Hello I like this program, unfortunately there seems to be a bug: if I set up a slave, add registers, set values everything is ok. But if I export and import the register setup then my master will receive read errors with error code 1 (invalid function) This is very similar to the one described here: https://sourceforge.net/p/modbuspal/discussion/899955/thread/308caa9a/ It seems like the import would remove the default functions. Thanks for looking at this. -- Nagy Attila Gabor