Actisense USG-2 Isolated USB To Serial Gateway For Use w/NMEA0183, RS422 and RS232 [USG-2]USG 2 Isolated USB To Serial Gateway For Use w NMEA0183, RS422 And RS232 The USG 2 ensures safety and reliability when connecting a PC to your NMEA 0183 network. The USG 2 converts a USB port into a bi directional serial port suitable for connecting to a marine standard NMEA 0183 data bus. It provides a far safer connection when compared to standard USB to serial converters. Electrical isolation is provided by the ISO Drive output and OPTO isolated