Master MBmaster;
           try
           {
               MBmaster = new Master(IPAddr.Text, 502);
                MBmaster.OnResponseData+= new Master.ResponseData(MBmaster_OnResponseData);
                               //MBmaster.OnException += new ModbusTCP.Master.ExceptionData(MBmaster_OnException);
              // MessageBox.Show(MBmaster.OnResponseData.)
             //   readRegisters(MBmaster,2,11,2);
               MBmaster.ReadHoldingRegister(3, 2, 15, 1);
               MBmaster.ReadHoldingRegister(3, 2, 11,2);

               if (word != null) { SetText(Convert.ToString(word[word.Length-1]),1); }
               MBmaster.ReadHoldingRegister(3, 2, 13, 2);
               if (word != null) { SetText(Convert.ToString(word[word.Length - 1]), 2); }
               MBmaster.ReadHoldingRegister(3, 2, 30, 2);
               if (word != null) { SetText(Convert.ToString(word[word.Length - 1]), 3); }
               MBmaster.ReadHoldingRegister(3, 2, 32, 2);
               if (word != null) { SetText(Convert.ToString(word[word.Length - 1]), 4); }

           }
           catch (SystemException error)
           {
               MessageBox.Show(error.Message);

Hi,

I have the following problem.

I have a application which can send input data (strings, ints and bools) to a machine, using OPCdotNETlib. Now I also wanted to add a new machine so that my program can send its values using Modbus TCP. 

This example works perfect.

Then I changed some things in this example:

The radiobutton always set to word.
Unit always 1
Start address always 0
Size always 16
Only using "Read Holding Register" and "Write Multiple Register"
Connect button is now not important anymore, since it will check for connection when you click "Read Holding Register"

It still works perfect.

I tried to add this same code and principle to my program, using the already excisting Modbus class, but instead of sending the values in the TexBoxes, it has to send values from the SQL database in my program. Here is where it goes wrong.

If you look in the sample program to GetData, you can see the way the values are send. In my case, I edited the code to:

public byte[] GetData(int num, int ARecipe)
        {
            bool[] bits = new bool[num];
            byte[] data = new Byte[num];
            int[] word = new int[num];

            //check if there are any params
            if (!FParams.Any())
            {
                Console.WriteLine("");
                return null;
            }
            
            foreach (DParamvalue param in FModel.DParamvalues.AsQueryable().Where(p => p.recipeid == ARecipe))
            {
                int x = Convert.ToInt16(param.value);

                if ((x <= data.GetUpperBound(0)) && (param.value != ""))
                {
                    try { word[x] = Convert.ToInt16(param.value); }
                    catch (SystemException)
                    {
                        word[x] = Convert.ToUInt16(param.value);
                    }; //wegen/false = 0 en tellen/true = 1
                }
                else break;
            }

            data = new Byte[num * 2];
            for (int x = 0; x < num; x++)
            {
                byte[] dat = BitConverter.GetBytes((short)IPAddress.HostToNetworkOrder((short)word[x]));
                data[x * 2] = dat[0];
                data[x * 2 + 1] = dat[1];
            }

            
            return data;

        }

Where ARecipe = frecipeid (in the sql table). So for each ARecipe, it has to send the values of that specific frecipeid (which also can be 2, 3, 4 etc.).

Now the problem: my program does not send 5, 8 and 9 for example, but 0, 0 and 0. So the program is connected correctly and it can send data, but not the data I want it to send from the database.

How can I make sure it sends the data from the database?

I hope I explained it well enough and that someone can help me.

Ganesh

        ushort ID           = 3;
        byte unit           = 2;
        ushort StartAddress = 0;
        byte Length     = 1;

How to remove??=MBmaster.ReadHoldingRegister(3, 2, 0, 1);

Hello.
tell me how to register values with a comma? registers in the slave values with a comma (eg 21,6) and when getting the value of artists get 21! Thank you

private void ShowAs(object sender, System.EventArgs e)
        {
            double[] iword = new double[reg_count];
            string[] word = new string[reg_count];
         if (data.Length < 2) return;
         iword = new double[data.Length / 2];
          word = new string[data.Length / 2];
         for (int x = 0; x < data.Length; x = x + 2)
         {
          iword[x / 2] = data[x] * 256 + data[x + 1];
         word[x / 2] = iword[x / 2].ToString();
             
         }
         for (int i = 0; i < word.Length; i++)
         {
             res[i] = word[i].ToString();
         }
         }