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2 common commands/queries, 3 scpi subsystem command/query structure, 1 calibration subsystem – KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.12 (Unit Rev 2) User Manual

Page 44: 2 debug subsystem, 3 protection subsystem, 4 sense subsystem, 5 [source:]measure subsystem, 6 [source:]input, [source:]output subsystems, Common commands/queries -10, Scpi subsystem command/query structure -10

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3-10

SERIES EL 070110

3.10.2

COMMON COMMANDS/QUERIES

Common commands and queries are defined by the IEEE 488.2 standard to perform overall
electronic load functions (such as identification, status, or synchronization) unrelated to specific
electronic load operation (such as setting voltage/current). Common commands and queries are
preceded by an asterisk (*) and are defined and explained in Appendix A. Refer also to syntax
considerations (PARs 3.10.3.9 through 3.10.6).

3.10.3

SCPI SUBSYSTEM COMMAND/QUERY STRUCTURE

Subsystem commands/queries are related to specific electronic load functions (such as setting
voltage, current limit, etc.) Figure 3-4 is a tree diagram illustrating the structure of SCPI subsys-
tem commands used in the EL Series Electronic Load with the “root” at the left side, and specific
commands forming the branches. The following paragraphs introduce the subsystems; subsys-
tem commands are defined and explained in Appendix B.

3.10.3.1 CALIBRATION SUBSYSTEM

This subsystem is used for calibration and for LAN addressing.

3.10.3.2 DEBUG SUBSYSTEM

This subsystem is used to print the SCPI command set.

3.10.3.3 PROTECTION SUBSYSTEM

This subsystem establishes limits for voltage, current and power.

3.10.3.4 SENSE SUBSYSTEM

This subsystem controls the range of the front panel AMPS and VOLTS displays.

3.10.3.5 [SOURCE:]MEASURE SUBSYSTEM

This query subsystem returns the voltage, current and power measured at the LOAD terminals.

3.10.3.6 [SOURCE:]INPUT, [SOURCE:]OUTPUT SUBSYSTEMS

This subsystem controls whether the UUT is engaged (on) or disengaged (off) from the load.

3.10.3.7 [SOURCE:]VOLTAGE, [SOURCE:]CURRENT, [SOURCE:]POWER SUBSYSTEMS

These subsystems set the mode and establish setpoints for each mode. Also establish protec-
tion limits and the range of the front panel display (VOLTS, AMPS or KW, respectively) for each
mode.

3.10.3.8 [SOURCE:]RESISTANCE, [SOURCE:]CONDUCTANCE SUBSYSTEMS

These subsystems set the mode and establish setpoints for each mode.