Grass Valley XtenDD v.4.2.4 - Manual (Page 360)

3. Menu Operation
3 – 213 Operating Instructions – Rev. 1 / 7.2002
Index card for installation the panel GPOs.
Select Modify to change the parameters:
Shape: Pulse / Static
Idle State: Open / Closed
Pulse Duration: Enter the preroll time in frames
(max 255 frames)
Attached to: Assign a fixed video source to the GPI channel
Note:
Panel GPO6 is reserved for the ALARM function.
GPO