Shure SCM410E manual Advanced Functions, Logic Connection Specifications, Logic Connections

ADVANCED FUNCTIONS

CAUTION: Use of Advanced Functions is recommended only for qualified audio technicians.

LOGIC CONNECTION SPECIFICATIONS

The SCM410 logic functions expand the range of installation and con- trol options. Logic can be used for everything from simple cough switches to elaborate computer-controlled room systems. (Shure's AMS Update publication contains additional applications of advanced logic. This publi- cation is available by contacting the Shure Applications Department.) The following logic functions are available for each channel:

GATE OUT: Follows channel gating and goes to logic “low” (sinks cur- rent) when microphone is gated on. 500 mA of current sinking ability is provided (see Figure 5A).

MUTE IN: Applying logic “low” (from GATE OUT or a switch closure to logic ground) gates channel off (see Figure 5B). Channel output drops to -∞.

A	+5 V	B	+5 V
	10K		55K
	GATE	MUTE IN	TO
		OR OVER-
			SCM410
	OUT	RIDE IN
			CIRCUIT
FROM
SCM410
CIRCUIT	LOGIC
	GROUND

LOGIC CONNECTIONS

Pin	Logic Function
No.
1	OVERRIDE IN 1
2	OVERRIDE IN 2
3	OVERRIDE IN 3
4	GATE OUT 4
5	LOGIC GROUND
6	GATE OUT 1
7	GATE OUT 2
8	GATE OUT 3
9	NO CONNECTION
10	MUTE IN 4
11	MUTE IN 1
12	MUTE IN 2
13	MUTE IN 3
14	OVERRIDE IN 4
15	NO CONNECTION

Logic Function	Pin
	No.
GATE OUT 1	6
GATE OUT 2	7
GATE OUT 3	8
GATE OUT 4	4
OVERRIDE IN 1	1
OVERRIDE IN 2	2
OVERRIDE IN 3	3
OVERRIDE IN 4	14
MUTE IN 1	11
MUTE IN 2	12
MUTE IN 3	13
MUTE IN 4	10
LOGIC GROUND	5
NO CONNECTION	15
NO CONNECTION	9

LOGIC EQUIVALENT CIRCUIT DIAGRAM

FIGURE 5

OVERRIDE IN: Applying logic “low” (from GATE OUT or a switch clo- sure to logic ground) forces channel on (see Figure 5B). When both Mute and Override are activated, Mute takes precedence (see Internal Modifi- cations for Override precedence).

LOGIC GROUND: Logic ground is distinct from audio ground. Make all logic ground connections to this pin, including power supply ground of ex- ternal logic circuitry. To avoid switching clicks, do not connect logic ground to audio, chassis or rack grounds.

Logic controls are accessed through the high density DB-15 multi-pin connector on the rear panel (Figure 6). Pin connections are shown in the following table.

LOGIC CONNECTOR

FIGURE 6

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