This product is a low profile sized PCI Express bus-supported card designed for extending RS-422A/485 compatible serial communication functionality on your PC.
The product has two RS-422A/485 communication ports.
Higher noise-resistant models with isolation between a PC and bus line as well as a surge protection circuit for communication ports. With a 128-byte built-in FIFO buffer for transmission and reception of each channel, the product supports a baud rate of up to 921,600 bps.
It also comes with a Windows driver, which allows cards to be used as OS-standard COM ports.