Picotest M3500A User Manual page 164

About the Status Byte
The conditions from other status registers will be reported by the status
byte summary register. The query data, waiting in the multimeter's
output buffer, is reported immediatedly through the "message available"
in bit 4. Besides, bits are not latched in the summary registers. In
addition, to clear an event register will clear the according bits in the
status byte summary register. And to read all messages in the output
buffer, including all pending queries, will clear the message available bit.
The following list shows the definition of each bit.
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