Using version 3.99d and a Modbus simulator I did this quick test to verify the driver works as expected:
- Add a ModbusTCPCom to the form
- Set the IPAddress (in my case to 127.0.0.1 since the simulator is on the same PC)
- Add a BasicLabel to the form
- Set PLCAddressValue to 40001
- Set PLCAddressKeypad to 40001
- Run the application
- Click on the BasicLabel to get a keypad, then enter a new value
The BasicLabel would then change to the new value and it would also show in the simulator