Status Structure 13-11
Status register sets
As shown in Figure 13-1, there are four status register sets in the status structure of Model
6514; 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 Figure 13-4) are described as follows:
• Bit B0, operation complete — Set bit indicates that all pending selected device opera-
tions are completed and Model 6514 is ready to accept new commands. This bit only sets
in response to the *OPC? query command. See Section 14 for details on *OPC and
*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 Model 6514 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 — Model 6514 received a message that does not follow
the defined syntax of the IEEE-488.2 standard.
→ Semantic error — Model 6514 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 Model 6514
front panel was pressed.
• Bit B7, power ON (PON) — Set bit indicates that Model 6514 has been turned off and
turned back on since the last time this register has been read.
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