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The ES-U-2008-M is an 8-port USB to Serial Adapter. It quickly allows the addition of eight RS422 / RS485 serial communication ports to your system by connecting to a single USB port. Each of the 8 ports can be individually configured to RS422 or RS485 modes using DIP switches. The ES-U-2008-M is provided with an external power supply (100 V - 240 V input) and can be mounted on a DIN rail using the supplied brackets. The ES-U-2008-M is compatible with a wide range of operating systems including Windows 10, 8, 7, Vista, XP, 2000, ME, 98, Server 2012, 2008, Mac, Linux and WinCE (4.2 – 7.0). The latest drivers are available from the Downloads tab on this page. Features: · DIP switches allow each port to be individually configured for RS485 full-duplex, RS485 half-duplex or RS422 modes · Industry standard FTDI FT4232H chipset and drivers . Virtual Com Port drivers make all ports appear as standard Windows COM ports · Internal FIFO buffers - 1 Kbyte transmit buffer and 1 Kbyte receive buffer per port · Full hardware and software flow control · Automatic transmit buffer control for 2-wire RS485 half-duplex operation · Serial port baud rates up to 1Mbps with non-standard rates supported · Eight DB9 male serial connectors · RS422 signals: Tx-, Tx+, Rx+, Rx-, GND, RTS-, RTS+, CTS+, CTS- RS485 signals: Full-duplex: Tx-, Tx+, Rx+, Rx-, GND Half-duplex: data-, data+, GND · Selectable Internal 120 Ohm termination resistors for Tx, Rx and CTS termination · Internal 750 Ohm biasing resistors for Tx and Rx biasing - selectable by jumper · ESD surge protection (15 KV) · Two LEDs per port indicate data transmit and receive (0.9 meter USB cable included) · External power supply (100 V - 240 V input) · Metal chassis with wall mounting; DIN rail brackets available separately · Dimensions: 171 mm x 99 mm x 46 mm / 193 mm x 99 mm x 47 mm with DIN rail brackets