CHPA
S
ERIES
D
OC
.01023245
R
EV
.R
THIS
DOCUMENT
IS
THE
PROPERTY
OF
COMMUNICATIONS
&
POWER
INDUSTRIES.
REPRODUCTION
OR
RELEASE
WITHOUT
EXPRESS
PERMISSION
IS
STRICTLY
PROHIBITED
3-1
3-1
Chapter 3
Interfaces
3.1 Overview
Each CHPA is provided with interfaces that can be used to connect it with several optional
external devices. All remote and computer interface cables must be foil or braid-foil shielded to
meet EMC/EMI standards. The shields must be connected 360
0
to metallic D-sub connectors.
Pig-tail wiring must not be used. These interfaces are listed below:
•
Serial Remote Interface
—The default setup for this interface is for connection to a CPI
Remote Control Panel. This port can also be set up for communication with a computer via
a RS-422/485 (4-wire multi-drop) serial link.
•
RF Switch System Interface
—This interface enables switch system controllers, such as 1:1
or 1:
n
, and combiner system controllers to interface with the CHPA.
•
External Interlocks Interface
—These interlocks enable the user to interlock the CHPA with
external safety devices.
•
Computer Interface
—This interface enables the user’s computer equipment to control the
CHPA via RS-422/485 or RS-232 serial communication. Users must write all necessary
software for their computers.
•
Auxiliary Serial
—This RS-232 or RS-422/485 serial port is factory configured for RS-232
operation and is used for Flash RAM programming. Refer to Appendix B for Flash RAM
programming details.
Interface connectors for these devices are located at the rear panel of the CHPA, and are
described in the sections that follow.
3.2 CHPA Control Mode Hierarchy
The Compact High Power Amplifier (CHPA) may be controlled from five points: RF Switch
port, Interlock Interface, Local, Serial Remote, and Computer Interface (CIF). The RF Switch
port and Interlock Interface connect to switching systems and user-defined interlocks. The RF
Switch port and Interlock Interface have the highest level of control. They are active at all times;
all commands that are issued by the user through these ports must be acknowledged and acted
upon if the CHPA may physically do so.
