Common Commands 8-5
F. *TST? — self-test query Run self test and read result
Use this query command to perform a checksum test on ROM. The command places the cod-
ed result (0 or 1) in the output queue. When the power supply is addressed to talk, the coded
result is sent from the output queue to the computer.
A returned value of zero (0) indicates that the test passed, and a value of one (1) indicates that
the test failed.
G. *WAI — wait-to-continue Wait until previous commands are completed
Effectively, the *WAI command is a no-op (no operation) for the power supply and therefore,
does not need to be used.
Two types of device commands exist:
• Sequential commands — A command whose operations are allowed to finish before the
next command is executed.
• Overlapped commands — A command that allows the execution of subsequent com-
mands while device operations of the overlapped command are still in progress.
The *WAI command is used to suspend the execution of subsequent commands until the de-
vice operations of all previous overlapped commands are finished. The *WAI command is not
needed for sequential commands.
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