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 When using GPIB IEEE-488 to directly control (no application specific s/w running) these simulator types:

• GSS6700 (single channel mode - like GSS6300)
• GSS6560 (single channel mode - like GSS6300)
• GSS6300M (single channel mode -like GSS6300)
• GSS6300
• GSS6100
• GSS4200
• GSS4100

A serial poll is possible; it is a function of the GPIB control software. 

• A serial poll is a GPIB bus command
  • it is not a remote command
  • used to ascertain the current status of the simulator
  • a poll returns 8 bits
• when using a script the simulator may not be ready to process the next command
  • in this case a serial poll should be performed
  • the poll should be continued until bit 2 (Poll Validity flag) is set to a 1
    • when the simulator is busy a 0 is returned
  • bit 1 set: the simulator is then ready to be polled
• additional serial poll status bits are:
  • bit 7 set to 1 indicates an erroneous command has been received
    • reset this error condition (stop flashing health LED) by sending/querying with the "SERR ?" command
      • the "BITE" query gives additional information on the error
  • bit 3 set to 1 indicates a BITE error (Built In Test Equipment) and is often indicative of a hardware failure
  • bits 1 and 0 indicate 
    • 11 Armed (ready)
    • 10 Running
    • 00 Halted (idle)
  •  bits 4 ,5 and 6 not used