Comtech EF Data HPCST-5000 - Manual (Page 149)

Rev. 1 A–1
A
Appendix A.
PROGRAMMING GUIDE FOR
REDUNDANT CONTROLLER
This appendix provides programming guidelines for the HPC-1110, the controller used
for 1:1 redundant TWTA systems.
A.1 Overview
This appendix assumes that the redundant system has been installed and checked out in
accordance with the installation information. This appendix also assumes that the
hardware has been properly setup for the serial interface control link. Refer to Chapter 3
for serial interface hardware setup information.
This appendix discusses the redundant system command set, plus the communication
protocols used to implement the serial interfaces used for remote control of redundant
systems. Although a wide variety of redundant system configurations are available, a
common redundant system command set (consisting of “query” commands and “control”
commands) is used for all digitally-controlled redundant systems. This command set is
discussed in detail in Section A.3.
Note: All digital TWTAs share a common command set called the TWTA command set
(see Section A.4). The TWTA command set is different from the redundant system
command set. The communication protocols for remote control of the TWTAs are
similar to those for the redundant systems, but the message structures differ. In
particular, the message structures used for redundant systems allow for a primary address
byte (for the controller) and a secondary address byte (for the TWTAs), while the
message structure for direct remote control of TWTAs has a single address byte (for
TWTAs).