Technical data

84 Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference
4 LAN, USB, and GPIB Interfaces
GPIB Command and Data Concepts
The GPIB interface has two modes of operation: command mode and data
mode. The interface is in the command mode when the Attention (ATN)
control line is true. The command mode is used to send talk and listen
addresses and various interface commands such as group execute trigger
(GET).
The interface is in the data mode when the ATN line is false. The data
mode is used to convey device-dependent messages across the bus. The
device-dependent messages include all of the oscilloscope- specific
commands, queries, and responses found in this manual, including
oscilloscope status information.