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KA BAND OUTDOOR TWT AMPLIFIER
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CHAPTER 4
External Interfaces
4.1 Overview
This chapter describes the external interfaces available to the user. The Ka-Band TWTA external
interface connectors (J5 and J6) are located on the front panel of the unit (Figure 2-1).
4.1.1
Control Mode Hierarchy
The Ka-Band TWTA may be controlled from the front panel of the unit (LOCAL mode), via a
serial interface connector J6 (REMOTE mode) or an optional Ethernet connection. The RF Switch
Interface connector (J5) provides additional control functions for redundant system operation and
user external interlock circuits.
The LCL/RMT switch on the front panel of the amplifier determines the amplifier control mode
(LOCAL or REMOTE). The LCL/RMT switch transfers the control point from the amplifier front
panel to a remote control device. At any time, the LCL/RMT switch can be used to establish
LOCAL mode operation. (Remote control devices cannot affect selection of the LOCAL or
REMOTE control mode).
NOTE: If the amplifier is to be operated via the optional
Remote Control Unit, section 4.2 can be skipped.
4.2 Serial Interface
4.2.1 Interface
Configuration
Two user selectable communication protocols are available for this port STX/ETX (default) or
ASCII. Both RS-422/485 (4-wire multi-drop) and RS-232 serial-communications hardware
standards are supported. The RS-422/485 standard allows communication over distances as great
as 4000 feet (1200 meters) at 9600 baud. RS-232 cable lengths are limited to approximately 50 feet.
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