Grass Valley Kayak HD Installation Planning Guide v.6.9.2 - Manual (Page 50)

46 Kayak HD — Installation Planning Guide
Section 4 — Options
The function of each GPI input is user assignable. The activation of the
function can be programmed to occur on the leading edge or the trailing
edge of the closure, or both edges. The switch must be closed for at least one
field.
Refer to the Install Menus section of the Kayak HD User Manual for details
on setting the input signal activating edge.
Refer to the Configuration Menu section of the Kayak HD User Manual for
details on setting the function of a GPI input.
GPI / Tally Outputs
There is a great deal of flexibility in the hardware and programmability of
the GPI / Tally outputs.
Outputs are arranged in groups of four. Each group has its own common
connection. These are labeled GPI_OUT_COM_A through
GPI_OUT_COM_H for the first connector (corresponding to GPI /Tally
OUTs 1 - 32). These commons can all be tied together, forming one common
bus for all 32 outputs. Alternatively, multiple smaller commons can be con-
structed to interface with systems that need isolated common connections.
This common or isolated bus scheme can extend across multiple connec-
tors. For example, a 4 M/E system could have all commons of all connec-
tors tied together. All 128 relay closures will connect to one common bus.
Another case may require two isolated common busses - half of the
commons form the first common bus and the other half form the second
common bus.
The example in Figure 29 on page 47 shows two common busses. The first
four outputs (COMMON A) have the common bus tied to ground. This
drives a logic system. The last outputs (COMMON G & COMMON H)
have the common bus tied to +12 volts. This drives a tally lamp system.