HP E3633A - Using Service Request (SRQ) and Serial POLL

Chapter 4 Remote Interface Reference
The SCPI Status Registers
107
4
The Status Byte Summary register is cleared when:
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The Status Byte Enable register (Request Service) is cleared when:
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Using Service Request (SRQ) and Serial POLL
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Caution The IEEE-488 standard does not ensure synchronization between your bus controller
program and the instrument. Use the *OPC? command to guarantee that commands
previously sent to the instrument have completed. Executing a serial poll before a
*RST, *CLS, or other commands have completed can cause previous conditions
to be reported.