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mation (GPIB address) must be included before the command sequence. (See PAR.3.5.3.1.1 to
establish the BOP Power Supply GPIB address.)
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 3-18 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
DISPLAY SUBSYSTEM
This subsystem controls the second line of the LCD. The first line will always display the LOCal
or REMote operation status and the constant Voltage (CV) or constant Current functioning mode
(CC).
3.6.3.3
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.
3.6.3.4
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 microseconds to 0.034 sec-
ond. The list system supports from 2950 to 5900 points per waveform, depending on the num-
ber 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 126 different dwell
times are specified, 3933 points are supported, and if each point has a different dwell, a maxi-
mum of 2950 points are supported. The number of points supported is determined automatically
by the BOP firmware.
3-52
BOP HIPWR 080709
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