- RS-232 port : 1
- COM :TXD, RXD, RTS, CTS, DSR, DTR, DCD, RI, GND ( without case, for I-7188XA / I-7188XC )
- COM : TXD, RXD, GND ( with case, for I-7188XC )
- 16550 compatible
- Internal FIFO : 16 bytes
- Transmission speed: 115.2K BPS max.
- Modem control
- Isolated : none
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