Agilent Technologies 5000 Series Output Queue

516 Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference
7Status Reporting
Output Queue
The output queue stores the oscilloscope- to- controller responses that are
generated by certain instrument commands and queries. The output queue
generates the Message Available summary bit when the output queue
contains one or more bytes. This summary bit sets the MAV bit (bit 4) in
the Status Byte Register.
When using the Agilent VISA COM library, the output queue may be read
with the FormattedIO488 object's ReadString, ReadNumber, ReadList, or
ReadIEEEBlock methods.