such as taking a measurement, or auto calibration, take a long time to execute and there
is no other way of determining when they are done. The NO COMMAND bit may be read
while commands are being executed by doing a serial poll. There is no way to read this
bit over RS232. Note that using the *STB? query to read this bit will always return the
value 0 because it will always return an answer while a command is executing - the
*STB? command itself.
Definitions of Status Bytes
Serial Polling
The 9216A is ready to perform a measurement
An unmasked bit in the LCR status register has been set.
An unmasked bit in the standard status byte has been set.
SRQ (Service Request) bit.
There are no unexecuted commands in the input queue.
Standard Event
Set by the OPC command when all measurements are complete
Set on output queue overflow (too many responses waiting to be transmitted.)
Set by an out of range parameter, or non-completion of some command due a
condition such as an incorrect operating mode.
Set by a command syntax error, or unrecognized command
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