Redbox User Handbook No 1
107
SY
NCHR
ONISERS, DEL
A
Y
S & SILENCE DE
TEC
TORS - RB
-SD1
9
Alarm Indicator
The Alarm indicator situated on the front panel is used to display the alarm status of the
Main input. Its operation is dependant on the selected mode. When in stereo mode the
unit alarms on a single main channel timeout, and in mono, alarms on both main channels
timing out. The unit exits the alarm state on the return of the main source signal, depending
on the setting of the Stereo/Mono Dipswitch. The alarm indicator is remotely indicated on
pins 1 and 2 of the remotes connector.
Restore Button
The restore button is used for restoring the main source signal when the unit is operating
in Manual Mode. When the main source signal returns after it has timed out, the Mode
LED flashes, indicating that the source signal can be restored. When the Restore button is
pressed the main source returns. This can be remotely controlled using pin 7 of the
remotes connector.
Additional Modes
An option to set the unit in different modes of operation is available and is selectable when
the unit is powered on. The current available modes of operation are as follows:
Normal Mode
is as described previously for normal machine power-up.
Remote Stop Mode
operates as follows. When the main source returns from an alarmed
state, pin 4 on the remote connector (Aux Alarm) closes to Pin 11 (Aux Alarm Common) for
half a second. (Note: this will only occur when the Remote Start Mode Switch is set on (page
104
) and whilst in Remote Stop Mode
the Aux alarm is not available to indicate the presence
of audio on the auxiliary input).
Remote Alarm Set Mode
operates as follows. When the RESTORE pin on the remote
connector (pin 7) closes to the DIGITAL GROUND pin on the remote connector (pin 8) the
unit will immediately enter an alarmed state and switch to the auxiliary input. This alarm
state is continued until the RESTORE pin opens to the DIGITAL GROUND pin. After this the
unit will switch back to the main input when audio is present.
NOTE: When operating in manual mode, restoration of output from the main input is
only available via the front panel restore switch. All other functions operate as normal.
Signal Detection Mode
In this mode the three controls, source, remote source, mode,
remote mode, restore and remote restore have no effect.
The count in time for the signal detection is zero, i.e. as soon as signal is detected on an
input the relevant relay will switch. The relays operate the same as in normal mode, i.e. when
audio is detected on the main input, pin 1 on the remote connector closes to pin 9. When
audio is lost on the main input, pin 2 on the remote connector closes to pin 9. All other
functions operate as with normal mode.
Timeout x 2 Mode
. In this mode, the timeout selection is multiplied by two (see table
on the following page), except for the max time selection (position F on the time rotary
encoder). All other functions operate as normal.
SYNCHRONISERS, DELAYS &
SILENCE DETECTORS
