Harris Atlas DVL400, Technical Manual

Page: 110 / 180

4-10 888-2473-001 2/25/03
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation ATLAS Series™
4.3.5.1.2 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. These options are
shown on the left side of Figure 4-1.
a. Standard Parallel Remote Control System - The External I/O Board has
connections for dedicated remote control systems with the standard parallel
control inputs, status outputs and analogue metering outputs.
4.3.5.2 RS-232 Serial Connections
The Main Controller has 5 serial ports (these are not for remote control
applications):
a. 2 serial ports, J5 and J6, are used to control the ITIS V-XCAST exciters.
b.
1 serial port (part of ribbon cable J11) is connected to the External I/O Board
but is not used at present.
c.
1 serial port, J90, 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.
d. 1 serial port, J7, is a spare (reserved for future use).
4.3.5.3 Life Support Mode, Main Controller
The CPLD handles most of the inputs and outputs or I/O to the Main Controller. It
also allows the CPLD to be able to maintain the transmitter on the air in a limited
protection mode called "Life Support" in case the micro module fails. In this mode,
the main function of the CPLD is to monitor the primary transmitter control and
status lines and interface the front panel controls (ON/OFF, Raise/Lower, Remote
Enable/Disable) to the rest of the transmitter.
In Life Support Mode, there is also limited remote control input available from the
External I/O Board via J11 on the Main Controller, including:
•
Remote ON and OFF
•
Remote Drive Chain Select
•
Remote Pump Select
•
Remote Raise and Lower
•
External Interlock