Serial Port Complete - Latest Microcontroller projects

Chapter 9

3

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The SerialPort object’s Write method can write all or a portion of a byte array to

a port. This example creates a 3-byte array and writes the array’s contents to a

port:

 Dim byteBuffer(2) As Byte

byteBuffer(0) = 117

byteBuffer(1) = 115

byteBuffer(2) = 98

myComPort.Write(byteBuffer, 0, 3)

 byte[] byteBuffer = new byte[3];

byteBuffer[0] = 117;

byteBuffer[1] = 115;

byteBuffer[2] = 98;

myComPort.Write(byteBuffer, 0, 3);

5 &

The SerialPort class provides two methods for reading bytes.

The Read method can copy a specified number of received bytes from the

receive buffer into a byte array beginning at a specified offset.

This example reads up to three received bytes, stores the bytes beginning at off-

set 1 in the byteBuffer array, and displays the result:

 Dim byteBuffer() As Byte = {0, 0, 0, 0}
Dim count As Integer
Dim numberOfReceivedBytes As Integer

myComPort.Read(byteBuffer, 1, 3)

For count = 0 To 3

Console.WriteLine(CStr(byteBuffer(count)))

Next count