With the great help on list and off I'm having some progress. When debugging it is very convenient to be able to run a program in a terminal window. Doing so immediately shows syntax errors. The program can talk to an Arduino listening on a USB simulated serial port and can create pins that can be displayed or set in halcmd. A ctrl-C closes things. The only remaining problem is that I have not found a way to read values from existing HAL pins in order to get axis positions and other useful information. Halcmd and other programs can display the value of any pin. Is reading pins created by another program not supported in python or am I just missing a vital incantation?
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