Cloud Electronics 36-50 - Manual (Page 19)

36-50 Installation and User Guide V1.0 19
OPTIONS AND ADDITIONAL INFORMATION
RL-1 and RSL-6 Series remote
control plates – general
considerations
Cloud RL-1 Series and RSL-6 Series remote control plates
are available in three form factors, two fit single-gang UK or
American electrical back boxes respectively; the third is a 50 x
50 mm “Media” module, suitable for “Euro-module” mounting
frames available in most European countries. Back boxes of
either the recessed type or surface-mounting type may be
used, providing they are at least 25 mm deep.
The plates should be connected to the
REMOTE
SOURCE+LEVEL port of the relevant zone using single- or
twin-core screened cable as described at page 14 and page 15.
The plate terminations are conventional screw terminals and
the
REMOTE SOURCE+LEVEL port on the mixer is a 3-pin
5 mm-pitch screw terminal connector.
The remote control plates are passive and thus do not draw
any current from the mixer.
Control of music source and level via
external DC
It may be necessary in some installations to adjust the music
level and select music source in one or more zones from
an external control system (e.g., Crestron, AMX, etc.). If the
REMOTE SOURCE+LEVEL ports are not required for
RL-1/RSL-6 Series remote control plates, they may be used to
receive DC voltages from the external system to effect these
adjustments.
Both music source selection and level can be controlled over
their full ranges with a DC voltage of 0 to +10 V. The pinout of
the
REMOTE SOURCE+LEVEL port is as follows:
PIN USE
1 0 V ref.
2 Music level control (0 to +10 V)
3 Music source selection (0 to +10 V)
REMOTE
SOURCE+LEVEL
PORT
1
2
3
+15 V
0 V MUSIC VCA
MUSIC SOURCE
SELECT
4k7 15k
CONTROL
SYSTEM
0 V REF
LEVEL CONTROL
SOURCE CONTROL
36-50
NOTE: If the control voltage source is not isolated from the
power earth, there is a small risk of creating a ‘ground loop’
by linking the mixer technical ground (0 V) to the ground (0 V)
of the equipment supplying the control voltages. To minimise
this risk, we suggest that all pieces of equipment be in close
proximity, and supplied from the same power outlet.
Music level
Music level in a zone may be varied over its full range by
applying a DC voltage of between 0 V and +10 V to pin 2,
the 0 V reference being connected to Pin 1. 0 V on pin 2
corresponds to maximum level and +10 V will produce 60 dB
of attenuation. The rate of attenuation is approximately 165
mV/dB.
Note that there is an internal 4k7 “pull-up” resistor between
pin 2 and the internal +15 V rail. If pin 2 is left “floating”, this
pull-up will result in full attenuation. The output impedance of
the control voltage source should be low enough to overcome
the effect of this resistor.
Music source
Music source for a zone may be controlled by applying various
DC voltages of between 0 and +10 V to pin 3, the 0 V reference
being connected to pin 1. 0 V at pin 3 will select Line input
6 and between +7.5 and +9 V will select Line input 1. The
other line inputs will be selected with intermediate voltages.
Taking pin 3 above +9 V will deselect all inputs, making the
zone effectively ‘off’ for music.
The table below lists the DC voltages required at pin 3 to
select each line input. The third column is the value of a
resistor which should be connected between pins 1 and 3 to
permanently ‘force’ a zone to a particular line input.
INPUT DC VOLTAGE RESISTOR VALUE
OFF >+9.0 V
Line 1 +7.5 V 16k
Line 2 +6.0 V 11k
Line 3 +4.5 V 6k8
Line 4 +3.0 V 3k9
Line 5 +1.5 V 1k8
Line 6 0 V short-circuit
Note that there is an internal 15k “pull-up” resistor between
pin 3 and the internal +15 V rail. If pin 3 is left “floating”, this
pull-up will cause ‘OFF’ to be selected. The output impedance
of the control voltage source should be low enough to
overcome the effect of this resistor.