Advantech 8-port RS-232/422/485 PCI Express Communication Card - PCI Express 2.0 x1 - 8 x RS-232/422/485 - Serial - Plug-in Card SURGE PROTECTION PCIE-1620 is an 8-port RS-232, and PCIE-1622 is an 8-port RS-232/422/485 PCI Express communication cards...