VSCom USB 16 Port Serial Adapter (RS232) [Black] Adds 16 high speed RS-232 serial ports via USB connection 384 byte receive buffers & 128 byte transmit buffers Supports speeds of 300 bps to 921,600 bps RS-232 data signals: DCD, RxD, TxD, DTR, GND, DSR, RTS, CTS, RI Optionally rack-mountable and DIN-rail mountable with included hardware