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*ESR? — Event Status Register Query
Read the standard event status register and
clear it
Description
Use this command to acquire the value (in decimal) of the Standard Event Register (see Fig-
ure 4-14). The binary equivalent of the returned decimal value determines which bits in the reg-
ister are set. The register is cleared on power-up or when *CLS is sent.
A set bit in this register indicates that a particular event has occurred. For example, for an ac-
quired decimal value of 48, the binary equivalent is 00110000. From this binary value, bits B4
and B5 of the Standard Event Status Register are set. These bits indicate that a device-dependent
error and command error have occurred.
The bits of the Standard Event Status Register are described as follows:
• Bit B0, Operation Complete — A set bit indicates that all pending selected device oper-
ations are completed and the Model 2000 is ready to accept new commands. This bit
only sets in response to the *OPC? query command.
• Bit B1 — Not used
• Bit B2, Query Error (QYE) — A set bit indicates that you attempted to read data from
an empty Output Queue.
• Bit B3, Device-dependent Error (DDE) — A set bit indicates that an instrument opera-
tion did not execute properly due to some internal condition.
• Bit B4, Execution Error (EXE) — A set bit indicates that the Model 2000 detected an
error while trying to execute a command.
• Bit B5, Command Error (CME) — A set bit indicates that a command error has occurred.
Command errors include:
• IEEE-488.2 syntax error: Model 2000 received a message that does not follow the de-
fined syntax of the IEEE-488.2 standard.
• Semantic error: Model 2000 received a command that was misspelled, or received an op-
tional 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) — A set bit indicates that the LOCAL key on the Model
2000 front panel was pressed.
• Bit B7, Power ON (PON) — A set bit indicates that the Model 2000 has been turned off
and turned back on since the last time this register has been read.
4-42 Remote Operation