Modbus RTU Unit Identifier 128 and above always sending 63!

[NGame1]

Hi everyone, I'm working with EasyModbus TCP on my .NET 5 project that running on Armbian. A strange issue that I found is that when you specify a Unit Identifier above 128 (128 itself or greater) in the serial port the sent data will be like this. 63,6,0,0,0,1,86,27 witch means unit identifier is 63. My code is:

            var client = new ModbusClient("COM4") { Baudrate = 19200, StopBits = StopBits.One, Parity = Parity.None };
            while (true)
            {
                try
                {
                    client.UnitIdentifier = 128;
                    client.Connect();
                    client.WriteSingleRegister(0, 1);
                    //Console.WriteLine(client.sendData[0]);
                    Thread.Sleep(100);
                }
                catch (Exception)
                {
                }
            }

[Padanian]

128 and above require 8 bit data.

Try add databits = 8

Da: AliNGame @.> Inviato: giovedì 20 maggio 2021 12:54 A: rossmann-engineering/EasyModbusTCP.NET @.> Cc: Subscribed @.***> Oggetto: [rossmann-engineering/EasyModbusTCP.NET] Modbus RTU Unit Identifier 128 and above always sending 63! (#61)

Hi everyone, I'm working with EasyModbus TCP on my .NET 5 project that running on Armbian. A strange issue that I found is that when you specify a Unit Identifier above 128 (128 itself or greater) in the serial port the sent data will be like this. 63,6,0,0,0,1,86,27 witch means unit identifier is 63. My code is:

        var client = new ModbusClient("COM4") { Baudrate = 19200, StopBits = StopBits.One, Parity = Parity.None };
        while (true)
        {
            try
            {
                client.UnitIdentifier = 128;
                client.Connect();
                client.WriteSingleRegister(0, 1);
                //Console.WriteLine(client.sendData[0]);
                Thread.Sleep(100);
            }
            catch (Exception)
            {
            }
        }

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[NGame1]

You mean client.DataBits = 8? Databits property is not present in ModbusClient.

[Padanian]

You can change the databits property in the COM4 serialport properties.

Da: AliNGame @.> Inviato: giovedì 20 maggio 2021 13:44 A: rossmann-engineering/EasyModbusTCP.NET @.> Cc: Alessandro Mandelli @.>; Comment @.> Oggetto: Re: [rossmann-engineering/EasyModbusTCP.NET] Modbus RTU Unit Identifier 128 and above always sending 63! (#61)

You mean client.DataBits = 8? Databits property is not present in ModbusClient.

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[Padanian]

Did it work?

[NGame1]

Did it work?

I'm not at work until Saturday. I should test it on Saturday. Also, I have to find a way to set data bits to 8 on Armbian too. That's my final destination and need to work there. Anyhow, thanks for your quick replies.