Grass Valley VM 3000 System Controllers v.7.4 - Manual (Page 665)

E−1 VM 3000 Installation and Operating Manual
Appendix E
Mark/Search Commands in Jupiter Control System
This appendix is to clarify the operation and implementation of these two commands when used with the MC 3000 control
panel and in the TCS 1 translators.
MC 3000 CONTROL PANEL OPERATION
The operation of the MC 3000 control panel is generalized to support time code and non−time code oriented machines. This
insures that the operator interface is consistent. Descriptions are included for operation with time code and without.
MARK command push button
If the operator presses the MARK push button, the following operations are performed by the MC 3000 control panel driver:
1) The current time code value is captured by the MC 3000 driver. This value is stored locally and is used for the
Search command. If the machine being controlled does not provide a time code value; i.e., TCS 1 machine inter-
face, an invalid time value is stored.
2) A ES−bus PRESET <time value> command is sent to the machine being controlled. In the case of a serial con-
trolled machine; i.e., ES−bus, Sony, Ampex, etc. this time value may be used for future search commands. If the
command is sent to a non−serial machine, i.e., GPI or TCS 1 control, the command results in the TCS 1 bit com-
mand or GPI corresponding to the machine CUE/MARK push button is sent. Time code values are meaningless.
SEARCH command push button
If the operator presses the SEARCH push button, the following operations are performed by the MC 3000 control panel
driver:
1) The current machine PREROLL time value is subtracted from the previously stored MARK time value. The
preroll time value is found by interrogating the controlled machine and recovering the defined preroll time
value. If the time values are invalid; i.e., GPI or TCS 1 control, an invalid time value is generated.
2) An ES−bus TARGET SEARCH <time value> command is sent to the machine being controlled. In the case of
a serial controlled machine; i.e., ES−bus, Sony, Ampex, etc., the machine is placed in search mode and is moved
to the time value included in the TARGET SEARCH command. Since the time value sent to the machine incor-
porates the preroll time value, the machine will be moved to the PREROLL location. If the command is sent to a
non−serial controlled machine; i.e., GPI or TCS−1, the time value is ignored and a command corresponding to
the SEARCH/CUE push button is sent to the machine. The actual result of this command is determined by the
operations of the controlled machine. In most cases, the machine will cue to the previously marked location, this
is usually less the PREROLL value.