Interface: RS232 V.24, RS422 and RS485 via 9 pin plug FIFO buffer: 16C550 with 16byte Data bits: 7, 8 / Stop bits: 1 or 2 / Parity: none, even, odd, space, mark RS232 signals: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND RS422 signals: 4-wire (TXD+/-, RXD+/-) full-duplex