User manual

D-8 IEEE-488 Bus Overview 2400 Series SourceMeter
®
User’s Manual
Addressed multiline commands
Addressed commands are multiline commands that must be preceded by the
device listen address before that instrument will respond to the command in ques-
tion. Note that only the addressed device will respond to these commands. Both
the commands and the address preceding it are sent with ATN true.
Address commands
Addressed commands include two primary command groups and a secondary
address group. ATN is true when these commands are asserted.
Unaddress commands
The two unaddress commands are used by the controller to remove any talkers or
listeners from the bus. ATN is true when these commands are asserted.
Common commands
Common commands are commands that are common to all devices on the bus.
These commands are designated and defined by the IEEE-488.2 standard.
Generally, these commands are sent as one or more ASCII characters that tell the
device to perform a common operation, such as reset. The IEEE-488 bus treats
these commands as data in that ATN is false when the commands are transmit-
ted.
SCPI commands
SCPI commands are commands that are particular to each device on the bus.
These commands are designated by the instrument manufacturer, and are based
on the instrument model defined by the Standard Commands for Programmable
Instruments (SCPI) Consortium’s SCPI standard.
Generally, these commands are sent as one or more ASCII characters that tell the
device to perform a particular operation, such as setting a range or closing a relay.
The IEEE-488 bus treats these commands as data in that ATN is false when the
commands are
transmitted.