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Error Messages 3
ESG Family Signal Generators Error Message Types
Error Message Types
Events do not generate more than one type of error. For example, an event that generates a
query error will not generate a device-specific, execution, or command error.
Query Errors (–499 to –400) indicate that the instrument’s output queue control has
detected a problem with the message exchange protocol described in IEEE 4888.2,
Chapter 6. Errors in this class set the query error bit (bit 2) in the event status register
(IEEE 488.2, section 11.5.1). These errors correspond to message exchange protocol errors
described in IEEE 488.2, 6.5. In this case:
• Either an attempt is being made to read data from the output queue when no output is
either present or pending, or
• data in the output queue has been lost.
Device Specific Errors (–399 to –300 and 201 to 702) indicate that a device operation
did not properly complete, possibly due to an abnormal hardware or firmware condition.
These codes are also used for self-test response errors. Errors in this class set the
device-specific error bit (bit 3) in the event status register (IEEE 488.2, section 11.5.1).
The <error_message> string for a positive error is not defined by SCPI. A positive error
indicates that the instrument detected an error within the GPIB system, within the
instrument’s firmware or hardware, during the transfer of block data, or during
calibration.
Execution Errors (–299 to –200) indicate that an error has been detected by the
instrument’s execution control block. Errors in this class set the execution error bit (bit 4)
in the event status register (IEEE 488.2, section 11.5.1). In this case:
• Either a <PROGRAM DATA> element following a header was evaluated by the device
as outside of its legal input range or is otherwise inconsistent with the device’s
capabilities, or
• a valid program message could not be properly executed due to some device condition.
Execution errors are reported after rounding and expression evaluation operations are
completed. Rounding a numeric data element, for example, is not reported as an execution
error.
Command Errors (–199 to –100) indicate that the instrument’s parser detected an
IEEE 488.2 syntax error. Errors in this class set the command error bit (bit 5) in the event
status register (IEEE 488.2, section 11.5.1). In this case:
• Either an IEEE 488.2 syntax error has been detected by the parser (a control-to-device
message was received that is in violation of the IEEE 488.2 standard. Possible
violations include a data element that violates device listening formats or whose type is
unacceptable to the device.), or
• an unrecognized header was received. These include incorrect device-specific headers
and incorrect or unimplemented IEEE 488.2 common commands.