Cloud 24 Series User Manual

24 Series Installation and User Guide V1.0
23
24 SERIES SERIAL CONTROL
24 Series mixer-ampliers are equipped with a bi-directional
RS-232 serial interface.
As a receiver, the interface permits external control of many
mixer-amplier settings. These include:
• Music Source selection in each zone
• Music level control in each zone
• Mic level control in each zone
• Mic muting in each zone
Note that the rear panel Remote/Local switches ([20] at page
11) must be set to Remote to enable RS-232 control.
The mixer-amplier appears as a DCE (Data Communications
Equipment) device to controlling equipment. As the
controlling device will probably be congured as a DTE device,
this requires the use of a straight (uncrossed) cable with the
Tx (Data Transmit) pins at the cable ends connected to each
other and the Rx pins (Data Receive) similarly connected to
each other.
The full RS-232 protocol is beyond the scope of this manual,
but is available for download from www.cloud.co.uk. This
section provides only serial port details and an abridged serial
command list.
Port parameters:
Parameter VALUE/SETTING
Data type: RS-232 serial
Data speed 9600 baud*
Word length 8 bits
Parity None
Stop bits One
*The default baud rate of 9600 baud may be altered by sending the
appropriate RS-232 commands; details are in the RS-232 protocol document.
Abridged command set
The commands listed in the table below are some of those
most commonly required when controlling a 24 Series mixer-
amplier from an AV control system. For all other commands,
data requests and responses, please refer to the 24 Series’ full
RS-232 protocol document.
GENERAL FORMAT
FUNCTION COMMAND
(ASCII)
Route Line Input x to Zone y
<Zy.MU,Sx/>
Set music level in Zone y to –m dB
<Zy.MU,Lm/>
Reduce music level in Zone y by p dB
<Zy.MU,LDp/>
Increase music level in Zone y by q dB
<Zy.MU,LUq/>
Mute mic input for Zone y
<Zy.M1,M/>
Unmute Mic input for Zone y
<Zy.M1,O/>
Set mic level in Zone y to –m dB
<Zy.MI,Lm/>
Reduce mic level in Zone y by p dB
<Zy.MI,LDp/>
Increase mic level in Zone y by q dB
<Zy.MI,LUq/>
Examples
1. Music source selection:
The values of x and y in the general format are the Line Input
No. (1 to 4) and the Zone No. (1 or 2) respectively.
EXAMPLE COMMAND (ASCII) COMMAND (HEX)
Select Input 3
in Zone 2
<Z2.MU,S3/>
3C 5A 32 2E 4D 55
2C 53 33 2F 3E
2. Music levels:
Levels can either be set in a specied zone to an absolute
value (in dBs), or increased/decreased by a specied number
of dBs. Either may be dened in steps of 1 dB.
For absolute levels, the number of dBs corresponds to
attenuation rather than gain, thus 0 dB is maximum level and
at -90 dB the zone is muted. The values of y in the general
format is the Zone No. (1 or 2) and m is the attenuation level
in one-dB steps (0 to 90) respectively.
To alter the zone level by a specied amount, the additional
ASCII characters ‘U’ (up) or ‘D’ (down) are added to the string.
The values of y, p and q in the general format are the Zone
No. (1 or 2), the level increase in one-dB steps (0 to 90), or
the level decrease in one-dB steps (0 to 90) respectively. A
command to increment the level by a number of dBs greater
than the current attenuation will set the level to maximum.
Similarly, a command that would decrement the level below
90 dB attenuation will mute the Zone output.

Cloud 24 Series Specifications

General

Type	Power Amplifier
Channels	2
Signal-to-Noise Ratio	>100dB
Damping Factor	>200
Frequency Response	20Hz - 20kHz
Input Impedance	20k ohms
Cooling	Convection

Summary

IMPORTANT SAFETY INSTRUCTIONS

SAFETY INFORMATION

Safety Notes regarding Installation

Guidance on safe installation practices, including avoiding moisture, heat, and ensuring proper ventilation.

Conformities

Details compliance with European EMC and electrical safety standards for the product.

RoHS and WEEE declaration

Information on compliance with regulations regarding hazardous substances and electronic waste.

Safety Considerations and Information

General safety advice, including earthing requirements and handling of high voltage.

Caution - High Voltage

Warning about touching terminals with hazardous live symbols when power is supplied.

Caution - Mains Fuse

Instructions for replacing the IEC receptacle fuse and advice on potential faults.

Caution - Servicing

Emphasizes that the unit has no user-serviceable parts and requires qualified personnel for repairs.

OVERVIEW

Introduction

Brief introduction to the 24 Series mixer-amplifiers and their applications.

Applicable Models

Lists the specific models covered by this installation and user guide.

24 Series main features

Highlights the key features and capabilities of the 24 Series mixer-amplifiers.

Available Options

Lists optional accessories and modules compatible with the 24 Series.

What's in the box

Details the items included in the product packaging.

Schematic Diagram

Visual representation of the unit's internal signal flow and connections.

Front panel description

Explanation of the controls and indicators located on the front of the unit.

Rear panel description

Description of the connectors, switches, and indicators on the rear of the unit.

INSTALLATION

Hardware considerations

Guidance on rack mounting, depth requirements, and placement for optimal access and performance.

Ventilation

Information on cooling systems, ambient temperature limits, and ensuring adequate airflow.

Power Supply

Details on the universal power supply, voltage and frequency compatibility, and energy efficiency.

Fuses and ratings

Information on the accessible mains fuse and internal fuses for power supply protection.

Connections and Controls

Music Inputs

Describes the four stereo line inputs and their characteristics.

Sensitivity & Gain Control

Explains rear panel gain controls for line input sensitivity and signal level indication.

Music Source Select

Details front panel and remote control options for selecting music sources.

Music Level Control

Describes front panel controls for adjusting music volume in each zone.

Remote control of music source and level

Explains compatibility with remote control plates for source and level adjustments.

Music Equalisation

Describes rear panel controls for adjusting bass and treble for music signals.

Music Priority

Explains how Line Input 4 can be set to automatically mute other sources.

Microphone Input

Details the microphone input, its impedance, and phantom power capability.

Microphone level controls

Describes front panel controls for adjusting microphone volume per zone.

Microphone Equalisation

Describes rear panel EQ controls for adjusting microphone signal frequency response.

Paging control and mic priority

Explains DIP switch settings for paging mode and mic-over-music priority.

Microphone Access Input

Describes the PAGING ACCESS connector for contact-closure paging microphones.

Outputs

Speaker Outputs

Details the low-impedance and high-voltage speaker outputs and protection features.

Connecting to Lo-Z loudspeakers

Instructions for connecting 4 or 8 ohm loudspeakers, including load impedance warnings.

Connecting to 70/100 V-line systems

Instructions for connecting 70/100 V-line systems, including high-pass filter usage.

Power Sharing (Model 24-120 only)

Explains how the 24-120 model can share its total power between zones in Hi-Z mode.

Auxiliary Output

Describes auxiliary outputs for driving additional amplifiers or for recording.

Utility Output

Details the utility output for loop amplifiers or secondary area speakers.

Facility Port

Connecting an active remote module

Guidance on connecting remote active modules like LM-2, BT-1, L-1, and M-1.

Options and Additional Information

Multi-zone Applications

Advice on using multiple 24 Series units for multi-zone sound systems.

Music Mute (Fire Alarm Interface)

Explains the Music Mute input for integration with fire alarm systems.

Auto Power Down

Details the energy-saving Auto Power Down feature and its activation.

Control of music source and level via external DC

Explains how to control music source and level using external DC voltages.

Using the Facility Port as an auxiliary input

Describes using the Facility Port as a general-purpose auxiliary balanced line input.

24 SERIES SERIAL CONTROL

Abridged command set

Provides a list of common RS-232 commands for controlling the mixer-amplifier.

APPENDIX

PCB jumper locations

Diagrams showing the locations of internal PCB jumpers for configuration.

Table of internal jumpers and default settings

Lists internal jumpers, their purposes, locations, and factory default settings.

Troubleshooting

Status LED flashes GREEN - Output Power reduced

Explanation of reduced output power indicated by a flashing green STATUS LED.

Status LED flashes RED - Over-temperature Shutdown

Explanation of amplifier shutdown due to over-temperature indicated by flashing red LED.

Status LED flashes RED - Amplifier output protection

Details protection schemes like short circuit, over-current, and DC protection.

EMC Considerations

Advice on minimizing electromagnetic interference when installing the unit.

Earthing

Guidelines for proper earthing to prevent ground loops and hum.

TECHNICAL SPECIFICATIONS

Line Inputs

Specifications for frequency response, sensitivity, impedance, and headroom of line inputs.

Microphone Input

Specifications for microphone input frequency response, sensitivity, impedance, and phantom power.

Facility Input

Specifications for frequency response, sensitivity, impedance, and noise gate of the facility input.

Main Output

Specifications for output power, minimum load, frequency response, and protection for main outputs.

Power consumption

Details power consumption figures for standby, idle, and various output levels.

Heat Loss

Provides heat loss figures in kJ/hr and BTU/hr for different operating states.

Dimensions

Lists the net and shipping dimensions of the mixer-amplifier units.

Weights

Specifies the net and shipping weights of the mixer-amplifier units.