Miranda Imagestore HDTV, User Manual, Page: 54 / 102

Front Panel Operation Imagestore HDTV User Manual
Page 54 Miranda Technologies Ltd
GPI In 9 Off
Set
Show
Clear
General Purpose Interface (GPI) ports may be used either to trigger the
execution of a series of Imagestore HDTV internal pre-programmed
commands (input) or to monitor the status of the Imagestore HDTV (output).
The nine GPI ports are identified as GPI 1 through GPI 9. The first seven
ports, GPI 1 through 7, may be configured as either input or output ports
whilst the remaining two, GPI 8 and GPI 9 may only be configured as inputs.
Any GPI, assigned to ‘input’, may have a macro associated with it that
contains up to 2K bytes of command data (approx. 200 commands strings).
When triggered, the commands within the macro execute sequentially. If the
GPI is assigned as an ‘output’, it may only have a single status associated
with it.
Input to GPI
Where a GPI port is used as an input, the command macro is activated when
either, the connection is made (GPI On) or switched off (GPI Off) relative to
the GPI ground pin (pin 13) on the GPI 25way D type connector.
To start a macro associated with GPI In 1 On, make connection between pins
25 (GPI0) and 13 (GPI GND)
To start a macro associated with GPI In 1 Off, break connection between pins
25 (GPI0) and 13 (GPI GND)
For connector information refer to the diagram on page 74.
Create a Macro
To create a macro, display the relevant GPI then press the enter key. The
next sub-menu offers three choices, Set, Show or Clear . To create a new
macro, select Set.