COBHAM DACS Manuale utente
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Digital Audio Control System
(DACS)
OPERATOR’S MANUAL
REV 1.10
IMPORTANT NOTICE
Chelton Avionics Inc. doing business as Wulfsberg
Electronics Division is responsible for full distribution and
revisions of ICA's (Instructions for Continued Airworthiness).
For inquires regarding the content and currency of this
manual contact Wulfsberg Electronics Division, 6400
Wilkinson Drive, Prescott, Arizona, 86301. Telephone (928)
756-1615 or refer to the following website:
www.wulfsberg.com for more information.
SEALED
2012.03.20
13:42:07
-07'00'
Published on
April 26, 2012
These commodities, technology or software are controlled in accordance with the United States Export Administration Regulations, Export Classification
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DACS Digital Audio Control System
Operators Manual
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page i
Prepared By: Checked By: Approved By:
Revisions
Rev.
ECR No.
Date
Description of Change
1.10 ECR11065 3-8-12 ECR 11065: Rewrote Section 3.5.1
1.00 10-7-10 Initial release.
Charles Horkin
2012.03.09
16:44:52 -08'00'
Allan prince
2012.03.09
17:31:23 -08'00'
Zack Pahlman
2012.03.13
17:50:58
-07'00'
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DACS Digital Audio Control System
Operators Manual
Rev: 1.00
DACS_813-0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page ii
Table of Contents
Section Title Page
1 Introduction.............................................................................................. 1
2 System Information ................................................................................. 1
3 ACP Controls and Indicators ................................................................. 3
3.1 ACP Faceplate Illumination .................................................................. 4
3.1.1 Day Mode Illumination................................................................... 4
3.1.2 Night Mode Illumination..................................................................4
3.1.3 NVG Mode Illumination...................................................................5
3.1.4 Legends Illumination ......................................................................5
3.2 Built-In Tests (BITs)..............................................................................5
3.2.1 Power-Up Built-In Test (PBIT)........................................................5
3.2.2 Continuous Built-In Test (CBIT) .....................................................5
3.3 Operational Criteria ..............................................................................5
3.4 ACP53 Front Panel Controls ................................................................6
3.4.1 Transceiver Radio Controls.............................................................6
3.4.2 Transmit Active Indicator.................................................................7
3.4.3 Receiver Radio Controls (ACP53 and ACP54 only)........................7
3.4.4 Mode Control (Users 1 and 2 Only).................................................8
3.4.5 Emergency Mode............................................................................ 8
3.4.6 VOX Control.................................................................................... 9
3.4.7 Transmit Selector Switch ..........................................................… . 10
3.4.8 TX/ICS PTT Switch ....................................................................… .10
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DACS Digital Audio Control System
Operators Manual
REV 1.00
DACS_813-.0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page iii
3.4.9 ISO/CALL Switch ........................................................................10
3.4.10 RX/ICS Volume Control ...........................................................… 11
3.4.11 CALL Indicator ............................................................................11
3.4.12 ISO Indicator ...............................................................................11
3.5 Isolation (ISO) Mode...........................................................................12
3.5.1 Crew/Passenger Talk Groups .......................................................12
3.5.2 ISO/CALL Switch ..........................................................................12
3.5.3 Call Priority................................................................................… 13
3.6 Transmit Features ..............................................................................13
3.6.1 User Priority ..................................................................................13
3.6.2 Transmit Time-Out ....................................................................... 13
4 Aural Alerts ............................................................................................14
4.1 Remote Alert Cancel (not on ACP)......................................................14
4.2 Remote Alert Inhibit (not on ACP) .......................................................16
4.3 Other Remote Switches (not on ACP).................................................16
5 ACP53 Specifications............................................................................16
5.1 Electrical Specifications......................................................................16
5.2 Physical Specifications ......................................................................17
5.3 Environmental Specifications .............................................................17
6 Abbreviations and Acronyms...............................................................18
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DACS Digital Audio Control System
Operators Manual
Rev: 1.00 Page 1
DACS_813-0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
1 Introduction
Information in this manual consists of the functional and operational procedures for the
COBHAM Digital Audio Control System (DACS).
2 System Information
DACS is a communications management system that distributes and controls all the
audio in an aircraft. This overview provides a basic understanding of how the system
functions.
CAUTION:
It is important that you confirm the specific criteria associated
with this installation with your installing agency.
At installation, a computer using COBHAM Device Configuration Software (DevCS) is
used to program specific user criteria for the required communications setup. The
number of radios, number and type of users, headset impedances, VOX control for the
passengers and numerous other options are defined at this time.
The Audio Management Unit (AMU) manages the audio to and from all transceivers,
receivers and audio warning sources; enables the transmission of microphone audio to
a selected transmitter and distributes all Inter-Communication System (ICS) audio.
The Audio Control Panel (ACP) is the operator interface which can be any
combination of up to six ACP53s.
The Remote Memory (RM) connects to the AMU and stores the system's
configuration and aural alert files remotely. This allows replacement of the AMU
without the necessity of reconfiguring the replacement unit.
An optional Passenger Intercom Amplifier (PIA) is available to allow up to twelve
additional passengers to be connected to the system.
The AMU, RM and PIA have no direct operator interface and information on these units
is available in their applicable Service Manual.
The following figure illustrates a typical DACS system hardware configuration however it
will vary depending on the specific criteria required.
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DACS Digital Audio Control System
Operators Manual
Rev: 1.00 Page 2
DACS_813-0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Figure 1: Typical Digital Audio Control System
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Operators Manual
Rev: 1.00 Page 3
DACS_813-0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
3 ACP Controls and Indicators
ACP53-xxx
The ACP53-xxx is an Audio Control Panel for the DACS. The ACP51-xxx and
ACP54-xxx are variants of the ACP53-xxx.
ACP51-xxx
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Operators Manual
Rev: 1.00 Page 4
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CONFIDENTIAL AND PROPRIETARY TO COBHAM
ACP54-xxx
All ACP installed features operate in the same manner unless otherwise noted in the
text of this manual or the feature is unique to a particular model.
The faceplate of the ACP supports replaceable legends for the receivers and the
transceivers. This enables the installing agency to change the names of the radio
controls to match the radios installed on the aircraft.
3.1 ACP Faceplate Illumination
The illumination of the ACP faceplate indicators (selected Transceiver, TX, ISO and
CALL LEDs) depend on the specific mode selected, Day, Night or NVG. The legends
illumination is controlled by the backlighting bus.
3.1.1 Day Mode Illumination
When in Day mode, the ACP indicators are at sunlight readable levels. By adjusting
the aircraft dimming bus either Day or Night mode level of illumination is available.
3.1.2 Night Mode Illumination
To enable Night mode adjust the aircraft dimming bus or select an external Night
mode switch. The ACP indicators illumination level is constant and at a significantly
reduced level compared to the Day mode levels.
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DACS Digital Audio Control System
Operators Manual
Rev: 1.00 Page 5
DACS_813-0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
3.1.3 NVG Mode Illumination
To enable NVG mode select an external NVG mode switch. The ACP indicators
illumination level is constant and at a reduced level compared to the Night mode
levels.
3.1.4 Legends Illumination
The legends illumination is controlled by the backlighting bus.
3.2 Built-In Tests (BITs)
3.2.1 Power-Up Built-In Test (PBIT)
On power-up, the ACP runs a PBIT to confirm correct operation of the unit and all ACP
indicators will illuminate for a period of approximately three seconds.
If the ACP has not established connection to other components in the audio system
three seconds after the power is applied then the ACP indicators will extinguish until
connection is achieved.
3.2.2 Continuous Built-In Test (CBIT)
The ACP requires serial communication with the AMU. If serial communications with the
AMU is lost for more than 0.5 seconds all the ACP indicators will extinguish and remain
off unless communication is re-established.
3.3 Operational Criteria
It is important to be aware the functions described may differ depending on how the
AMU has been configured through the DevCS during installation. Within the audio
system the ACP may have different features depending on the user status of each
specific unit. Normally the pilot and copilot will be designated User 1 and User 2
respectively.
Confirm the specific criteria associated with this installation with your installing
agency.
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DACS Digital Audio Control System
Operators Manual
Rev: 1.00 Page 6
DACS_813-0100
CONFIDENTIAL AND PROPRIETARY TO COBHAM
3.4 ACP 53 Front Panel Controls
3.4.1 Transceiver Radio Controls
The ACP has up to eight Transceiver Receive audio volume controls with
interchangeable illuminated labelling to allow selection of suitable legends.
Each control is an edge-lit rotary plastic knob that is used to control the volume for a
specific transceiver. Rotating the knob clockwise (cw) will increase the volume and
counter-clockwise (ccw) will decrease the volume. The master RX Volume control can
be used to effect a global adjustment to all Transceiver volumes (see section 3.4.10).
Each control has a push-on/push-off action to allow individual selection of the required
transceivers. In the on position the control knob is extended, the volume for the
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