Initial Power Application
Once power is applied and a valid AES bit stream is applied to the selected input, the unit will
default to “MAN” mode of operation. The LED indicator over the “MAN” button should be
illuminated. In addition, the channel selected LED indicator will be lit or flashing which indicates
audio level under threshold for at least 5 seconds. This feature allows the user to determine if
audio level is sufficient to drive the unit or for troubleshooting purposes. This feature can be
defeated if desired by setting DIP SW1-6 to the OFF position. In the OFF position the unit will
always indicate channel selection with a steady lighted indication. There should also be an
indication of sample frequency. The AES-402 supports any sample rate between 32 and 192
KHz. Standard sample rates are indicated on the front panel under “Sample Rate” and non
standard sample rates are indicated with the “OTHER” LED indication being illuminated. Press
the error-reset button to clear any errors that might be indicated. If the digital audio stream
feeding the active channel of the unit is valid and no errors occur the unit is ready for to be placed
in the automatic mode if desired. If any of these errors occur after depressing the error-reset
button, then the feed to the unit is defective and should be investigated. If all is in order, the unit is
now ready for operation. All that is left to do is to select the desired feed and then if desired, place
the unit in automatic switch mode by depressing the “AUTO” mode button. The LED indicator will
light indicating automatic control of the switcher. The unit will remain in this mode until an error is
detected, loss of lock occurs, silence or is detected. If any of these events occur, the unit will
switch to the alternate path and remain there until the error reset is performed from the front
panel or remotely. When in AUTO mode and an error occurs the unit will go to manual mode and
the “MAN” button and error indication will flash to indicate that an error has occurred. To clear
the error, depress the “ERROR” button. If the error clears the “ERROR” button LED will
extinguish, error indicators will extinguish and the “MAN” button will remain illuminated until the
“AUTO” button is depressed.
Description of AES-402 Optional Programming Functions
S1-1 Front Panel Button Defeat
– When set to on will cause the A/B, MAN and AUTO buttons to
be non operational. Rear panel GPIO and serial remote control are still available when this switch
is turned on.
S1 -2, 3 Time Delay
– Sets the time delay that the silence sensor will wait before switching. Time
delay can be set to 30, 60, 90 or 120 seconds.
S1-4, 5 Silence Detector Channel
– Can be set to monitor both (L+R) or left only/right only.
When set to both, the silence detector will switch to the alternate path if one or both channels
signal level fall below threshold for the time delay set. For Left or Right only the silence sensor
will only switch after the channel being monitored times out. The unselected channel is ignored.
S1-6 Silence Indication on A/B Buttons
– Will cause the selected channel button to flash if
audio level falls below threshold for more than 15 seconds. Set to off for steady on condition of
A/B buttons.
S1-8 Serial Remote Control
– Turns on serial remote control functionality.
S2-1 AES ERROR Switching delay
– when enabled ignores all momentary digital errors under 5
seconds in duration – eliminates inadvertent switching on transient events. When switched to off
position switcher switches channels immediately upon detection of any digital error flags enabled
by S2-2, 3, 5
S2-2 Unlock Error
- When set to on will cause the switcher to switch as per S2-1 setting for an
unlock condition.
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