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6
DAS 8.4 Plus Installation and Operation Manual
DESCRIPTION
AES/EBU Digital, Analog Audio and Activity Sensor.
The DAS 8.4 Plus contains an 8 - 96kHz AES receiver and 24-bit D/A convert-
er. The AES receiver may monitor any one of the four AES outputs with the front
panel monitor selector switch. The AES receiver provides data integrity information
to the microcontroller, which is used to indicate a data error. The D/A converter fur-
nishes a stereo feed to the balanced analog audio output amplifier, headphone ampli-
fier and level control, along with the stereo 10-LED meter and silence sensor cir-
cuitry. The factory default time delay and restore delay is set at 10 seconds, with a
fixed signal threshold of -30dB. Upon silence detection for the user-selected time,
the serial “SS/DIG Error” status is sent. When audio returns and the restore time
delay has expired, the serial “SS/DIG Error” status is sent. The “SS/DIG Error” may
be programmed for:
• Number of seconds of silence that must be present before an alarm state is
reached.
• Number of seconds of audio presence after an alarm state before the
“SS/AES/EBU “DIG Error” led illuminates.
PIP Input:
The Parallel Input Port (GPI) provides 16 pulse-stretched parallel 5-volt
TTL/CMOS compatible inputs. The inputs are pulled high to 5 volts through a
20K
Ω
resistor and are activated by pulling the input to ground for a minimum of
40ms. These inputs supply status to any serial polling device (when the unit ID is
set to 0, no polling of inputs is required). For all PIP inputs a pulse of specified min-
imum input duration (000 to 2.55 Seconds) causes the status to go true until the end
of the input pulse. The pulse width may vary between the specified value and 10 ms
less than that value. This allows the polling computer more time to detect an input
change.
“Open Collector” Status Outputs, 16 Port Output Control
The DAS 8.4 Plus provides sixteen open collector status outputs. The status out-
puts may be configured to operate in one of three modes:
• The status outputs follow the first eight-associated channel.
• The status outputs a one-second pulse when the first eight-associated channel is
selected.
• RS-232 serial burst mode control
