HP 83751A User Manual page 205

An <error/event number> in the range [ -199, -100 ] indicates that an
IEEE 488.2 syntax error has been detected by the instrument's parser. The
occurrence of any error in this class shah cause the command error bit (bit 5)
in the event status register (IEEE 488.2, section 11.5.1) to be set. one of the
following events has occurred:
An IEEE 488.2 syntax error has been detected by the parser. That is, a
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controller-to-device message was received which is in violation of the IEEE
488.2 standard. Possible violations include a data element which violates
the device listening formats or whose type is unacceptable to the device.
An unrecognized header was received. Unrecognized headers include
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incorrect device-specific headers and incorrect or unimplemented IEEE
488.2 common commands.
A Group Execute Trigger (GET) was entered into the input buffer inside of
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an IEEE 488.2 <PROGRAM MESSAGE>.
Events that generate command errors shall not generate execution errors,
device-specific errors, or query errors; see the other error definitions in this
chapter.
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