106
Redbox User Handbook No 1
SYNCHRONISERS, DELAYS &
SILENCE DETECTORS
SY
NCHR
ONISERS, DEL
A
Y
S & SILENCE DE
TEC
TORS - RB
-SD1
9
Source Select and Indicator
The normal Main input source is selectable via a push switch accessed via a hole located on
the front panel, or it can be controlled remotely (pins 13 and 14). This allows you to define
whether input A, or input B is going to be your Main audio input. There is an LED to indicate
which state the source select is set:
LED
Description
LED On
Main source is input A, Aux source is input B
LED Off
Main source is input B, Aux source is input A
Note :
If the unit is powered off, for example during a black-out, input A routes through
to the output. Therefore if the unit is subject to a power fail while the main source is set
to input B, the unit will output source A.
Mode Selector and Indicator
The Mode Switch defines how the unit should operate during an alarm condition, when
the main audio source returns. There is an option to allow the device to switch back
Automatically or Manually. The mode is selected by a push switch accessed through a hole
on the front panel with a corresponding LED to represent its state, or it can be controlled
remotely (pins 5 and 6).
LED
Description
LED On
Automatic Mode – During an alarm condition when the main source
returns, it is switched back automatically, although there must be a
continuous signal present for two seconds before it switches.
LED Off
Manual Mode – When the alarm condition is reached, the LED begins
to flash.
LED Flashing
Manual Mode – The main audio has returned after an alarm condition.
To switch to the main source, push the Restore button (or control it
remotely).
Main and Aux Indicators
On the front panel there are four Main indicators and four Aux indicators. Each left/right
channel has a Program Content and Alarm Status indicator. The Program Content Indicator
represents the input signal level for that channel and the Alarm Status LED indicates when
the channel has dropped below the threshold for longer than the time selected.
Both the Main and Aux inputs are continuously monitored so that you can check that your
backup signal is operating correctly, as well as your main input source.
Note:
Although one channel of the stereo input may have alarmed, the main alarm may
not be set, due to the setting of the Stereo/Mono Dipswitch.
