Hi

Anyone familiar with...
Thermia heatpump, model Robust ECO with WM HPC controller
Unit is connected over an Moxa RS485-->RS232 converter from an Niagara 4 platform
Having issues with writing to registers, reading works fine
Getting "illegal data address"

 

What write function code are you using, 6 (Write Single Register) or 16 (Write Multiple Register)?

Which register(s) are you writing to? Are they 32-bit registers?

From the manual you attached:

It is not allowed to begin or end reading or writing in the middle of a parameter element
that consist of multiple registers (long, fix etc.). Exception code "illegal data address" is
then given, but it is allowed to begin or end reading or writing between parameter
elements within a parameter.

Perhaps this is the cause?