Keysight Technologies InfiniiVision 4000 X Series

Status Reporting 41
Keysight InfiniiVision 4000 X-Series Oscilloscopes Programmer's Guide 1567
Message Queue
The message queue contains the text of the last message written to the advisory
line on the screen of the oscilloscope. The length of the oscilloscope's message
queue is 1. Note that messages sent with the :SYSTem:DSP command do not set
the MSG status bit in the Status Byte Register.