Thank you. That seems to be the misleading point. In the main config page, there are two possible entries for LPT ports; say 1 and 2.
In the ports and pins page, I'm using a port number, say 1, to talk to one BoB connected to the UC300. The missing bit: this "1" is NOT connected to the connector numbered "1" on the UC 300 but on the second. I agree that there is no "rule" that forces anyone to number "ports" and " associated connectors" in a coherent manner, but one would think ...
Documentation is not coherent, in my modest opinion.
cheers, Philippe