1) Small volume, easy installation
2) No power supply needed, plug and play
3) Automatic detective serial signal rate
4) Standard: USB 2.0, EIA RS232 standard
5) USB signal VCC, DATA+, DATA-, GND, FG
6) RS232 signal RX, TX, RTS, CTS, DTR, DSR, DCD, RI, GND
7) Asynchronism, point to point