Advanced Functions, Logic Connection Specifications

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

SCM410E, SCM410 specifications

The Shure SCM410 and SCM410E are state-of-the-art automatic microphone mixers designed to enhance audio performance in various professional environments. Known for their reliability and advanced features, these mixers are a popular choice for broadcasters, conferencing systems, and live event productions.

One of the key features of the SCM410 is its Automatic Gain Control (AGC) system, which intelligently adjusts the gain of connected microphones based on their audio levels. This ensures that the output remains consistent, making it ideal for situations where multiple speakers might share the microphone, such as panel discussions or meetings. The SCM410E variant further enhances this functionality with extended connectivity options, catering to more complex audio setups.

Both models incorporate Shure's exclusive IntelliMix technology. IntelliMix employs sophisticated algorithms to minimize interference and eliminate feedback, which is crucial for maintaining intelligibility in crowded sound environments. The mixers automatically manage the microphone levels, activating only those that are in use while suppressing those that are not, which not only enhances audio clarity but also helps in reducing background noise.

The SCM410 features four microphone inputs, allowing operators to connect multiple microphones simultaneously. Users can easily control each input's level, with individual gain adjustments and a master output level control. Additionally, LEDs provide visual feedback on the status of each microphone, indicating when they are active or inactive. The SCM410E goes a step further, offering additional mic input options and enhanced flexibility for integration into larger systems.

Durability is a hallmark of the SCM410 and SCM410E, as they are constructed with high-quality materials, designed to withstand the rigors of professional use. The intuitive interface makes them accessible for both novice users and seasoned sound engineers.

With a phantom power switch for condenser microphones, an easy-to-read, backlit display, and robust connectivity options, the SCM410 and SCM410E are versatile tools for any audio setup. Their ability to automatically mix and control audio levels in real-time ensures that users can deliver presentations, discussions, and performances with clarity and confidence. Whether it’s in a corporate boardroom or a live concert venue, these automatic microphone mixers deliver high-quality sound tailored to the needs of modern audio applications.