Keysight N9320B Programmer's Manual page 69

Status Byte Query
*STB?
Returns the value of the status byte register without erasing its
contents.
Range: Integer, 0 to 255
Example: If a 16 is returned, it indicates that bit 5 is set and one of the
conditions monitored in the standard event status register is set.
Self Test Query
*TST?
This query is used by some instruments for a self test.
Range: Integer, 0 to 255
Wait-to-Continue
*WAI
This command causes the instrument to wait until all pending
commands are completed before executing any additional
commands. There is no query form to the command.
Range: Integer, 0 to 255
Command Reference
IEEE Common Commands
63