USB Screw Lock Mechanism for Enhanced ReliabilityProvides one RS422/485 Port over USB PortEasy Serial Port Expansion over USB Port2, 500Vrms Optical Isolation and Surge ProtectionSupports 4-wire RS-422 and 2-wire RS-485 applicationsSupports RS-485 Auto Transceiver Turn Around by Unique Featured ATTA?v HardwareSupports USB Bus PowerRS422/485 Baud Rate up to 921.6KbpsUSB1.1 and USB2.0 Backward CompatibleSupports DB9-Male and Terminal Block ConnectorsHot Swappable and Plug-and-Play FeaturesCompact Size for Critical Applications