Grass Valley 2200 - Manual (Page 14)

1-6
Section 1 Ð Introduction
Editor Enable Pushbutton
The EDIT pushbutton in the External Interface area of the Control Panel (Figure 1-
4) controls editor access to the switcher. When pressed, the pushbutton lights to
indicate that the switcher can be controlled through the Editor Interface. Pressing
EDIT a second time turns the lamp off and disables editor control of the switcher.
When EDIT is turned off, protocol messages affecting switcher parameters (as
opposed to those requesting status information) are not forwarded to the switcher
as they arrive from the editor. This action by the switcher does not affect the editor,
which continues to send messages and function normally, even though it is being
ignored.
System Performance
The Editor Interface can continuously receive and process a steady stream of
commands. Although all commands are received, some time may be required to
act upon these commands. For example, transferring E-MEM
¨ registers between
the editor and the switcher may take several seconds to complete.
Any Read Command has a switcher latency of 2 Þelds; that is, the response will
occur 2 Þelds after the Read Command has been received.
All other commands except E-MEM and ConÞguration Transfer Commands have
a switcher latency of 10 Þelds.
E-MEM and ConÞguration Transfer Commands have no Þxed latency in the
switcher. The transfer will take place as soon as all higher-level commands have
been executed.
The transfer commands have a one second timeout imposed on the time between
each packet transmission.
Figure 1-4. External Interface Pushbuttons
DPM PERIPH GPI EDIT
EXTERNAL INTERFACE
0350-10