Grass Valley Maestro Master Control Installation v.2.4.0 - Manual (Page 70)

70 MAESTRO Installation and Service Manual
Section 2 — Installation Planning
General Purpose Inputs and Outputs (GPIO)
The Maestro GPIO connector presently supports the following applica-
tions:
• Source tally mode (Encore, Prelude, or Jupiter-controlled systems)
• Bus tally mode (Jupiter/MI-3040 systems only)
• Maestro controlled by or controlling an external device, including
another Maestro system, for receiving and sending transition status
signals
• Insertion of Keys and Audio Mix Overs (see Appendix B-Insertion of Keys
and Audio Overs via GPI)
For information on wiring the GPIO connector, see 44-pin Control Connec-
tors
on page 95
Tally
The Maestro identifies which input bus has been selected for the Program
(Air) output, and this information can be used to operate an external tally
light. Two tally modes are available:
• “Source tally” mode (stand-alone tally), and
• “Bus tally” mode (Jupiter/MI-3040 tally).
Source tally mode can be used with Encore, Prelude, or Jupiter-controlled
systems but is limited to 16 GPO closures. Bus tally mode can be used to
operate tally lights for any or all sources controlled by a Jupiter system
equipped with an MI-3040 General Purpose/Tally Interface.
Source Tally Mode (Stand-alone Tally)
In source tally mode, Maestro will identify which of up to 16 specified
sources is on air and turn on a tally light located next to that source. The
tally light is connected to the rear-panel GPIO connector on the Maestro.
See
Figure 22 .