Miranda Imagestore HDTV, User Manual, Page: 61 / 102

Imagestore HDTV User Manual Front Panel Operation
Miranda Technologies Ltd Page 61
Output from GPI
A GPI port may used as an output to trigger external devices and its active
status, (on), is defined by the output being internally pulled to ground by a
"Darlington" configured transistor such that an active low will be represented
by +0.7V. Lamps or relays attached to an output GPI may use the GPI +12V
supply (pin 8) but the maximum current drawn from this supply should not
exceed 500mA.Where a GPI output is used to drive a relay coil, reverse
voltage protection diodes should be incorporated into the circuitry to protect
the Imagestore HDTV from voltage transients.
Only GPI 1 to GPI 7 may be assigned as a GPI Output but each GPI may
have a condition assigned whether it is set on or off, i.e. GPI Out x On or GPI
Out x Off .
Create an output
To create a GPI output, display the relevant GPI then press the enter key. The
next sub-menu offers three choices, Set, Show or Clear . To create a new
output, select Set.
Set
The Set menu offers a range of options that when executed by the Imagestore
HDTV will trigger the GPI Output. Using the arrow keys
W X
display the
command to be added to the GPI Output and press enter to add it. Only a
single function may be added to a GPI Output.
The options are:
Mixer at A
Mixer at B
L0 FTB Off
L0 FTB On
L1 FTB Off
L1 FTB On
L0 Fader Off
L0 Fader On
L1 Fader Off
L1 Fader On
L0 FTB Disabled
L0 FTB Enabled