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Grassvalley AMPprotocol Question

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maurice jansen
Grassvalley AMPprotocol Question
on May 31, 2009 at 11:25:05 am

Sorry for this rather big Quote out of a document
about the GVG-AMPprotocol.
and i'm not sure if this is the right forum?
but do i interpret this ok when i give the DDR
this command that it wil go in play on a specific time.
coming from the internal generator or external LTC.
can i schedule playback with this command nomatter what timecode is
in the clip.
do all AMP compliant servers react the same on the protocol or are there commands that cannot beused on for instance a GVG-Turbo.

i want to trigger a rig of 4Turbo's in a backdrop projection setup
with timecode coming out of a PB-VT


Command Sent
2X.01 Play
Command Type 2
Byte count 0 or 4
Command Code 01
Send Data 1 4 byte time (Timecode Format5.1 (ffssmmhh)) (Optional)
Returns
ACK
Comments
This command places the video disk recorder in the play mode, and playback will
begin. Playback begins from the current timecode position on the currently loaded
ID. The timecode position will increase and new video material will be output
until playback is stopped.
If auto mode is enabled, the Play command will initiate the auto play processing
described under the Auto Mode On command (40.41).
There should be a fixed latency in number of frames from the time this command
is issued, after a Play Cue or In Preset is issued, until the video disk recorder
begins playback. This allows the controlling device to ‘frame accurately’ play
material.
When a Play command is issued, the stop status (status byte 1, bit 5) will be set
low, and the play status (status byte 1, bit 0) and servo lock status (status byte 2,
bit 7) will be set high.
This command can be sent with 0 or 4 bytes of Data. If zero bytes of data are
received, then the Play will begin a frame after the command is received.

If 4 bytes of data are received, then the Play will begin a frame after the time on
the timecode generator on the disk recorder reaches the specified time. The
timecode generator used will depend on the timer mode set. The Event Schedule
Failed status bit (status byte 4, bit 1) will get set if the disk recorder was not able
to schedule the Play. The status bits described earlier will get set when the Play
actually begins. If any other shuttle command is sent after this command, then this
command will be cancelled.
If any Play, Stop or Record command without a timecode is sent after this
command, then the event associated with this command will get cancelled. This
command will also get cancelled if a Rewind or Fast Forward command is sent.
If a timecode is provided with this command, it should be sent at least four frames
prior to the specified timecode.



greet
Maurice


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