Serial Port Complete - Latest Microcontroller projects

Chapter 9

If a SerialPort object is using ASCIIEncoding and storing received data in a

String or Char array, each received byte is stored by default as a 16-bit charac-

ter:

 ' Read a String.

Dim receivedText1 As String

receivedText1 = myComPort.ReadExisting

Console.WriteLine(receivedText1)

' Read a Char array.

Dim receivedText2(3) As Char

myComPort.Read(receivedText2, 0, 4)

Console.WriteLine(receivedText2)

 // Read a String.

String receivedText1;

receivedText1=myComPort.ReadExisting();

Console.WriteLine(receivedText1);

// Read a Char array.

Char[] receivedText2 = new Char[4];

myComPort.Read(receivedText2, 0, 4);

Console.WriteLine(receivedText2);

The ReadExisting and Read methods retrieve received characters and store each

as a 16-bit value in a String.

The transmitting and receiving computers must agree on an encoding method

for the text. For example, in the code below, the transmitting computer might

think it’s transmitting a byte equal to 169 (A9h), which is the code point for a

copyright symbol (©):

 Dim charToSend as Char = ChrW(169)

myComPort.Write(charToSend)