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2.13. CONNECTING AN EXTERNAL COMPUTER - DATA LOGGING
INSTALLATION
4025
cannot
properly
compensation value required for KeyKode calculations.
introduce a possible error of ±1 film frame in the edge number encoding
when used with KK JAM set to PLAY or WINDOW. One of the following
methods may be used to overcome this problem:
1. Use a higher bi-phase tach rate. (10 cycles per film frame)
2. Turn Scantrack off.
3. Use the KK JAM ONCE mode. This works because the
Rank telecine's Scantrack offset is zero when it is first put
into play. (See section3.4.1)
4. Enable the Play-window function of the 4025 by:
a. Adjust the PLAY WINDOW parameter in the Toolbox
menu (SHIFT + FORMAT) to a value of 1 FRAME.
b. Set the KK JAM mode to PLAY or ALWAYS.
When the Play-window function is On, a KeyKode jam will occur
when the error between the KeyKode number and the bi-phase
based number is greater than 1 film frame.
number that the 4025 jams to when the telecine is first put into
Play is correct because the Rank's Scantrack offset is zero
when started. During the transfer, it is normal for the KeyKode
status ERR display to show ±1. (See section Error! Bookmark
not defined. for information about the KeyKode status display)
This is due to the ambiguity in the instantaneous Scantrack
value calculated. With the PLAY WINDOW VALUE = 00, the
4025 will re-jam when this condition exists.
WINDOW VALUE = 1, the 4025 will ignore this apparent error
and continue using the bi-phase based numbers, which will be
correct if no splices have occurred.
If a splice is encountered, during the transfer, the 4025 will re-
jam to the KeyKode numbers with the possibility of a ±1 frame
error. To eliminate this error, the telecine must be stopped and
restarted. This will zero the effect of Scantrack, and will allow
the 4025 to jam unambiguously to the KeyKode numbers.
2.13.1. Data Logging Output
A nine pin sub-miniature 'D' connector (SERIAL I/O) is provided on the I/O
module
for
remote
timecode / keykode relationships during telecine transfer. This serial port
provides both RS-232-C and RS-422 levels (Jumper changes on the 7006
I/O Board inside the 4025 are required to enable the RS-422 mode). See
Chapter 7 for the pinout of the connector. The transmit side of this serial
port generates a binary FLEX format data output that documents the
timecode, KeyKode and pulldown relationship of the film transfer to an
Model 4025 Film Footage Encoder Manual
determine
the
connection
to
a
computer
instantaneous
Scantrack
This may
The KeyKode
With the PLAY
for
logging
Page 2-35
the
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