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How Do I Make 2-Wire or 4-Wire RS-485 or RS422 Connections

Understanding RS485: Wiring, Connection, Monitoring
The wiring requirements can then be relaxed to allow cables to run in star arrangement from the computer and the terminating resistors become optional. Line Pull Ups: Avoiding Serial Errors. In many RS485 multidrop systems there are times when no unit is driving the RS485 lines.
RS-485 Wiring Guide - go4b
PDF fileProper Wiring for RS-485 . This application note is intended to provide basic guidelines for wiring an RS-485 network. The RS-485 specification (officially called TIA/EIA-485-A) does not specifically spell out how an RS-485 network should be wired. But it does give some guidelines. These guidelines and sound engineering practices are
RS-485 Connections FAQ, 2 Wire RS485/RS232 - B&B Electronics
RS-485 Connections FAQ How Do I connections and specifications of the devices you want to connect in order to determine whether you need a "2-wire" RS-485 connection or a "4-wire" RS-485 connection. Check the Data Sheet schematic or block diagram. Figure 3 is also used for Repeaters/Optical Isolated Repeaters such as the 485RPTR,
RS-485 Pins for 2- and 4-Wire Transmission - National
The corresponding pins will depend on your device’s user manual and the RS-485 cable connector type. 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.
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