KEPCO BOP-ME 1KW, Руководство оператора

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BOP HIPWR 091719
3-75
3.6.1 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.
3.6.2 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).
3.6.3 SCPI SUBSYSTEM COMMAND/QUERY STRUCTURE
Subsystem commands/queries are related to specific power supply functions (such as setting
output voltage, current limit, etc.) Figure 3-27 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.
3.6.3.1 ABORT SUBSYSTEM
This subsystem allows pending trigger levels to be cancelled.
3.6.3.2 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.
3.6.3.3 LIST SUBSYSTEM
The LIST subsystem allows the BOP to generate complex waveforms by executing a series of
points in order. Each point contains a value for the main channel (either voltage or current) and
the duration (dwell) that the value will appear at the output (from 93

S to 0.034 Second. The list
system supports from 2950 to 5900 points per waveform, depending on the number of different
dwells in the waveform: For example, if each point in the list has the same duration (a single
dwell time), 5900 points are supported; if no more than 122 different dwell times are specified,
3933 points are supported, and if each point has a different dwell, a maximum of 2950 points
are supported. The number of points supported is determined automatically by the BOP firm-
ware.
The LIST subsystem includes a subsystem for waveform generation. The waveform generation
is invoked with the verb APPLY. When APPLY is added to a list:volt or list:curr command, the
BOP adds a series of points to the list arrays. The BOP can apply these points to approximate a
SINE, Triangle, RAMP (positive or negative) or square waveform or a level. The basic command
requires a type, frequency (or period for a level), a peak-to-peak amplitude (or amplitude for a
level), and offset (offset not needed for a level) The unit will create an appropriate number of
points in both the dwell and output control array to create the waveform centered on zero volts.