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11
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 control options. Logic can be used for everything from sim-
ple cough switches to elaborate computer-controlled room
systems. (Shure’s
AMS Update
publication contains addition-
al applications of advanced logic. This publication is available
by contacting the Shure Applications Department.) The follow-
ing logic functions are available for each channel:
GATE OUT: Follows channel gating and goes to logic “low”
(sinks current) when microphone is gated on. 500 mA of cur-
rent sinking ability is provided (see Figure 18A).
MUTE IN: Applying logic “low” (from GATE OUT or a switch
closure to logic ground) gates channel off (see Figure 18B).
Channel output drops to -∞.
GATE
OUT
LOGIC
GROUND
MUTE IN
OR
OVERRIDE
IN
55K
10K
+5 V
+5 V
TO
SCM410
CIRCUIT
FROM
SCM410
CIRCUIT
AB
LOGIC EQUIVALENT CIRCUIT DIAGRAM
FIGURE 18
OVERRIDE IN: Applying logic “low” (from GATE OUT or a switch
closure to logic ground) forces channel on (see Figure 18B).
When both Mute and Override are activated, Mute takes prece-
dence (see
Internal Modifications
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 external 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 19). Pin connec-
tions are shown in the following table.
LOGIC CONNECTOR
FIGURE 19
LOGIC CONNECTIONS
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