... . Features 1, Plug and play compliant, hot swappable 2, Add 1 to 4 serial ports 3, Multi-interface RS-232 model 4 ... 5, USB port powered- no external power needed on USB to serial models Standard Accord USB1.1 or 2.0, EIA ... , TX, RTS, CTS, DTR, DSR, DCD, RI, GND Asynchronism, point to point or multi-point Band rate 300-115200bps, automatic test ...