10 Best Serial Port Cards 2025

Looking for a reliable and efficient way to connect your electronics? Look no further than our top 10 list of Serial Port Cards for I/O Port Cards. We reviewed and scored many products in the electronics category and we found products ranging from a 7.6 score up to an impressive 9.4 score. At the top of our list is the StarTech.com USB to Serial Adapter - a 1 port, USB-powered device that features an FTDI USB UART Chip and DB9 (9-pin) connector. With its easy installation and reliable connection, this StarTech.com adapter is the perfect choice for anyone in need of a high-quality serial port card. Don't settle for less, upgrade to the StarTech.com USB to Serial Adapter today and experience the difference for yourself!