Agilent Technologies 1660A Series User Reference page 120

The RS-232C, GPIB, and Centronix Interface
RS-232 / GPIB Menu Map (1660A through 1663A)
The following menu map illustrates all fields and the available options
in the RS-232 / GPIB menu. The menu map will help you get an
overview as well as provide you with a quick reference of what the
RS-232 / GPIB menu contains.
RS-232 / GPIB Menu Map
7–3