A Keyspan USB Serial Adapter is a device that allows a computer to connect to serial devices (such as older hardware, industrial equipment, or networking equipment) via a USB port. This adapter is useful because many modern computers no longer come with traditional RS-232 serial ports, but many legacy devices still rely on serial communication. The Keyspan USB Serial Adapter converts USB signals to serial (RS-232) signals, enabling communication between the computer and serial devices.

To ensure that the adapter works correctly, you need to install the appropriate Windows driver for it. The Keyspan USB Serial Adapter driver enables your computer to recognize the USB-to-serial converter and facilitates data transfer between the computer and the connected serial device.