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

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 addi-
tional applications of advanced logic. This publication is avail-
able 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 current
sinking ability is provided (see Figure 10A).
+5 V
10K
GATE
OUT
FROM
SCM810
CIRCUIT
LOGIC
GROUND
A
LOGIC EQUIVALENT CIRCUIT DIAGRAMS
FIGURE 10
MUTE IN: Applying logic "low" (from GATE OUT or a switch clo-
sure to logic ground) gates channel off (see Figure 10B). Chan-
nel output drops to -∞.
OVERRIDE IN: Applying logic "low" (from GATE OUT or a switch
closure to logic ground) forces channel on (see Figure 10B). Fac-
tory setting provides that when both Mute and Override are acti-
vated, Mute takes precedence (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.

ADVANCED FUNCTIONS

with audio electronics.
+5 V
55K
MUTE IN
TO
OR
SCM810
OVERRIDE
CIRCUIT
IN
B
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.
GATE 1 GATE 3
MUTE 1
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 3 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 11
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