C# timer usage in Modbus cmmunication protocol

Question

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

Luu Hoang · Answer

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 Emma · Answer

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 Emma · Answer

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 Choudhary · Answer

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 Emma · Answer

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 Choudhary · Answer

What you really want to achieve? Please elaborate your question a bit more.