RS-232 Stop Bits in Agilent Instruments

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):

RS-232 modules used in old 54600 series
54620/54640 series (newer 54600 series)

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:

E3640 series and 33120A’s RS-232 configuration.
Parity only trade away one data bit, so it does not affect stop bit
663X series powers supplies’ programming manual aren’t explicit about that except in code example

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