StarTech.com 4 Port RS-422/RS-485 Optically Isolated Serial PCI Card (DB9), PCI, 0 - 55 °C, 0 - 65 °C, 0.23 Mbit/s, Wired, 126 x 102 StarTech.com 4 Port RS-422/RS-485 Optically Isolated Serial PCI Card (DB9). Host interface: PCI. Data transfer rate: 0.23 Mbit/s, Connectivity technology: Wired, Dimensions (WxDxH): 126 x 102