3-56 BOP HIPWR 1113153.6.2 COMMON COMMANDS/QUERIESCommon commands and queries are defined by the IEEE 488.2 standard to perform overallpower supply functions (such as identification, status, or synchronization) unrelated to specificpower supply operation (such as setting voltage/current). Common commands and queries arepreceded by an asterisk (*) and are defined and explained in Appendix A (see Table 4-4). Referalso to syntax considerations (PARs 3.4.3 through 3.4.6).3.6.3 SCPI SUBSYSTEM COMMAND/QUERY STRUCTURESubsystem commands/queries are related to specific power supply functions (such as settingoutput voltage, current limit, etc.) Figure 3-18 is a tree diagram illustrating the structure of SCPIsubsystem 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 SUBSYSTEMThis subsystem allows pending trigger levels to be cancelled.3.6.3.2 DISPLAY SUBSYSTEMThis subsystem controls the second line of the LCD. The first line will always display the LOCalor REMote operation status and the constant Voltage (CV) or constant Current functioning mode(CC).3.6.3.3 INITIATE SUBSYSTEMThis subsystem enables the trigger system. When a trigger is enabled, the triggering action willoccur upon receipt of a GPIB , *TRG or TRIGger command. If a trigger circuit is notenabled, all trigger commands are ignored.3.6.3.4 LIST SUBSYSTEMThe LIST subsystem allows the BOP to generate complex waveforms by executing a series ofpoints in order. Each point contains a value for the main channel (either voltage or current) andthe duration (dwell) that the value will appear at the output (from 93 S to 0.034 Second. The listsystem supports from 2950 to 5900 points per waveform, depending on the number of differentdwells in the waveform: For example, if each point in the list has the same duration (a singledwell 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 pointsare supported. The number of points supported is determined automatically by the BOP firm-ware.
