11
ADVANCED FUNCTIONS
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 -
.
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 CONNECTIONS
CAUTION
: Use of Advanced Functions is recommended only for qualified audio technicians.
55K
10K
+5 V
+5 V
A
B
LOGIC EQUIVALENT CIRCUIT DIAGRAM
FIGURE 5
FROM
SCM410
CIRCUIT
GATE
OUT
LOGIC
GROUND
MUTE IN
OR OVER-
RIDE IN
TO
SCM410
CIRCUIT
LOGIC CONNECTOR
FIGURE 6
Pin
No.
Logic Function
Logic Function
Pin
No.
1
OVERRIDE IN 1
GATE OUT 1
6
2
OVERRIDE IN 2
GATE OUT 2
7
3
OVERRIDE IN 3
GATE OUT 3
8
4
GATE OUT 4
GATE OUT 4
4
5
LOGIC GROUND
OVERRIDE IN 1
1
6
GATE OUT 1
OVERRIDE IN 2
2
7
GATE OUT 2
OVERRIDE IN 3
3
8
GATE OUT 3
OVERRIDE IN 4
14
9
NO CONNECTION
MUTE IN 1
11
10
MUTE IN 4
MUTE IN 2
12
11
MUTE IN 1
MUTE IN 3
13
12
MUTE IN 2
MUTE IN 4
10
13
MUTE IN 3
LOGIC GROUND
5
14
OVERRIDE IN 4
NO CONNECTION 15
15
NO CONNECTION
NO CONNECTION 9
Summary of Contents for SCM410E
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