C# timer usage in Modbus cmmunication protocol

Emma Emma

13y4.3kVisual Basic .NET

HI,

I am working on Modbus RTU protocol now. But get something unclear about the thread...or timer....

Can anyone explain it to me? Any example? I read a lot, but just do not understand! Thanks

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Luu Hoang9y ago
Programming Modbus RTU with Visual C#
https://www.youtube.com/playlist?list=PLRCEJ0bGSS1Z31_EJnVLjSfo38kH8klvI

Programming Modbus RTU with Visual Basic
https://www.youtube.com/watch?v=recduwf7jY8&list=PLRCEJ0bGSS1aWsVlwpEthiufoux0eGxx9
Emma Emma13y ago
Hi, Now i figured out that I need to use Timer in my app. But do you know the procedure of reading register values from Modbus RTU slave? Looks like I need to open the port, close the port ect... Thanks so much
Emma Emma13y ago
Hi,

Thanks for your reply, but it does not look like what I want...what I mean is that I need one thread or timer..not sure to let the system to read register values automatically. So that I do not need to press the button and get the value then press the button again. I just want to know the function and how to use thread in my application.

Thanks
Amit Choudhary13y ago
Have a look at this sample:

using System;
using System.Timers;

public class TimerSample
{
private static System.Timers.Timer aTimer;

public static void Main()
{
// Create a timer with a ten second interval.
aTimer = new System.Timers.Timer(10000);

// Hook up the Elapsed event for the timer.
aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);

// Set the Interval to 2 seconds (2000 milliseconds).
aTimer.Interval = 2000;
aTimer.Enabled = true;

Console.WriteLine("Press the Enter key to exit the program.");
Console.ReadLine();

// If the timer is declared in a long-running method, use
// KeepAlive to prevent garbage collection from occurring
// before the method ends.
//GC.KeepAlive(aTimer);
}

// Specify what you want to happen when the Elapsed event is
// raised.
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
// Do you stuff here for monitoring
}
}
Emma Emma13y ago
Hi,

I want to make one software application which will read and display the Modbus RTU communication register values. I want to display all the regoister values when I connect my software and PLC.

Then one friend said that: You should take the example of RTU communication and try to connect to the plc or the Modbus RTU simulator.
Once you can read or write a register you can make a thread that keeps reading the registers from the plc.

That is why I do not know how to use thread or timer...
Hope you can understand...I have been stuck in here many days ...

thanks
Amit Choudhary13y ago
What you really want to achieve? Please elaborate your question a bit more.