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 Series 3700A 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.
• 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 Series 3700A 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 Series 3700A instrument received a message that does not follow the
defined syntax of IEEE Std 488.2.
â–ª Semantic error: Series 3700A 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 Series 3700A
instrument front panel was pressed.
• Bit B7, Power ON (PON): Set bit indicates that the Series 3700A 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 C-13) table.
Figure 182: Standard Event Register
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