Grass Valley 8972PX - Manual (Page 14)

14 8972PX — Instruction Manual
Configuration Summary
When the GPI Exclusive Control line is activated by contact closure, only
the Switch to Primary, Switch to Secondary, or Switch to Alternate GPI
control lines can be used to change the designated input selection (by
contact closure). The Program Output selection will be under control of the
GPI Switch commands until the GPI Exclusive Control is de-activated
leaving the module in Manual mode. At this point, the user may use
another manual switching control to change the input to the Program
Output or set the module to an Autonomous switching strategy.
It is not necessary to activate the GPI Exclusive Control to drive the module
with a GPI control. Any one of the three GPI controls (Switch to Primary,
Switch to Secondary, or Switch to Alternate) can be activated indepen-
dently by contact closure forcing the Program Output to the designated
input. This also switches the module to Manual mode. The selection of the
Program Output will remain under GPI control only as long as one of these
three GPI controls is activated (by a contact closure).
While the Program Output selection is under GPI control, the web pages
will display a message stating
The GPI is controlling the Program Output Selection
(see Figure 27 on page 64 ). Once GPI control is removed (no contact closure
on any of the four GPI controls), the module is in Manual mode. The user
can then control the module with any of the manual switching controls (see
Manual Switching Controls on page 13 ) or set the module to an Autonomous
switch mode (Maintain Primary or Maintain Stability).
Web Page Control
The Program Output can be forced manually using the Output Control web
page (
page 62 ) by selecting the Force Primary , Force Secondary , or Force Alternate
buttons in the Program Output Selection section,. This will change the
Switching Strategy Switch mode to the
Manual radio button on this web
page.
Newton Control Panel
The Newton Control Panel command PrgOutput allows manual selection of
the Primary, Secondary, or Alternate output and forces the Program output
to this selection. For a summary of all Newton Control Panel parameters,
refer to the Summary of 8972PX Configuration Functions
on page 83 .
SNMP Commands
In addition to the standard 8900 module SNMP monitoring reporting, the
8972PX module allows two get/set commands to manually manage the
input selection (Input Select) and module mode of operation (Switchback
Strategy) through the SNMP interface. Refer to
Using Additional SNMP
Commands on page 80 for details.