StarTech.com 1 Port CardBus PCMCIA RS422 RS485 Serial Laptop Adapter Card (CB1S485) Supports RS-485 and RS-422 serial interfaces Backed by StarTech.com's lifetime warranty StarTech.com's lifetime technical support RS-485 mode supports Auto Transceiver Turn Around (ATTA) 128-byte deep FIFO per transmitter and receiver UART is 16C950 compatible to work with most serial devices Supports RS-485 and RS-422 serial interfaces Maximum data transfer rate up to 921kbps