National Instruments FieldPoint FP-1000 User Manual
Also see for FieldPoint FP-1000: Quick start guideUser manualUser manualOperating instructionsNote to Users
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Contents
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Chapter 2 Installation and ConfigurationFieldPoint FP-1000/FP-1001 User Manual2-8 ©National Instruments CorporationFigure 2-9. Terminating RS-485 Using the Combicon AdapterAn RS-485 network also needs biasing resistors to protect the deviceson the network against noise during intervals when no RS-485 driversare transmitting on the network. The host computer’s RS-485 interfacenormally has provision for such biasing resistors. When you are usingFP-1001 network modules directly connected to a host computer’sRS-485 interface, you should use the biasing feature of the hostcomputer’s RS-485 interface for better reliability and noise immunity.The RS-485 repeater interface on the FP-1000 already has biasingresistors, so you do not need to do anything when connecting one ormore FP-1001 modules to the FP-1000.Figures 2-10 and 2-11 show typical RS-232 and RS-485 signalconnections and termination for a FieldPoint network. Figure 2-10 is amore detailed depiction of Figure 2-5, and Figure 2-11 is a moredetailed depiction of Figure 2-6.Figure 2-10. Typical Signal Connections for Host Computer Connected to OneFP-1000 and Multiple FP-1001 Network Modules120 Ω 120 Ω+–+–RS-485Signal PairRS-485Signal PairRX+RX-GNDTX-TX+To HostComputer's RS-232Receive InputFrom HostComputer's RS-232Transmit OutputGroundFP-1001 FP-1001 FP-1000120ΩTXRXTX RXRX TX120Ω120Ω120ΩConnect the TX outputs of the FP-1001 to the RX inputs of the FP-1000,and the RX inputs of the FP-1001 to the TX outputs of the FP-1000. |
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