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WARNING: Disconnect and lockout AC primary power prior to servicing
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5.3 Main Controller
The Main Controller is the primary interface between the transmitter and the operator
via the front panel Graphical User Interface (GUI ). It is connected to all transmitter
subsystems, both internal and external to the transmitter, through either an RS-485
serial port or the CAN (Controller Area Network) bus and dedicated parallel control
lines. The CAN bus and the parallel control lines are distributed on a single multi-
conductor cable called the System Control Bus. The Main Controller is mounted
directly behind the front control panel. It is directly connected to the front panel
switchboard which is considered a "Mezzanine" board. The front panel switchboard
uses a CPLD to serialize the I/O (the control lines and status signals) to and from the
Main Controller.
5.3.1 Transmitter Control
The Main Controller is the central point for all system control, metering and
diagnostics. It reports this information to the operator via the Graphical User Interface
(GUI) and through several remote control options.
5.3.1.1 Graphical User Interface (GUI)
The GUI is a touchscreen LCD display which is equivalent to 1/4 of a VGA display.
This is the primary local interface for the operator but is not required to operate the
transmitter. The primary operator controls, ON, OFF, RAISE, LOWER are located on
the front panel next to the GUI. Operation and navigation of the GUI is covered in
Section 4 of this manual.
5.3.1.2 Remote Controls
There are 3 remote control and monitoring options which can all access information
gathered by the Main Controller via the External I/O Board.
Standard Parallel Remote Control System: The External I/O Panel has connections
for dedicated remote control systems with the standard parallel control inputs, status
outputs, and analog metering outputs.
• One serial port, is available for operator connection to run the In-System
Programming or ISP software, supplied by Harris, to update the software for the
Main Controller and/or any other micro in the transmitter.
5.4 Control Panel and Indicator Display
The switch panel provides a local user interface that is an alternative or backup to using
the touchscreen. It provides a means to decode button pressed information and then
send the decoded information on to the various controllers for them to determine what
needs to be done. The controllers will then send back information that will determine
what button/indicators are to be lit, and what color. In the event of a CAN bus error, these
panels (one on the driver cabinet and one on each HPA system power supply cabinet)
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