Model 6220/6221 Reference Manual IEEE-488 Bus Overview C-11
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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.
UNL (Unlisten) — Listeners are placed in the listener idle state by the UNL com-
mand.
UNT (Untalk) — Any previously commanded talkers will be placed in the talker
idle state by the UNT command.
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.
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