Hi, you can use node-red-contrib-modbus' Modbus Server or Modbus Flex Server nodes to do this. What is frequently confusing at first is that you need to use the Modbus write nodes to set register values (can't do it directly). You can inject to the server nodes to make them dump the registers so that you can read them, but to set register values you have to use the write nodes (TCP client nodes).
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