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ARRI ALEXA Mini - GPIO Box Connection and Functionality

ARRI ALEXA Mini
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140 MENU > User buttons
Auto WB: First press arms Auto white balance for 1 second, second press
while AWB is armed triggers AWB.
Button 'FN': Behaves identical to FN button on camera body.
Note: Only available for GPIO box user buttons.
Button '1': Behaves identical to button 1 on camera body.
Note: Only available for GPIO box user buttons.
Button '2': Behaves identical to button 2 on camera body.
Note: Only available for GPIO box user buttons.
Button '3': Behaves identical to button 3 on camera body.
Note: Only available for GPIO box user buttons.
Check last clip: Plays the last five seconds of the last recorded clip.
Color bar: Turns color bar on or off. Activation works only during Stby.
EF Auto Iris: Triggers automatic iris compensation***.
EF Open Iris: Opens the iris of a lens. Short press opens by 1/x stop (step size
depending on lens), long press opens by 1 stop per 0.5 seconds***.
EF Close iris: Closes the iris of a lens. Short press closes by 1/x stop (step size
depending on lens), long press closes by 1 stop per 0.5 seconds***.
EI Decrease: Decreases camera Exposure Index by 1 value.
EI Increase: Increases camera Exposure Index by 1 value.
Framegrab: Grabs a still frame from the image stream to the USB stick (during
Standby only).
Note: Framegrab inherits SDI image settings.
Frame line color: Changes the frame line color.
ND Decrease: Decreases the active ND filter by 1 step.
ND Increase: Increases the active ND filter by 1 step.
Overlay menu: Activates and deactivates the overlay menu on MVF-1 EVF
image and monitor image as well as SDI image (when SDI processing is
activated).
Prerecording: Switches pre-recording on or off.
Record Start/Stop: Behaves identical to record button.
Stop motion trigger: Triggers the capture of a single frame during recording in
recording mode Stop Motion.
* Affects both viewfinder and monitor settings.
*** Requires both an EF lens mount and a suitable EF lens.
User button smart behavior: For these user button functions, a short press toggles the
function, while a longpress activates the function only temporarily.
Example: Press EVF zoom long > EVF zoom function is activated, release of button
deactivates zoom. Press EVF zoom short > EVF zoom is activated. Press again to
deactivate.
GPIO box
The ARRI GPIO box (GPB-1, K.2.0007642) can be used as an interface to the camera
for external user buttons. It connects to the camera via the EXT connector and has
a 37-pin D-Sub connector carrying 14 GPI (General purpose input) connections plus
2 outputs (camera power status and camera recording status). Currently, the GPIO
box is hard-mapped to channel 0. For additional information, please refer to the user
manual of the GPB-1.

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