B&B Electronics 3PXCC2a Especificaciones descargar pdf (Pagina 7)

BOARD SET-UP AE/LZB 119 1894 R1A

Digital Potentiometers’ Settings

To provide computer-controlled level settings, the

Enhanced Audio Enclosure's audio input and output circuits

incorporate 256-position digitally-controlled potentiometers.

These digital pots, located on the Audio System Board,

allow adjustment of the Enhanced Audio Enclosure's audio

levels via the PC. Adjustments include dispatcher-adjustable

audio levels such as headset sidetone volumes and system-

level adjustments such as line input and output levels to and

from the CEC/IMC Digital Audio Switch.

With the exception of the dispatcher's headset sidetone

volume adjustments, none of the digital pots provide volume

adjustments for the speaker or headset earphone audio levels

during normal dispatch operations. Speaker and headset

volume adjustments are accomplished at the respective

speaker or headset via mechanical pots.

NOTE

Communication module volume changes at the

C3 Maestro effect CEC/IMC CIM line output

levels, not the digital pots within the Enhanced

Audio Enclosure.

Fifteen (15) dual digital potentiometer chips (integrated

circuits) are located on the Audio System Board for a total

of thirty (30) individual pots; there are no mechanical

potentiometers. All audio level adjustments are

accomplished via software. See Table 4. A dispatcher may

adjust the operator's sidetone digital pot using dedicated

keyboard keystrokes <Alt> <Vol ↑ > and <Alt> <Vol ↓ > at

the Dispatch Keyboard or via pointing device (mouse/track-

ball/touch-screen) actions upon the console’s graphical user

interface.

All of the digital pots initially power-up with the wiper

in a 50% or centered position. The microcontroller on the

Audio System Board then immediately loads each pot in

accordance with its respective setting stored in a "working"

area of a serial EEPROM chip on the board. The EEPROM

also contains an unchangeable "default" digital pot storage

area. When shipped from the factory, the working area

matches the default area.

Digital pots can be adjusted via the console’s Dispatch

Manager program. This function changes the settings stored

in the EEPROM's working area. This function should only

be accomplished by well-trained installation and/or service

personnel. To change digital pots’ settings, the following

procedure may be performed after the console's installation

is complete, it is powered-up, the console application

software is executing, and the PC-to-Enhanced Audio

Enclosure serial data link is active:

1. At the standard PC keyboard, use one or more

Windows NT <Alt><Tab> keystrokes to switch to

the console’s Dispatch Manager program.

2. Using the mouse, click Pots on the menu or simply

press <Alt> P on the PC keyboard. Either action

will display the Digital Pots Adjustment dialog

box.

3. From the dialog box’s drop-down list box, select a

digital pot which requires a setting change. See

Table 4. The digital pot's existing setting is

displayed in the small text box. If a mouse is not

available, use the ↑ or ↓ arrow keys on the PC

keyboard for digital pot selection.

4. Change the selected digital pot’s setting by clicking

the four (4) adjustment buttons as necessary. If a

mouse is not available, simply <Tab> to the

required button and press <Enter>. Repeat as

necessary.

Alternately, if restoration to the factory default

setting is required click the <Default> button. If a

mouse is not available, <Tab> to this button and

press the <Enter> key. Either action will cause the

pot’s EEPROM-stored factory default setting to be

copied as EEPROM-stored working setting. Other

pots’ settings are not altered.

5. Repeat steps 3 and 4 as necessary for any other

digital pots which require setting changes.

6. Click the <Done> button to exit the dialog box and

save changes. If a mouse is not available, <Tab> to

this button and press the <Enter> key. Changes are

saved in the EEPROM's working area as they are

made.

SPEAKER ASSEMBLY

Normally, a Speaker Assembly used with the Enhanced

Audio Enclosure is configured at the factory with its

minimum volume feature enabled and its maximum volume

output power set to 2 watts. This configuration is

accomplished by setting two positions on a 4-position DIP

switch located on the Speaker Amp Board within the

Speaker Assembly.

NOTE

The following information lists the normal factory

settings and the optional settings which are

available.

Speaker Amp Board

At each Speaker Assembly, a 4-position DIP switch

identified as SW1 is located on the Speaker Amp Board.

One position is used to enable or disable the minimum

volume level feature. A second position allows setting of the

maximum volume level to either 2 or 5 watts of output

NOTE

1 2 3 4 5 6 7 8 9 10 11 12 ... 47 48

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