Advanced Functions; Logic Connection Specifications - Shure SCM410 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 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
10K
GATE
OUT
FROM
SCM410
CIRCUIT
GROUND
LOGIC EQUIVALENT CIRCUIT DIAGRAM
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 Addendum 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
10
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