Grass Valley 8972PX User Manual

Page 12

8972PX — Instruction Manual

Configuration Summary

An understanding of the switching override priorities can be helpful in
using the 8972PX module. As shown in

highest priority over other manual switching controls and the autonomous
control modes.

Activating the GPI interface by making contact closure with the Switch to
Primary, Switch to Secondary, or Switch to Alternate GPI lines will force the
Program Output to the selected choice. When this GPI line is de-activated,
the module is left in Manual mode and the Program Output can be
switched using any of the manual switching controls or the module can be
set to Autonomous mode using the Output Control web page, the Newton
Control Panel, or the SNMP get/set controls.

Note

When the GPI Exclusive Control is activated by contact closure, only the GPI
switch controls (Switch to Primary, Switch to Secondary, or Switch to Alter-
nate) can be used to change the input choice to the Program Output, leaving
the module in Manual mode. Once all GPI closures are de-activated, the
module can be controlled using any manual switch controls or be configured
for autonomous control.

Figure 1. Switching Control Priorities

Release all four
GPI lines

Web, Newton Panel,
SNMP autonomous
mode controls

Web, Newton Panel,
SNMP, pushbutton
switch commands

Activate any
GPI line

8580_10r0

Manual mode (GPI Only)

Manual mode

Autonomous mode