Port Operations in the .NET Framework with Visual Basic
You can access your computer's serial ports through the .NET Framework classes in the System.IO.Ports namespace. The most important class, SerialPort, provides a framework for synchronous and event-driven I/O, access to pin and break states, and access to serial driver properties. It can be wrapped in a Stream object, accessible through the BaseStream property. Wrapping SerialPort in a Stream object allows the serial port to be accessed by classes that use streams. The namespace includes enumerations that simplify the control of serial ports.
You cannot use .NET Framework classes to directly access other types of ports, such as parallel ports, USB ports, and so on. To access your computer's network, see Classes Used in .NET Framework Network Operations (Visual Basic).
This table lists and describes the main enumerations used for accessing a serial port:
Specifies the control protocol used in establishing a serial port communication for a SerialPort object.
Specifies the parity bit for a SerialPort object.
Specifies the type of character that was received on the serial port of the SerialPort object.
Specifies errors that occur on the SerialPort object
Specifies the type of change that occurred on the SerialPort object.
Specifies the number of stop bits used on the SerialPort object.
This table lists and describes the main tasks for accessing a serial port:
Show available serial ports
Dial a modem attached to the serial port of a computer
Send a string to a computer's serial port
Receive a string from a computer's serial port