Grass Valley VM 3000 System Controllers v.7.4 - Manual (Page 666)

Mark/search Commands
E−2 VM 3000 Installation and Operating Manual
JUPITER CONTROL WITH INVALID TIME VALUES
It is possible to have control panel and serial machine connections which do not provide the time values required for MC 3000
control panel operation. In the case of TCS 1 and GPI control panels, the time values are not available. In order for the MARK
and SEARCH commands to function properly, the Jupiter control system must anticipate operation with invalid (missing)
time values. These functions may take place at the local port translator. In general, the following guidelines need to be fol-
lowed:
1) A MARK command generating a PRESET <invalid time value> causes the current local time of the machine
to be saved. This time is not necessarily presented to the LAN. This is similar to doing a mark on the control
panel of the machine. This stored value will be used for future search commands involving invalid time code
values.
2) A SEARCH command generating a TARGET SEARCH <invalid time value> causing the current device
preroll time value to be subtracted from the previously stored mark time value and the device is then moved to
the new location. NOTE: A search command to a serial control machine with an invalid time value causes a cue
to point with preroll.
TCS 1 AND GPI MACHINE CONTROL INTERFACES
The Jupiter control system is designed to use and transfer time code values. As noted above, the MC−3000 control panel al-
ways uses time values. In the case of TCS 1 and GPI control, no time values are available; invalid time values are created and
used for commands with these devices.
The commands and status used for TCS 1 control is defined by the V25 TCS1 SOFTWARE DESIGN SPECIFICATION,
dated January 16, 1990. This translator does not support time values. TCS 1 control always ignores time values sent or re-
ceived. The selection of the ES−bus commands is designed to provide an active command which may be used to close a relay
type control.
The actual operation of devices controlled by TCS 1 or GPI control, is determined by the device itself. Some commands may
not operate as defined for the corresponding ES−bus command.