SIIG''s DP 2-Port Industrial 232/422/485 Universal PCI Adapter Card with 3KV Isolation is a high performance adapter card designed to easily add two RS-232/422/485 serial ports with 15KVDC ESD and 3KV optical isolation protection to your PCI enabled desktop computer. This 2-port RS-232 adapter card delivers data transfer rates up to 921.6Kb/s, features 15KVDC ESD protection to protect both connected devices and the board itself from Electro Static Discharge, and 3KV optical isolation to increase noise isolation and protect your system from unforeseen power surges. The DP 2-Port Industrial 232/422/485 Universal PCI Adapter Card connects with space-saving RJ-45 to DB9 serial cable, and comes with a spare low profile bracket to install into either standard height or low-profile systems to offer the utmost flexibility in system chassis installation.