Instruction manual

Version: 100505 VTC-4000 INSTRUCTION MANUAL Page 14 of 27
GPO SETTINGS
GPI EDIT ENABLE
Enables/disables the GPI backspace edit feature per VTR (default is disabled). If enabled and the VTR is set
for HARD RECORD, when the VTR's GPI input goes active (low) a record command is sent to the VTR, when
the GPI goes inactive a Stop command is sent. If enabled and the VTR is set for OPEN ENDED INSERT or
OPEN ENDED ASSEMBLE edit mode, when the VTR's GPI goes active the VTR is sent an auto edit sequence
which performs a two second preroll open ended auto edit from its currently parked position. When the GPI
goes inactive the edit is stopped and the VTR is cued back two seconds to prepare for the next edit, which will
begin when the GPI again goes active. If enabled and none of these record modes are set the GPI is ignored;
the normal GPI Play command is inhibited (see GENERAL PURPOSE INPUTS (GPI)).
SET PREROLL
Defines the preroll time used for editing, all synching operations and for the cue with preroll command.
SET AUTO TAG
Enables/disables the auto tag feature (disabled is the default). If enabled, when an edit is completed, the VTC-
4000 automatically increments the current event and copies the completed edit’s OUT point into the new event’s
IN point. This simplifies the process of sequential editing.
COLOR FRAME MODE
Enables/disables the automatic color frame feature. When enabled (the default), any time a VTR is put into
Play mode, a 4 field lock command (8 field for PAL) is sent prior to the Play command. This results in color
framed playback. When a VTR reports locked servos and the color framer is on, the system records the
relationship between timecode and video reference. This relationship is used whenever a synched playback
mode is selected (such as an edit) to start the timeline. A two field lock command (color framer off) is sent prior
to any synching process so the VTR’s color framer does not fight the synching process. Synching is performed
using the same timecode-reference relationship that was established during the last color framed playback.
This results in color framed edits, but only for the VTR that is selected as the master when the edit is begun. In
multiple record edits, it is important that the tapes used all have the same timecode to color frame reference
relationship (color frame A or color frame B, but all the same), and that all the IN points have either odd or even
frames. Recording with identical timecode on all record machines will guarantee this. In the 24FPS standard,
color framing is disabled (set to 2 field).
Note that in PAL there is a 4 frame sequence, and since there are an odd number of frames in a second, the
record machines must either have the same timecode, or the remainder of (seconds times 25 plus frames)
divided by 4 must be the same.
EDIT RETRY
Allows the default NOSYNC: 3 RETRYS to be changed. Normally, when an attempted edit or synch roll fails to
synch during the preroll time, the system re-cues and retries synching three times before aborting. ABORT ON
NOSYNC inhibits retries, and all VTRs are stopped. NOSYNC: REC ANYWAY causes the system to ignore the
failure to synch and to record or continue to roll anyway. The latter would be used in a live environment where
any recording, even an out of synch one, is preferable to an abort or retry.
1 MONITOR EDIT
Enables/disables record VTR EE switching. This feature is useful when only one monitor is available. When
monitoring the output of the record VTR, switching to other VTRs places the record VTR into EE so the signal
being input (presumably from the playback VTR) is passed on to the output.
GPO SETTINGS
Sets enable/disable/cycle test modes and sets the timing for the four general purpose outputs available on the
RM-4000 GPI connector (see GENERAL PURPOSE OUTPUTS (GPO)). Use the RIGHT arrow key to shift