Harris ATLAS ANALOGUE, Руководство пользователя

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7/26/05 888-2523-001 4-7
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ATLAS Analogue
4.3.4.1 Parallel Control Lines
The parallel control lines are used for quick actuation of critical functions, such as ON,
OFF, RF mute, PS mute, AC_Low and Fault Off. These lines are also the backup
control lines in Life Support mode when the Main Controller (and therefore the CAN
bus) is not operational. Each board in the control system can independently activate
some or all of the parallel control lines to protect the transmitter in case of a fault or
other condition that may adversely affect the transmitter. These parallel control signals
are duplicated in the CAN messages. The following is a brief explanation of each of the
parallel control lines included in the system control bus.
a. ON_/OFF
This command corresponds to the transmitter operator pushing the "ON" or
"OFF" button, thereby turning the transmitter on or off respectively. This signal is
high for ON and low for OFF. This is driven only by the Main Controller and is a
sense only line for the rest of the control boards.
b. /RESTRIKE (reset)
This command is monitored by all of the control boards but is driven only by the
Main Controller board. When the transmitter is already turned ON and the
operator presses the "ON" button again, this line will be pulsed low for a
minimum of 100ms. This will cause all of the controller boards to reset any faults
and status and try to return to normal operation. This line is a sense only line for
the rest of the control boards.
This command is basically a RESET pulse which will try to turn on any
transmitter components which have faulted off due to a critical fault condition. If
they are still faulty, this will be detected and the component will simply be shut
off again. This will not reset or clear the Fault Log.
c. /FLT_OFF
This command is initiated whenever a fault occurs that requires all RF to be shut
off and the PA supplies to be disabled. This is a latching type signal that requires
user input to clear the fault and turn the transmitter back on. This signal is active
low. The Main Controller, Power Block Controller, External I/O and RF Monitor
Boards monitor this line and have the ability to activate it if necessary.
d. /RF_MUTE
The /RF_MUTE line shuts down all RF output temporarily until the fault
condition is cleared. This is a non-latching signal. The Main Controller, Power
Block Controller, External I/O and RF Monitor Boards monitor this line and have
the ability to activate it if necessary.