If Format 10 is detected on one of the format selectors, the DA20 will automatically assert that
format whenever the following conditions are met:
• The DA20 detects that the CP200 is operating in a film format (Format 01, 04, or 05) as
indicated by the state of the Format Bus line.
• The DA20 is decoding valid digital film data.
If the above conditions exist, then the DA20 will automatically assert Format 10 thus eliminating
the need to separately cue digital films or trailers. The DA20 will continue to assert Format 10
commands after any film format assertion in order to keep the CP200 in Format 10 as long as valid
digital data is available.
After the DA20 has asserted Format 10, if valid digital data is no longer available, then the DA20
will revert to analog. Though the CP200 will remain in Format 10, the yellow ‘Analog” LED will
light and the audio signal path will switch to the analog SR track. At this point, an automation
system or operator can assert any format. The DA20 will not re-assert Format 10 until valid digital
data is again available.
To disable the automatic selection of Format 10 by the DA20, two methods are provided:
First, the CP Type switch can be set to position 7. This disables the ability of the DA20 to
assert any format commands except those associated with analog reversions when in Format
10.
Second, the ‘GO’ button on the CP200 can be pressed and held for at least 5 seconds. After 5
seconds has elapsed, the green ‘Digital” LED on the DA20 will go off and the ‘Analog’ LED
will flash. At this point, the CP200 will be playing the analog SR track and any format can be
selected without the DA20 forcing the CP200 back into Format 10. If Format 10 is again
selected, then the DA20 will remain in analog reversion mode thus forcing the CP200 to play
the analog SR track. Auto-digital mode can not be re-enabled unless the DA20 is turned off
and then on again, or the CP Type switch is rotated out of and back into position 3. This will
cause the DA20 to re-scan the CP200 format selectors and look for Format 10 again and
therefore should not be performed while film is playing.
Power Failure
If for any reason the DA20 loses power or resets while in format 10, then the CP200 will default to
format 05. Relays within the DA20 will de-energize and analog sound will bypass the DA20. This
will occur regardless of the position of the Cinema Processor type switch.
CP200 to DA20 Sense/Control
The DA20 monitors the CP200 Future 8 and Future 11 control lines to determine which format is
selected on the CP200. A low level on Future 8 indicates that format 10 is selected. A low level on
Future 11 indicates that an optical film format is selected. Future 11 is used to cause the DA20 to
assert format 10 automatically when the DA20 is in Auto Digital Mode and valid digital audio is
present. See the DA20 Users' manual, issue 4 and above, for specific information on the operation
of the Auto Digital feature.
(2 pages)
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