Shure SCM810 User Manual page 10
Automatic microphone mixer
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Also See for SCM810:
- User manual (17 pages) ,
- Manual (14 pages) ,
- Specification sheet (2 pages)
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The SCM810's Advanced Functions are recommended only for those who are technically knowledgeable and familiar
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 publi-
cation is available by contacting Shure's Applications Group.)
The following 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 9A).
+5 V
10K
GATE
OUT
FROM
SCM810
CIRCUIT
LOGIC
GROUND
A
LOGIC EQUIVALENT CIRCUIT DIAGRAMS
FIGURE 9
MUTE IN: Applying logic "low" (from GATE OUT or a switch
closure to logic ground) gates channel off (see Figure 9B).
Channel output drops to - .
OVERRIDE IN: Applying logic "low" (from GATE OUT or a
switch closure to logic ground) forces channel on (see Figure
9B). Factory setting provides that when both Mute and Over-
ride are activated, Mute takes precedence (see Internal Modi -
fications for Override precedence).
LOGIC GROUND: Logic ground is distinct from the SCM810 au-
dio ground. Make all logic ground connections to this pin, includ-
ing power supply ground of external logic circuitry. To avoid
switching clicks, d o n ot connect logic ground to audio, chassis or
rack grounds.
Logic controls are accessed at the DB-25 multi-pin connec-
tor on the rear panel (Figure 10). The pin connections are giv-
en in the following table.
ADVANCED FUNCTIONS
with audio electronics.
+5 V
55K
MUTE IN
TO
OR
SCM810
OVERRIDE
CIRCUIT
IN
B
GATE 1
GATE 3
MUTE 1
MUTE 3
O'RIDE 2
MUTE 2
GATE 2
O'RIDE 1
O'RIDE 3
LOGIC CONNECTOR
LOGIC CONNECTIONS
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 5
GATE 7
LOGIC
GROUND
MUTE 5
MUTE 7
O'RIDE 4
O'RIDE 6
O'RIDE 8
MUTE 4
MUTE 6
MUTE 8
GATE 4
GATE 6
GATE 8
O'RIDE 5
O'RIDE 7
FIGURE 10
Input
Connector Pin No.
Channel
1
1
2
15
3
4
4
18
5
7
6
21
7
10
8
24
1
14
2
3
3
17
4
6
5
20
6
9
7
23
8
12
1
2
2
16
3
5
4
19
5
8
6
22
7
11
8
25
all
13
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