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 Configuration©National Instruments Corporation2-5FieldPoint FP-1000/FP-1001 User ManualFigure 2-6. Host Computer Connected to Three FP-1001 Network ModulesThe multidrop topology used in the networking configurations providesprotection against power failures at individual FieldPoint banks. Iteliminates the possibility that a power failure at one FP-1001 bankmight affect the communication between other banks in your network.Because the FP-1000 provides an RS-485 repeater, a power failure atthat bank will affect communications.Connecting to the Serial PortsThe following sections give information about the RS-232 and RS-485ports on the network modules, and how to connect to them.The RS-232 port on the FP-1000 network module is a full-duplexinterface. The RS-485 port on the FP-1000 and FP-1001 networkmodules are optically isolated, full-duplex interfaces.Caution: The RS-485 interface on both the FP-1000 and the FP-1001 modules isisolated from the rest of the FieldPoint system, including the power supply,backplane, and the RS-232 interface on the FP-1000. It is isolated with agalvanic and optical isolation barrier, which has been designed and testedto withstand fault voltages of up to 2500 Vrms. However, the safety ratingof this barrier is only for working voltages of up to 250 Vrms. Do not usethe isolation barrier of the RS-485 interface as a way to protect humancontact from common mode voltages of more than 250 Vrms. Also note thatwhile the RS-232 interface on the FP-1000 is isolated from the RS-485interface, it is NOT isolated from the power supply inputs (the V and Cterminals).Host Computer withRS-485 Board InstalledFP-1001FP-1001FP-1001RS-485! |
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