Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 434)

MAESTRO User Manual 430
Appendix
C
Insertion of Keys and Audio
Overs via GPI
Any of the eight keyers and four audio over mixers can be triggered by an
external GPO (GPI in Maestro) signal. The GPI sub-system in Maestro that
enables this functionality is called the EAS (Emergency Alert System) sub-
system; however, any application in which external triggering of keyers
and audio over mixers is required may use the EAS subsytem as described
in this appendix.
For information on wiring the GPIO connector, see 44-pin Control Connec-
tors in the Planning section of the Installation and Service manual.
Emergency Alert System Switching
In USA installations, the GPIO connector on the Maestro rear panel can be
connected to an Emergency Alert System (EAS) receiver and configured to
switch the EAS video and audio automatically to the Program output when
a trigger signal is received. See
Figure 1 on page 431 .