USB to Serial Port Circuit
Universal serial bus (USB) and serial ports are two different connection interfaces used with computers. Though they cannot connect directly with one another, they can be adapted to work together.
Serial ports used to be the standard type of connection for computer hardware. You may still have a serial port interface on your printer or monitor. Many desktop computers still have a serial port available, while most laptops have done away with them.
USBs were designed to solve the problem of having no standard interface for external computer hardware. Almost all computer accessories (including Webcams, monitors and printers) have a USBinterface.