NI-XNET CAN HS/FD

1 GETTING STARTED GUIDENI-XNET CAN HS/FDTransceiver CableFran aisDeutsch document explains how to connect to the NationalInstruments NI-XNET CAN HS/FD Transceiver Before you begin, complete the software andhardware installation procedures in your The guidelines in this document are specific tothe NI-XNET CAN HS/FD Transceiver Cable. Theother components in the system might not meet thesame safety ratings. Refer to the documentation foreach component in the system to determine the safetyand EMC ratings for the entire GuidelinesOperate the NI-XNET CAN HS/FD Transceiver Cable only asdescribed in this Surface This icon denotes that the componentmay be hot. Touching this component may result inbodily | | NI-XNET CAN HS/FD Transceiver CableCaution Do not operate the NI-XNET CAN HS/FDTransceiver Cable in a manner not specified in thisdocument. Product misuse can result in a hazard.

2 Youcan compromise the safety protection built into theproduct if the product is damaged in any way. If theproduct is damaged, return it to NI for Guidelines for Hazardous LocationsThe NI-XNET CAN HS/FD Transceiver Cable is suitable for usein Class I, Division 2, Groups A, B, C, D, T4 hazardouslocations; Class I, Zone 2, AEx nA IIC T4 and Ex nA IIC T4hazardous locations; and nonhazardous locations only. Followthese guidelines if you are installing the NI-XNET CAN HS/FDTransceiver Cable in a potentially explosive environment. Notfollowing these guidelines may result in serious injury or Do not disconnect bus-side connector unlesspower has been switched off or the area is known to Do not unplug transceiver cable unless powerhas been switched off or the area is known to CAN HS/FD Transceiver Cable | national instruments | 3 Caution Substitution of components may impairsuitability for Class I, Division For Division 2 and Zone 2 applications,install the system in an enclosure rated to at least IP54as defined by IEC/EN For Zone 2 applications, install a protectiondevice between the CAN bus and the NI-XNET CANHS/FD Transceiver Cable CAN pins.

3 The device mustprevent the CAN Port-to-COM voltage from exceeding55 V if there is a transient overvoltage Conditions for Hazardous Locations Use inEurope and InternationallyThe NI-XNET CAN HS/FD Transceiver Cable has beenevaluated as Ex nA IIC T4 Gc equipment under DEMKOC ertificate No. 12 ATEX 1202658X and is IECEx Each NI-XNET CAN HS/FD Transceiver Cable ismarked II 3G and is suitable for use in Zone 2 You must make sure that transientdisturbances do not exceed 140% of the rated | | NI-XNET CAN HS/FD Transceiver CableCaution The system shall only be used in an area ofnot more than Pollution Degree 2, as defined inIEC The system shall be mounted in anATEX/IECEx-certified enclosure with a minimumingress protection rating of at least IP54 as defined inIEC/EN The enclosure must have a door or coveraccessible only by the use of a Compatibility GuidelinesThis product was tested and complies with the regulatoryrequirements and limits for electromagnetic compatibility (EMC)stated in the product specifications.

4 These requirements andlimits provide reasonable protection against harmful interferencewhen the product is operated in the intended operationalelectromagnetic product is intended for use in industrial locations. However,harmful interference may occur in some installations, when theproduct is connected to a peripheral device or test object, or if theNI-XNET CAN HS/FD Transceiver Cable | national instruments | 5product is used in residential or commercial areas. To minimizeinterference with radio and television reception and preventunacceptable performance degradation, install and use thisproduct in strict accordance with the instructions in the , any changes or modifications to the product notexpressly approved by national instruments could void yourauthority to operate it under your local regulatory To ensure the specified EMC performance,operate this product only with shielded cables andaccessories.

5 Do not use unshielded cables oraccessories unless they are installed in a shieldedenclosure with properly designed and shielded input/output ports and connected to the product using ashielded cable. If unshielded cables or accessories arenot properly installed and shielded, the EMCspecifications for the product are no longer | | NI-XNET CAN HS/FD Transceiver CableMounting the NI-XNET CAN HS/FDTransceiver CableCaution The NI-XNET CAN HS/FD TransceiverCable is a thermally active device that dissipates to the user manual of the host this device directlyconnects to for specific information regarding thermalmanagement. Not following mounting requirementsmay affect the system ambient temperature and/or themeasurement accuracy of modules in the Transceiver Cable is intended to be routed and strain relievedsimilar to other cables, and does not require a special to the NI-XNET CAN HS/FDTransceiver CableThe NI-XNET CAN HS/FD Transceiver Cable is used with acompatible NI-XNET Transceiver Cable host CAN HS/FD Transceiver Cable | national instruments | 7 Figure 1.

6 NI-XNET CAN HS/FD Transceiver Cable ConnectionsTo CAN BusTo TransceiverCable HostThe NI-XNET CAN HS/FD Transceiver Cable has one 9-pinmale D-Sub connector that provides connections to a CAN NI-XNET CAN HS/FD Transceiver Cable has pins forCAN_H and CAN_L, to which you connect the CAN bus these signals using twisted-pair port has two common pins (COM) that are internallyconnected to the transceiver cable s isolated reference and serveas the reference ground for CAN_H and CAN_L. You canconnect the CAN bus reference ground (sometimes referred to asCAN_V) to one or both COM D-Sub connector shell connects through the NI-XNET CANHS/FD Transceiver Cable shielding to the connector on the hostport end. The shielding does not electrically connect to the | | NI-XNET CAN HS/FD Transceiver CableThe NI-XNET CAN HS/FD Transceiver Cable gets power fromthe XNET host port.

7 No external power from the CAN bus The NI-XNET CAN HS/FD Transceiver Cableis internally powered, but LIN and some other cablesmay require external power when the bus standardrequires NI-XNET CAN HS/FD Transceiver Cable pinout is listed inTable NI-XNET CAN HS/FD Transceiver Cable features software -selectable bus termination for High-Speed CAN transceivers. Onthe NI-XNET CAN HS/FD Transceiver Cable, you can enable120 termination resistors between CAN_H and CAN_Lthrough an API call. If you choose to use external termination,Table 3 lists recommended termination resistor CAN HS/FD Transceiver Cable | national instruments | 9 Table 1. Pin Assignments for theNI-XNET CAN HS/FD Transceiver CableConnectorPinSignal Name 6789123451No Connection (NC)2 CAN_L3 COM4NC5NC6 COM7 CAN_H8NC9NC10 | | NI-XNET CAN HS/FD Transceiver CableCAN Bus Topology and TerminationA CAN bus consists of two or more CAN nodes cabled CAN_H and CAN_L pins of each node are connected to themain CAN bus cable through a short connection known as a stub.

8 The pair of signal wires, CAN_H and CAN_L, constitutesa transmission line. If the transmission line is not terminated,each signal change on the bus causes reflections that may causecommunication errors. Because the CAN bus is bidirectional,both ends of the cable must be terminated. However, thisrequirement does not mean that every node on the bus shouldhave a termination resistor; only the two nodes at the far end ofthe cable should have termination 2 shows a simplified diagram of a CAN bus with multipleCAN nodes and proper termination resistor (Rt) CAN HS/FD Transceiver Cable | national instruments | 11 Figure 2. CAN Bus Topology and Termination Resistor LocationsCANNodeCANNodeCANNodeRtRtCANNod eCAN_HCAN_LCAN_HCAN_LCAN_HCAN_LCAN_HCAN_ LBus Cable LengthStubLengthConnecting a CAN Bus to the NI-XNET CANHS/FD Transceiver CableYou can connect the NI-XNET CAN HS/FD Transceiver Cableport to any location on a CAN bus.

9 Figure 3 shows one example12 | | NI-XNET CAN HS/FD Transceiver Cableof connecting the NI-XNET CAN HS/FD Transceiver Cabledirectly to one CAN 3. Connecting the NI-XNET CAN HS/FD Transceiver Cableto a CAN DeviceNI CAN/HSTransceiverCable PortCAN DeviceRtShieldedCANC able(SHLD)CAN_HCAN_LVsupCOMRt(SHLD)CAN_H CAN_LVsupCOMC able SpecificationsCables should meet the physical medium requirements specifiedin ISO 11898, shown in Table 2. Belden cable (3084A) meets allthese requirements and should be suitable for most CAN HS/FD Transceiver Cable | national instruments | 13 Table 2. ISO 11898 Specifications for Characteristics of a CAN_H andCAN_L Pair of WiresCharacteristicValue Impedance95 min, 120 nominal,140 maxLength-related resistance70 m /m nominalSpecific line delay5 ns/m nominalTermination ResistorsThe termination resistors (Rt) should match the nominalimpedance of the CAN cable and therefore comply with thevalues in Table 3.

10 The onboard, software -selectable terminationhas a nominal value of 120 . If you are not using the onboardtermination, use the values listed in Table | | NI-XNET CAN HS/FD Transceiver CableTable 3. Termination Resistor SpecificationCharacteristicValueConditio n Termination resistor,Rt100 min,120 nominal,130 maxMinimum powerdissipation:220 mWCable LengthsThe cabling characteristics and desired bit transmission ratesaffect the allowable cable length. You can find detailed cablelength recommendations in the ISO 11898, CiA DS 102, andDeviceNet 11898 specifies 40 m total cable length with a maximumstub length of m for a bit rate of 1 Mb/s. The ISO 11898specification says that significantly longer cable lengths may beallowed at lower bit rates, but you should analyze each node forsignal integrity CAN HS/FD Transceiver Cable | national instruments | 15 Number of CAN NodesThe maximum number of nodes depends on the electricalcharacteristics of the nodes on the network.