Grass Valley XtenDD v.4.2.4 - Manual (Page 359)

3. Menu Operation
3 – 212 Operating Instructions – Rev. 1 / 7.2002
Index card for installation the panel GPIs.
Select Modify to determine wheater the rising or falling edge of the arriving signal
(GPI 1 ... 6) is to be used.
A GPI is considered Active when current flows through the LED of the opto-coupler
at the GPI input. When no current flows the GPI is Inactive. Hence a Rising edge
is the transition from Inactive to Active, and a Falling edge is the transition from
Active to Inactive.
GPI