Yes, i`ve seen it at the first installation, but now i forgot the second step.
By the way i found a workaround for the communication problems with the modules since i have the new power inverter. With the oszilloscope i found spike signals on the data line to the controller (rx). The problem was in many times if i only touch the ground from the controller board. These let me know, that we have an EMC problem. I tested it with an external 5V USB supply and an DC/DC Converter from my 12VBackup Battery to 5V. The problem was identical. The connection of the GND with the negativ Pole from the Batterie bank also doesnt help.The data line to Pin D7 is grounded with R2 at 4,7kohm. I changed the resistor to 1,8kohms to make the line lower sensitiv to electromagnetic signals. Now it works without errors.