CODEWITHSUNDEEP
c#.netmodbus
Real Master
Real Master

Reputation: 347

communicating with multiple slave (Modbus protocol based)

I am developing an application in which Lets says 50-60 Modbus supporting devices (Slaves) are connected to a Com Port which are communicating with my application in request response mechanism.

I want after every 15 min. request should be sent to every meter and response to be received from meter one by one. communicating with multiple slave (Modbus protocol based)

For this i am making the use of System.Timers.timer to call the method lets say ReadAllSlave() after every 15 min. In ReadAllSlave() i have used For loop to send the request and to receive response and using thread.sleep to maintain the delay..! but it seems that its not working and loop is executing in damn wired way.

private void StartPoll()
   {
      double txtSampleRate = 15 * 60 * 1000;
      timer.Interval = txtSampleRate;
      timer.AutoReset = true;
      timer.Start();
   }

void timer_Elapsed(object sender, ElapsedEventArgs e)
{
 for(int index = 0; index<meterCount; Index++)
 {
       //Sending request to connected meter..  
       mb.SendFc3(m_slaveID[0], m_startRegAdd[0], m_noOfReg[0], ref value_meter);
       if (mb.modbusStatus == "Read successful")
           {

                   //Some code for writing the values in SQL Express database
           }

       //Wait for some time so that will not get timeout error for the next 
       //request..
       Thread.Sleep(10000);

  }
}

Can any one please suggest me the best approach to implement the same.

Thanks in advance.

Upvotes: 2

Views: 2726

Answers (1)

Alexandre Vin&#231;on
Alexandre Vin&#231;on

Reputation: 954

It looks like your problem is a trivial one... You're always interrogating the same slave ! "index" is never used in your code...

What about something like this :

mb.SendFc3(m_slaveID[index], m_startRegAdd[index], m_noOfReg[index], ref value_meter);

Upvotes: 1

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