON,
	LED turns on when microphone is active	S2 = ON for muted initial state
		S2	= OFF for active initial state
		S3	= OFF
		S4	= OFF
Switch Deactivated, Microphone Always	LED Always OFF	S3 = ON
Active		S4 = OFF
Switch Deactivated, Microphone Always	Short LED IN terminal to LOGIC GROUND termi-	S3 = ON
Active	nal	S4 = OFF
	LED Always ON
Automatic Mixer Mode (MX392 models	If S1=OFF, SWITCH OUT signal will be momen-	S1 = ON or OFF
only)	tarily logic low when switch is pressed	S3 = ON
	If S1=ON, SWITCH OUT signal will be latching
		S4 = OFF
	logic low when switch is pressed
	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

NOTE: S4 is available for custom applications.

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