Appendix A: Specifications442RS-232 Pin/signal definitionPin No. Signal Direction Description1 DCD Input Data2 RxD Input Receive data (data in)3 TxD Output Transmit data4 DTR Output Data terminal ready5 GND ― Signal ground6 DSR Input Data set ready7 RTS Output Request to send8 CTS Input Clear to send9 RI Input Ring indicatorRS-485 Port PinoutsRS-485 Pin/signal definitionPin No. Signal Direction Description1 ― ― ―2 ― ― ―3 D+ bi-directionalData +4 ― ― ―5 ― ― ―6 D- bi-directionalData -7 ― ― ―8 ― ― ―