Advanced Functions; Logic Connection Specifications - Shure SCM410E User Manual

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 control
options. Logic can be used for everything from simple cough switches to
elaborate computer-controlled room systems. (Shure's AMS Update pub-
lication contains additional applications of advanced logic. This publica-
tion 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
10K
GATE
OUT
FROM
SCM410
CIRCUIT
GROUND
LOGIC EQUIVALENT CIRCUIT DIAGRAM
OVERRIDE IN: Applying logic "low" (from GATE OUT or a switch closure
to logic ground) forces channel on (see Figure 5B). When both Mute and
Override are activated, Mute takes precedence (see Internal Modifica-
tions 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

ADVANCED FUNCTIONS

B
+5 V
55K
MUTE IN
OR OVER-
RIDE IN
LOGIC
FIGURE 5
FIGURE 6
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
TO
12 MUTE IN 2
SCM410
13 MUTE IN 3
CIRCUIT
14 OVERRIDE IN 4
15 NO CONNECTION
11
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