Serial Port Complete - Latest Microcontroller projects

Chapter 10

An example of an application that expects to receive data at specific times is a

computer that sends commands and expects a response after each command. If

the remote computer typically responds quickly, the application might wait for

the response:

 Dim receivedData As String

' Send a command.

myComPort.WriteLine("CMD1")

' Wait for a response.

receivedData = myComPort.ReadLine

Console.WriteLine(receivedData)

 String receivedData;

// Send a command.

myComPort.WriteLine("CMD1");

// Wait for a response.

receivedData = myComPort.ReadLine();

Console.WriteLine(receivedData);

Another option for polling is to use a Timer component to trigger periodic

reads of the port. Drag a Timer component from Visual Studio’s Toolbox onto

a form. Set the interval in milliseconds for polling the port.

 tmrPollForReceivedData.Interval = 1000
tmrPollForReceivedData.Stop()

 tmrPollForReceivedData.Interval = 1000;
tmrPollForReceivedData.Stop();
When the port has been opened, start the timer:

 tmrPollForReceivedData.Start()

 tmrPollForReceivedData.Start();