GPI-100 User Manual (Iss. 06)
Configuration • 4–3
Configuring GPIOs
The GPI-100 has eight GPIOs connections on the rear module. You can monitor the status of each
of the inputs/outputs as either Low or High using the fields in the GPIO Status tab. This section
outlines how to configure a GPIO to be active and if required, reverse its polarity.
Configuring the GPIO Mask
The
GPIO Mask
tab controls which of the eight GPIOs are active. The GPI-100 will only
generate triggers for enabled GPIOs in encode mode and will ignore changes in the GPIO state of
unchecked GPIOs. While decoding triggers from the VANC, the GPI-100 will only drive GPIOs
that are enabled. It is therefore possible to have the encode card generate triggers that the decode
card will not react to. For example, an encode card could generate GPIO1 and GPIO2 at different
times. A decode card could be set to respond to GPIO1 while another card responds to GPIO2.
To configure a GPIO to be active
1.
Select the
GPIO Mask
tab.
GPIO Mask Tab
2.
From the provided list, select the box(es) for the GPIOs you wish to enable.
3.
Click
Save
to apply the changes.
GPIO Polarity
By default, connecting a GPIO input on the encoding GPI-100 to ground (i.e. a Closed switch)
causes a Low logic level. A decoding GPI-100 will faithfully reflect this Low logic level on the
corresponding GPIO output. An Open input on the encoder is a High logic level, which will
produce a High at the output of a decoding GPI-100. In summary, the GPIO output state of the
decoder is identical to the GPIO input state of the encoder.
The
GPIO Polarity
tab enables you to reverse the polarity of the specified GPIO.