This thumb-sized adapter is USB powered and fully compliant with NMEA 0183 but also compatible with RS-422 and RS-232 systems. The serial input is opto-isolated and the differential output will drive either single-ended (RS-232) or differential (RS-422) interfaces. Data rates up to 38.4 Kbaud are supported. A flashing LED indicates data activity. It works with Windows, MAC, and Linux hosts.