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D-5000 / May 2000
CPU & DSP MODULES
entering the D-5000 console are usually normalized in the recording or
transmitting process for peak signals such that the absolute maximum peak
signal is very close to, but does not exceed, the maximum or highest digital
word in the AES bit stream. This implies that any decrease in signal caused
by placing the console fader at a “normal” setting somewhat less than full
up needs to be made up at the output of the console or the signal will be lower
than it was at the source. Radio consoles are normally operated with their
faders at less than full up to allow for some control over level and mixing (
if a signal is too low or quiet, the fader can be moved up until the signal
matches the normal levels as shown in the console meters.). By using the DIP
switches, the user can configure what the normal fader setting (and hence the
output make-up gain) should be. Consult the “Global Gain” table in the
“Internal Programming Options” section, page 8-8, for the gain values. The
D-5000 console is normally shipped with a make-up gain setting of +12dB
for a nominal fader setting of -12dB from the top. The gain value briefly
shows in the CPU-600 display window during the console power up process
( “12--00dB” indicates +12dB gain). Note that setting the make-up gain too
high for the signals and fader settings used can result in a clipped or distorted
signal, just as it could with an analog console.
4. The fourth function is the CPU display window. The eight characters
displayed in this window are used to communicate general information to
the user. During the power up process, the CPU tests each module for proper
communications; any errors found will be displayed in the CPU display
window. Once the module communications have been tested, the CPU
briefly shows the selected make-up gain (see above), and then alternately
displays “LOCAL <>” and “LOCAL><“ to indicate normal operation. If
the CPU detects an error during normal operations, it will show the error
message in the display window. If you see such a message, make a note of
it and contact Wheatstone Technical Support for instructions. Note that the
normal display is changed to “REMOTE <>” and “REMOTE ><“ when the
console serial interface has been de-activated by pressing the large button on
the CPU-600 module.
5. The fifth function is serial interface control. The front panel of the
CPU-600 module has a large pushbutton switch. Activating this switch will
enable the remote serial interface to the console, and de-activating the switch
will disable the remote serial interface. When the interface is activated, any
device connected to the interface can control any of the console functions.
Note that the console operator also has control of the console functions even
when the remote serial interface is enabled.; the console will respond to any
command regardless of where it comes from. When the interface is disabled,
the console will not respond to any commands sent to the remote serial
interface; it will respond only to the console switches and faders.
D-5000 / Dec 2000
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