Standard Event Register
The bits used in the Standard Event Register are described as follows:
• Bit B0, Operation Complete (OPC): Set bit indicates that all pending selected device operations
are completed and the 2600B instrument is ready to accept new commands. The bit is set in
response to an *OPC command. The opc() function can be used in place of the *OPC command.
See Common commands (on page 11-1) for details on the *OPC command.
• Bit B1: Not used.
• 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 2600B instrument 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:
â–ª IEEE Std 488.2 syntax error: The 2600B instrument received a message that does not follow
the defined syntax of IEEE Std 488.2.
â–ª Semantic error: 2600B instrument received a command that was misspelled or received an
optional IEEE Std 488.2 command that is not implemented.
â–ª 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 2600B instrument front
panel was pressed.
• Bit B7, Power ON (PON): Set bit indicates that the 2600B instrument has been turned off and
turned back on since the last time this register was read.
Commands to program and read the register are summarized below and also in the Status function
summary (on page 12-3) table.
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