Gpi inputs and macros – Grass Valley Imagestore 750 v.3.0.1 User Manual
Page 64
48
Features
General Purpose Interface (GPI)
Where a GPI output is used to drive a relay coil, you should incorporate reverse voltage
protection diodes in the external circuit to protect the Imagestore 750 from voltage transients.
See
on page 207 for details of the GPI connector pinouts.
The GPI ports can be used as inputs to execute a series of internal pre-programmed commands,
or GPI ON/OFF macros. The GPI ports can also be triggered either on or off by a pre-defined tran-
sition state defined for the Imagestore 750. See
on page 48 and
on page 50 for a description of how GPI inputs and outputs are configured.
Because GPI ports are shared between inputs and outputs (bi-directional), it is a common
practice to reserve some GPI ports solely as inputs and others solely as outputs. However,
GPI input macros can be configured to be driven from GPI output events on the same port if
this is required. An example might be to cut up a voice-over automatically through a macro
(input) when a DSK starts fading up (output).
GPI macros, described in the following section, are directly associated with the GPI connections
and limited to a maximum of 32 macros (fewer when GPI outputs are defined).
Note that GPI macros are difficult to compose and are limited to actions that can be selected
from the front panel’s ‘Operate’ menu.
You can find a more versatile, extensible, and friendly way of creating macros in the Images-
tore 750 Configurator under ‘Macro Mode’. Up to 65,536 macros can be created, each of
which can be named to help the iMC control panel meaningfully represent macros to a
panel operator.
Macros consist of a list of Oxtel automation commands, with delays being inserted using the
‘Xd’ automation command. See
on page 50 for details. For complete details of the
Oxtel automation protocol, see the automation publications listed under Applicable Publi-
cations and Tools on page 3.
GPI Inputs and Macros
Any GPI input can have two associated macros:
•
One macro associated with the GPI port transitioning on.
•
One macro associated with the GPI port transitioning off.
Each macro can contain up to 2048 bytes of Oxtel command data. (That is approximately 200
commands.) When the GPI is triggered, the commands within the macro are executed sequen-
tially. Pauses may be defined within the macro if they are required. The macro associated with a
GPI input can also be set to trigger a macro that was defined in the Imagestore 750 Configurator.
See
on page 50 for more details.
To create a GPI macro from the Imagestore 750’s front panel:
•
Select the appropriate GPI input event.
•
Select Setup > GPI > GPI Inputs. Then choose GPI In x On or GPI In x Off.
Here “x” represents the GPI number, from 0 to 15.
•
ON macros are triggered when the appropriate GPI input is triggered on.
•
OFF macros are triggered when the appropriate GPI input is triggered off.
•
Press the joystick down [enter] to enter the macro editor.
•
If the GPI is unused, the display shows ‘
>
Empty
<
‘.