Turns out Agilent instruments do not use the same defaults for the RS-232 in their instruments.
54600 series uses 1 stop bits (most common):
However other bench instruments such as power supplies (E3640 series 663X series) and 33120A arbitrary waveform generator uses 2 stop bits (fixed regardless of parity), which is usually NOT THE DEFAULT for most terminal clients:
Parity only trade away one data bit, so it does not affect stop bit
