Hello,

this can be achieved by using a function node to control access to the registers. First you need to modify your Modbus server configuration. Increase the holding buffer size to accommodate the desired range of registers. In your case, set the holding buffer size to 20 as you want registers 0-10 for writing and 11-20 for reading in your flows.txt:

You can then create a function node to control read and write access to the registers. Place it between the Modbus server node and the debug node:

This code allows only registers 11-20 to be read and only registers 0-10 to be written. Other requests will be rejected.

You can now use the Modbus Flex Getter node and create a Modbus write message to set values in the read-only registers (11-20) from your IOT2050:

I hope this helps. Let us know how things went.

BR