PX41CX: Strange disply change

[Pierre]

(08-27-2024 07:13 PM)rawi Wrote:  I do not have a standard serial port but only a standard USB interface and I have to learn how to define this as a serial port.

If you are on a Windows system you must have the "Prolific USB-to-Serial Comm Port" driver installed and configured.
See page 20 and following of the PX-41CX manual.
Pierre