8-10
Status Structure
Status register sets
As shown in
, there are four status register sets in the status structure of the power
supply: standard event status, operation event status, measurement event status and questionable
event status.
Register bit descriptions
Standard event status
The used bits of the standard event register (shown in
) are described as follows:
•
Bit B0, operation complete (OPC) — Set bit indicates that all pending selected device
operations are completed and the power supply is ready to accept new commands. This
bit only sets in response to the *OPC command. See Section 9 for details on *OPC.
•
Bit B2, query error (QYE) — Set bit indicates that you attempted to read data from an
empty output queue.
•
Bit B3, device-dependent error (DDE)
— Set bit indicates that an instrument operation
did not execute properly due to some internal condition.
•
Bit B4, execution error (EXE) — Set bit indicates that the power supply detected an
error while trying to execute a command.
•
Bit B5, command error (CME)
— Set bit indicates that a command error has
occurred. Command errors include:
→
IEEE-488.2 syntax error — power supply received a message that does not follow the
defined syntax of the IEEE-488.2 standard.
→
Semantic error — power supply received a command that was misspelled or received
an optional IEEE-488.2 command that is not implemented.
→
The instrument received a group execute trigger (GET) inside a program message.
•
Bit B6, user request (URQ)
— Set bit indicates that the LOCAL key on the power
supply front panel was pressed.
•
Bit B7, power ON (PON) — Set bit indicates that the power supply has been turned off
and turned back on since the last time this register has been read.
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