Nibeheatpump Binding: How to write registern

Hi there,
I have the Nibeheatpump Binding together with NibeGW up und running fine. Thanks for writing these fine pieces of code !

But now i´m a little bit stuck with writing settings back to my HeatPump. Can any one tell me the syntax to use for writing a certain register back ? Writing the register is enabled in the Nibeheatpump Thing…

Thanks
Best regards

Martin