Collectives™ on Stack Overflow

Find centralized, trusted content and collaborate around the technologies you use most.

Teams

Q&A for work

Connect and share knowledge within a single location that is structured and easy to search.

i am trying to change the slave Id of my energy meter by writing a new value to right register. once the value is changed the connection is obviously lost but i can't find a way to renew it. i cant close the port without closing my entire application, there is no respond to modbusClient.Disconnect(); how can i please recover the connection and continue from there?

 private void button1_Click(object sender, EventArgs e)
                ModbusClient modbusClient = new ModbusClient(ConnectionSetUp.SetValueForCom);
                modbusClient.UnitIdentifier = byte.Parse(ConnectionSetUp.SetValueForAdress);
                // Not necessary since default baudrate = 9600
                modbusClient.Baudrate = int.Parse(ConnectionSetUp.SetValueForBuad);
                modbusClient.Parity = System.IO.Ports.Parity.None;
                modbusClient.StopBits = System.IO.Ports.StopBits.One;
                modbusClient.ConnectionTimeout = int.Parse(ConnectionSetUp.SetValueDelayTime);
                modbusClient.Connect();
                int Mult = int.Parse(MeterMult.Text);
                int Adress = int.Parse(MeterAdress.Text);
                int Baud = int.Parse(MeterBaud.Text);
                //mult
                modbusClient.WriteMultipleRegisters(4001, new int[1] { Mult });
                //Adress
                modbusClient.WriteMultipleRegisters(4002, new int[1] { Adress });
                ConnectionSetUp.SetValueForAdress = string.Format("{0}", Adress);
                modbusClient.Disconnect();
                modbusClient.Disconnect();
            catch (Exception ex)
                MessageBox.Show(this, ex.Message, "bad settings",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
Without knowing what device it is, it's hard to answer this one, Possibly the device needs a restart/power cycle before it recognizes the slave ID change. You could also improve your application,it doesn't make sense for an application to shutdown because you closed a port. As to why the disconnect doesn't work well as you said you have changed the Slave ID so possibly can't disconnect if the connection settings (Slave Id) has changed from the original initial connection.
                dear Friend,   thanks for your answer. the device ID does change, but my problem is how do i recover the connection or close the port after the change? the port stays busy and i cant close it.
– Shay Avitapl
                Oct 10, 2020 at 7:56
        
Thanks for contributing an answer to Stack Overflow!
Please be sure to answer the question. Provide details and share your research!
But avoid …
Asking for help, clarification, or responding to other answers.
Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.