Extron electronics MPX 423 A Instruções de Operação descarregar pdf (Página 23)

MPX 423 A • Operation

3-7

The volume adjustment is speed sensitive. To avoid large audible volume jumps

when the volume knob is turned quickly, the volume changes by smaller steps.

Audio mute (Output 1 only)

The Mute button toggles between mute and un-mute for audio output 1. The

indicator LED to the right of the button lights when the audio is muted. If a muted

output is not at maximum attenuation, it is disconnected. Press the Audio Mute

button again to un-mute the output and return to the previous output level.

Control of audio output 2 is available through RS-232 or Ethernet/Telnet only.

Audio outputs

Balanced or unbalanced audio output is available on the MPX 423 A using a

3.5 mm, 5-pole captive screw connector. Refer to the following illustration for

proper wiring.

Unbalanced Output

Tip

See caution

Sleeve

Tip

See caution

Balanced Output

Tip

Ring

Sleeve (s)

Tip

Ring

Figure 2-5 — 3.5 mm, 5-pole captive screw audio connectors

CAUTION

Connect the sleeve to ground (Gnd). Connecting the sleeve to a negative

(-) terminal damages the audio output circuits.

Resetting the Unit

There are four reset modes activated by the Reset button in the back of the unit.

The Reset button is recessed, so use of a pointed stylus, ballpoint pen, or Extron

Tweeker is suggested.

The I/O button on the front panel also has limited reset capabilities, described on

the following page.

Hardware reset modes

CAUTION

The reset modes listed below close all open IP and Telnet connections, and

all sockets.

If the Reset button is continuously held down, the rear panel LED pulses

(blinks) every 3 seconds and puts the unit in a different mode (corresponding

to the underscored notes in Modes 3 through 5). The third blink indicates the

last mode, Mode 5, so the LED blinks three times. The following modes are

listed as separate functions, not as a continuation from Mode 1 to Mode 5.

Mode 1: Holding the Reset button while applying power defaults the unit back to

the base firmware that shipped with the unit from the factory. Event scripting

does not start when the unit is powered on in this mode. This allows you to

recover a unit that has incorrect code or updated firmware running. All user

files and settings are maintained. User Web pages may not work correctly if

the unit is using an earlier firmware version.

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