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Appendix A: Product Specifications and Pinouts
9-pin serial port pinouts
Pin.#.
Description
1.
Data.Carrier.Detect.(DCD).Input
2.
Receive.Data.(RCD).Input
3.
Transmit.Data.(TXD).Output
4.
Data.Terminal.Ready.(DTR).Output
5.
Ground.(GND)
6.
Data.Set.Ready.(DSR).Input
7.
Request.To.Send.(RTS).Output
8.
Clear.To.Send.(CTS).Input
9.
Ring.Indicator.(RI).Input
18