Operating Basics
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ECO422D SD/HD Changeover Unit Instruction Manual
Operating Basics
In normal operation, the ECO422D is basically a switch that triggers whenever
an error occurs in any channel. All 11 Channels switch at the same time.
If any channel is not being used, it is mandatory that its checking function be
disabled. Otherwise it will always trigger an error and the ECO422D will not
operate properly.
This section covers the state machine discussions (what will happen when some
signals go bad) and how to adjust the user-defined inputs.
State Machine Description
Table 2--3 is a truth table that gives the various states the ECO422D outputs
based on the state of the inputs. Note that Primary is set to check a given level.
Power -- the state of the power supply.
User Config -- the state of the user configuration switch. It can either be N
(Normal) or O (Override). In Normal mode, the ECO422D will not switch to a
“bad signal.” In Override operation, the user is allowed to manually switch to a
“bad signal.”
Switch -- Indicates whether or not the Sync Source button on the front panel or
the Toggle Sync Source on the remote control has been selected. Note that the
front panel and the remote control commands are ANDed together (active low)
to produce the switch results.
P -- Primary input status -- the state of the input detector circuit on a Primary
input.
B -- Backup input status -- the state of the input detector circuit on a Backup
input.
O Auto -- Resulting output signal with the ECO422D set to “Auto Switching”
(switch on error). It can either output Primary or Backup.
O Manual -- Resulting output signal with the ECO422D set to “Manual” (no
switching on error). It can either output Primary or Backup.
0 -- bad signal.
1 -- good signal.
"
-- switch (change the current output signal).
#
-- no switch (stay with the current signal).
X -- Don’t care.
Содержание ECO422D
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Страница 19: ...Getting Started...
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Страница 37: ...Operating Basics...
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