Model 5601ACO2 Automatic Changeover Unit
Page 3-2 Revision 1.2 OPERATION
3.1.2. Input Indicators
A INPUTS: These twenty-eight green LEDs indicate that the respective input signals from the
Master A device are present and valid. If the LED is excluded from the voting pool, the
LED will be dim.
B INPUTS: These twenty-eight green LEDs indicate that the respective input signals from the
Master B device are present and valid. If the LED is excluded from the voting pool, the
LED will be dim.
The 5601ACO2 determines that an input is present and valid according to the following criteria:
Video: Level above 70 IRE
Sync: H timing detect
SDI: Valid TRS ID
10MHz: Level above 1.0Vp-p
Word Clock: Level above 0.5Vp-p
DARS/AES: Sync word valid
LTC: Level above 0.3Vp-p
Valid sync word
3.1.3. ACO GPI Indicators
IN 1, 2: These green LEDs indicate that the corresponding ACO General Purpose Input is active
or not. The LED will be On when the GPI is active (low).
OUT 1, 2: These green LEDs indicate that the corresponding ACO General Purpose Output is
active or not. The LED will be On when the GPO is active (low).
3.1.4. Power Supply Indicators
PSU STATUS 1, 2: These green LEDs indicate that the corresponding power supply is functioning
normally.
3.2. FRONT PANEL CONTROL
The Changeover can be operated in one of three modes as selected by the three momentary contact
toggle switches on the main circuit board behind front panel. A confidence indication for these modes
is reflected on both the led’s located near the toggle switches and on the front door when the door is
fully closed.
Please note: Figure
3-2 shows the board removed slightly to show the location
of the toggle & dip switches. Do not remove the board when selecting
changeover modes.
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