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The ES-U-2102-M Dual USB to Optical isolated RS422 / RS485 Serial Adapter is designed to make serial port expansion quick and simple. Connecting to a USB port on your computer or USB hub, the USB Serial Adapter instantly adds two RS422, or RS485 serial communication ports to your system. The USB Serial Adapter makes it easier to add serial ports and serial devices to your system with easy plug-and-play and hot plug features. Designed with two external 4-pin dip switch ( one per port ) to set RS422 or RS485 mode conveniently. Both a 6-pin terminal block and a DB9 male connector are available on each channel for optimal flexibility for serial connection. Unique feature of supplying power output of 5V/150mA through pin-5 of the terminal block to each of the serial devices. Optical isolation and surge protection are available on each port of the ES-U-2102-M. The two ports are also isolated from each other as well as from the host PC. The serial lines of each RS422 / RS485 port are optically isolated with 2000 volt DC optical isolation. The optical isolation protects your PC from spikes and surges on the RS422 / RS485 network, by converting the electrical pulse into an optical signal and then changing it back into an electrical pulse.The surges and spikes cannot cross the optical link. The adapter has built-in surge protection to withstand electrostatic discharge and power surges up to 25KV ESD. The USB to RS422 / RS485 Adapter provides instant connectivity to RS422, RS485 communication devices for POS, factory automation equipment, multi-drop data collection devices, bar code readers, time clocks, scales, data entry terminals, PC to PC long distance communications, ATMs and serial communication in harsh environments. ES-U-2102-M USB to Industrial I/O provides industrial solution requiring single node or multi-drop communications over short and long distance. Free downloadable Microsoft Windows WHQL-certified, Mac OS X, Linux and Windows CE Device drivers