Cloud Electronics Z4MK3 - Manual (Page 19)

Z4-8 MK3 Installation and User Guide 19
RL-1 Series 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. 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
Z4 MK3 /Z8 MK3
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 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.