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Do you see any errors, warnings or info in the Enterprise Browser log file? Looking at the source code there should be a lot of logging in that function.
The order in your print_run() function is wrong, you should open the port, then write to it, then close it when you are finished but I am presuming that is just a typo
I found the fault, COM1 was the wrong port. It´s the internal serial port of the MC3190.
We have an external USB<->serial converter on COM9.
Nevertheless thanks for your fast support.
Now it works.