RS485 connector pinout and contacts

Figure 4. RS485 pin configuration for DB 25. Figure 3 is an RS485 wiring diagram for RS485 pinout DB9 connectors. Figure 4 is a pin diagram for both 25 pin RS485 pinout half duplex and full duplex pinout connectors. The TxD+ and TxD- lines carry transmit data while the RxD+ and RxD- contain the receive data.

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For NI serial hardware connector pinout diagrams, refer to the Serial Quick Reference Guide. Half Duplex (2-Wire) For 2-wire transmission, you will need to short the transmit (TXD) and receive (RXD) signals together on the RS-485 port. Refer to Set Up 2-Wire (Half-Duplex) Communication with RS-485 Port for the pinouts and more details.

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RS-485, also known as TIA-485(-A) or EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported. The standard is jointly published by the Telecommunications Industry Association and Electronic Industries Alliance (TIA/EIA).

The DE-9 connector is the most common serial connector. This connector is found on National Instrument’s one and two port serial interfaces. Figure 1: Pinout diagram for DE-9 Connector. To perform a loopback test with no hardware flow control, you will need to connect pins 2 and 3 for RS-232 and pins 4 to 8 and 5 to 9 for RS-422/485.

RS 2-wire half-duplex, or RS 4-wire full-duplex, or RS 4-wire full- duplex Follow the wiring diagram in Figure1 to connect to a 2-wire half-duplex . RS is a good choice for long distance serial communication since using to use an RTS signal between the UART and the RS half-duplex wiring. By. Two switches are set for 2W or to the 2-Wire RS Mode.

Figure 5.An example of a pull-up and a pull-down resistor on an RS-485 bus to ensure the proper voltages on an inactive bus. The Texas Instruments SN65HVD37 IC used in this example includes a 3-state enable input to force the two driver outputs into a high-impedance state. The receiver also includes an enable signal equipment manufacturers could use to “turn off” the receiver.

For RS-485 (2-wire, point-to-point or multi-drop), terminate the wire pair at each end of the network. The diagram in Serial Network Topologies shows the correct location of the termination. Termination and Cable Length