![]() Transmit Data (TXD) this is the line that actually carries the transmitted data.ĭata Terminal Ready (DTR) this is the signal that shows that a computer is ready for transmission. ![]() An example is data received from a modem transferred to a computer. Receive Data (RXD) this line is used for data transmission between two sources. RS485 pinout RS485 signal line definitionsĬarrier Detect (CD) this control signal is used when a modem informs a computer that it has detected a carrier that the computer can use for data transmission. RS485 pinout DB9 connector is shown below:įigure 2.
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