KEPCO BOP-GL 1KW, Operator'S Manual

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BOP-1K-GL 111315
3-37
3.7.1 SCPI MESSAGES
There are two kinds of SCPI messages: program messages from controller to power supply,
and response messages from the power supply to the controller. Program messages consist of
one or more properly formatted commands/queries and instruct the power supply to perform an
action; the controller may send a program message at any time. Response messages consist of
formatted data; the data can contain information regarding operating parameters, power supply
state, status, or error conditions.
3.7.2 COMMON COMMANDS/QUERIES
Common commands and queries are defined by the IEEE 488.2 standard to perform overall
power supply functions (such as identification, status, or synchronization) unrelated to specific
power supply operation (such as setting voltage/current). Common commands and queries are
preceded by an asterisk (*) and are defined and explained in Appendix A (see Table 4-4). Refer
also to syntax considerations (PARs 3.4.3 through 3.4.6).
3.7.3 SCPI SUBSYSTEM COMMAND/QUERY STRUCTURE
Subsystem commands/queries are related to specific power supply functions (such as setting
output voltage, current limit, etc.) Figure 3-9 is a tree diagram illustrating the structure of SCPI
subsystem commands used in the BOP Power Supply with the “root” at the left side, and spe-
cific commands forming the branches. The following paragraphs introduce the subsystems; sub-
system commands are defined and explained in Appendix B.
3.7.3.1 ABORT SUBSYSTEM
This subsystem allows pending trigger levels to be cancelled.
3.7.3.2 INITIATE SUBSYSTEM
This subsystem enables the trigger system. When a trigger is enabled, the triggering action will
occur upon receipt of a GPIB <GET>, *TRG or TRIGger command. If a trigger circuit is not
enabled, all trigger commands are ignored.
3.7.3.3 LIST SUBSYSTEM
The LIST subsystem is used to generate transients, waveforms and execute a series of steps
(points) repeatedly. Up to 1002 power supply settings can be stored temporarily. Each setting
consists of either a voltage or current value (depending on whether the power supply has been
set to Voltage or Current mode), and a corresponding dwell time (the duration those settings are
in effect). These settings may be executed in sequence as they are entered, or executed in a
user-determined sequence that also allows individual settings to be repeated more than once.
In addition, the entire sequence may be repeated for a specific number of times, or run indefi-
nitely until commanded to stop. The sequence can also be run in reverse order to produce
inverted waveforms.