NI 2590/2591 User Manual Brandname: National Instruments Category: Network Card Total Pages: 44 Table of contents ImportantInformation3Compliance4Conventions6Contents7RoutingSignals9RfSwitchingPrecautions10ConnectingSignals11SoftwareChoices13Ni25902591Operation15FunctionalOverview16RelayOperation19SwitchControlCircuitry20PxiInterface21Specifications24Ni259127ServicingYourModule30