Advanced Functions; Logic Connection Specifications - Shure SCM810 User Manual

The SCM810's Advanced Functions are recommended only for those who are technically knowledgeable and familiar with audio

LOGIC CONNECTION SPECIFICATIONS

The logic functions of the SCM810 expand the mixer's 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 publication contains additional applications of advanced logic. This
publication is available by contacting Shure's Applications Group.) The fol-
lowing 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 current sinking ability is provided
(see Figure 10A).
+5 V
10K
GATE
OUT
FROM
SCM810
CIRCUIT
LOGIC
GROUND
A
LOGIC EQUIVALENT CIRCUIT DIAGRAMS
MUTE IN: Applying logic "low" (from GATE OUT or a switch closure to logic
ground) gates channel off (see Figure 10B). Channel output drops to -∞.
OVERRIDE IN: Applying logic "low" (from GATE OUT or a switch closure
to logic ground) forces channel on (see Figure 10B). Factory setting pro-
vides that when both Mute and Override are activated, Mute takes prece-
dence (see Internal Modifications for Override precedence).
LOGIC GROUND: Logic ground is distinct from the SCM810 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.
+5 V
55K
MUTE IN
OR
OVERRIDE
IN
B
FIGURE 10

ADVANCED FUNCTIONS

electronics.
Logic controls are accessed at the DB-25 multi-pin connector on the rear
panel (Figure 11). The pin connections are given in the following table.
TO
SCM810
CIRCUIT
Logic Function
GATE OUT1
GATE OUT 2
GATE OUT 3
GATE OUT 4
GATE OUT 5
GATE OUT 6
GATE OUT 7
GATE OUT 8
OVERRIDE IN 1
OVERRIDE IN 2
OVERRIDE IN 3
OVERRIDE IN 4
OVERRIDE IN 5
OVERRIDE IN 6
OVERRIDE IN 7
OVERRIDE IN 8
MUTE IN 1
MUTE IN 2
MUTE IN 3
MUTE IN 4
MUTE IN 5
MUTE IN 6
MUTE IN 7
MUTE IN 8
Logic Ground
10
GATE 1 GATE 3 GATE 5 GATE 7
MUTE 1 MUTE 3 MUTE 5
O'RIDE 2 O'RIDE 4 O'RIDE 6
MUTE 2 MUTE 4 MUTE 6
GATE 2 GATE 4 GATE 6
O'RIDE 1 O'RIDE 3 O'RIDE 5 O'RIDE 7
LOGIC CONNECTOR
FIGURE 11
LOGIC CONNECTIONS
Input
Channel
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
all
LOGIC
GROUND
MUTE 7
O'RIDE 8
MUTE 8
GATE 8
Connector Pin No.
1
15
4
18
7
21
10
24
14
3
17
6
20
9
23
12
2
16
5
19
8
22
11
25
13