Grass Valley NV9648 v.1.1 - Manual (Page 15)

5
NV9648
User’s Guide
Tally Interface
At the rear of the panel is a DB25 connector that provides 8 tally inputs and 4 tally outputs. (The
outputs are solid state relay outputs.) Both inputs and outputs are optically isolated.
During configuration, you can construct Boolean logic that switches the outputs on or off. The
terms of the logic expressions are states of the source and destination devices, etc., controlled
by the NV9000 control system.
During configuration, you can prescribe NV9648 behavior that depends on the tally inputs.
What you connect to the tally interface is, of course, up to you. Grass Valley provides a breakout
cable (WC0053) for the tally connector as a purchase option.
The NV9000-SE Utilities on-line help documentation calls the tally interface a GPIO interface. On
the rear of the panel, it is labeled a “GPI interface.”
See chapter 6, GPIO , on page 75, for complete detail.
Modes of Operation
The NV9648 has 3 operating modes (or behavioral models). The panel’s 27 buttons and 3
displays are used in very different ways in the 3 modes.
‘Panel Client’ Mode
When the panel is in “client” mode, it operates in conjunction with an NV9649 and other
NV9648s. The NV9649 is the “server” and the NV9648s are the “clients.” The NV9649 and the
NV9648s combine to form, in essence, a larger panel — actually a cluster of many small control
units. The NV9649, being the server, can control which sources and destinations the NV9648s
can select.
Each NV9648 has 3 identical sections and, in client mode, each section functions as a complete
and separate control unit, unrelated to the other two sections. Each displays shows a destina-
tion chosen by the operator of the NV9649.
In client mode, the control unit shows the current source in its display when the NV9649 server
is in source mode and the destination when NV9649 is in destination mode.