If you want to communicate with serial devices such as Arduino boards, sensors, or modems, you need to use the serial port in your Visual Basic program. In this article, we will show you how to use serial port Visual Basic example code to send and receive data from a serial device.
What is Serial Port Communication
Serial port communication is a way of transferring data between devices using a serial interface. A serial interface is a set of wires that carry one bit of data at a time. The data is sent in a sequence of bits called a frame. Each frame consists of a start bit, data bits, parity bit, and stop bits.
Serial port communication can be synchronous or asynchronous. Synchronous communication means that the sender and receiver use a common clock signal to synchronize their data transmission. Asynchronous communication means that the sender and receiver do not use a common clock signal, but instead use the start and stop bits to mark the beginning and end of each frame.
How to Use Serial Port in Visual Basic
To use serial port in Visual Basic, you need to use the SerialPort class from the System.IO.Ports namespace. This class provides methods and properties to configure and control the serial port. You can also use the DataReceived event to handle incoming data from the serial device.
To use the SerialPort class, you need to add a reference to the System.IO.Ports assembly in your project. You can do this by right-clicking on your project in the Solution Explorer window and selecting Add Reference. Then, in the Reference Manager window, select Assemblies, Framework, and check the box next to System.IO.Ports.
Next, you need to declare a global variable of type SerialPort in your code. For example:
Dim serialPort As SerialPort
Then, you need to initialize the serial port with the appropriate settings for your device. You can do this in the Form_Load event handler or any other suitable place in your code. For example:
Private Sub Form_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'Create a new instance of SerialPort
serialPort = New SerialPort()
'Set the port name
serialPort.PortName = \"COM3\"
'Set the baud rate
serialPort.BaudRate = 9600
'Set the parity
serialPort.Parity = Parity.None
'Set the data bits
serialPort.DataBits = 8
'Set the stop bits
serialPort.StopBits = StopBits.One
'Set the handshake
serialPort.Handshake = Handshake.None
'Set the read timeout
serialPort.ReadTimeout = 1000
'Set the write timeout
serialPort.WriteTimeout = 1000
'Open the port
To send data to the serial device, you can use the Write or WriteLine methods of the SerialPort class. For example:
Private Sub ButtonSend_Click(sender As Object, e As EventArgs) Handles ButtonSend.Click
'Get the text from the textbox
Dim text As String = TextBoxSend.Text
'Write the text to the serial port
To receive data from the serial device, you can use the DataReceived event of the SerialPort class. This event is raised when there is data available in the input buffer of the serial port. You 061ffe29dd