Command Set - DEI PCX-7420 B Operation Manual

Command Set

A host PC can remotely control the configuration and operation of the PCX-7420 B
through its RS-232 or USB interfaces. This feature allows the user to create system-
level control software to run standardized test procedures for research, test, and
manufacturing validation environments.
Any external communication from the RS-232 or USB port automatically updates the
values on the Home screen of the front panel.
A cable connected from a computer to the USB port will disable the RS-232 port
automatically. The RS-232 port will be disabled until the USB cable is disconnected
from the PCX-7420 B.
The PCX-7420 B serial communication parameters are displayed when the user
rotates the encoder knob to the RS232/USB settings screen. The parameters are
115200 baud, 8 data bits, no parity, 1 stop bit, and no flow control. The end-of-data
packet character is the ASCII new line character ('/n'). Upon seeing the termination
character, the unit assumes the entire data packet is received and processes the
command.
The command set is based upon the SCPI (Standard Commands for Programmable
Instruments) protocol. It has been optimized for use in DEI's equipment for application
ease and device efficiency. Each command includes a string of words, and if
necessary, data or a keyword. Commands and queries must be in all capital letters.
Commands and queries that require data, denoted as n, must have a space between
the command and the data.
For every command sent to the PCX-7420 B, a response will be sent back to the user
from the PCX-7420 B. The user's software must wait for a response before sending
another command to avoid an overflow of the PCX-7420 B receive buffer.
NOTE: Any change to a command adjustment typically requires less than 200 ms to
complete.
When changing the frequency, the duty cycle will be maintained. The system will
display the new pulse width on the second home screen. It is recommended to change
the frequency and then the pulse width, unless the duty cycle is a priority to the user.
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Document #7650-0037 Rev A2. © Copyright 2019 Directed Energy, Inc. All rights reserved.