COBHAM DACS Bedienungsanleitung

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

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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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Operators Manual

Rev: 1.00 Page 2

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CONFIDENTIAL AND PROPRIETARY TO COBHAM

Figure 1: Typical Digital Audio Control System

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Operators Manual

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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

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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

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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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