Farnell NI-9881 Getting Started Download

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High-Speed CAN Characteristics

Transceiver

NXP PCA82C251T

Max baud rate

1 Mbps

CAN_H, CAN_L bus lines voltage -27 to +40 VDC

CAN Supply voltage range (V

SUP

) +9 to +30 VDC

MTBF

Contact NI for Bellcore MTBF or MIL-HDBK-217F specifications.

Power Requirements

Power consumption from chassis

Active mode

1 W maximum

Sleep mode

2.55 mW maximum

Thermal dissipation (at 70 °C)

Active mode

1.25 W maximum

Sleep mode

250 mW maximum

Physical Characteristics

Dimensions

Visit

ni.com/dimensions

and search by module number.

Weight

Approximately 144 g (5.0 oz)

Safety Voltages

Connect only voltages that are within the following limits:

Maximum voltage

[1]

Port-to-COM

-27 V DC to +40 V DC maximum, Measurement Category I

NI-9881 Getting Started

Summary of Contents for NI-9881

Page 1: ...NI 9881 Getting Started 2022 07 06 ...

Page 2: ...e NI 9881 6 Cabling Requirements for the NI 9881 7 Cable Specifications 7 Termination Resistors 7 Cable Lengths 7 Number of CAN Nodes 8 NI 9881 Hardware Overview 8 NI 9881 Specifications 8 High Speed CAN Characteristics 8 Power Requirements 9 Physical Characteristics 9 Safety Voltages 9 Shock and Vibration 10 Environmental 10 NI Services 11 ni com 2 NI 9881 Getting Started ...

Page 3: ...isque de l endommager et de compromettre la protection de sécurité intégrée Safety Guidelines for Hazardous Locations The NI 9881 is suitable for use in Class I Division 2 Groups A B C D T4 hazardous locations Class I Zone 2 AEx nA IIC T4 Gc and Ex nA IIC T4 Gc hazardous locations and nonhazardous locations only Follow these guidelines if you are installing the NI 9881 in a potentially explosive e...

Page 4: ...temperatures of 40 C Ta 70 C If you are using the NI 9881 in Gas Group IIC hazardous locations you must use the device in an NI chassis that has been evaluated as Ex nC IIC T4 Ex IIC T4 Ex nA IIC T4 or Ex nL IIC T4 equipment Caution Transient protection shall be provided that is set at a level not exceeding 140 of the peak rated voltage value of 85 V at the supply terminals to the equipment Cautio...

Page 5: ...ble Connecting SHLD may improve signal integrity and EMC performance in a noisy environment Caution You must use a UL listed ITE power supply marked LPS with the NI 9881 The NI 9881 requires an external power supply of 9 to 30 V to operate Supply power to the NI 9881 VSUP pin Note Power on VSUP is required for CANopen operation The NI 9881 pinout is listed in the table below The NI 9881 features s...

Page 6: ...unication errors Because the CAN bus is bidirectional both ends of the cable must be terminated However this requirement does not mean that every node on the bus should have a termination resistor only the two nodes at the far end of the cable should have termination resistors The following figure shows a simplified diagram of a CAN bus with multiple CAN nodes and proper termination resistor Rt lo...

Page 7: ...ble 2 ISO 11898 Specifications for Characteristics of a CAN_H and CAN_L Pair of Wires Termination Resistors The termination resistors Rt should match the nominal impedance of the CAN cable and therefore comply with the values in the following table The onboard software selectable termination has a nominal value of 120 Ω If you are not using the onboard termination use the values listed in Table 3 ...

Page 8: ...ou can connect at least 30 nodes to the bus You can connect higher numbers of nodes if the nodes electrical characteristics do not degrade signal quality below ISO 11898 signal level specifications The NI 9881 electrical characteristics allow at least 110 CAN ports on a network NI 9881 Hardware Overview The NI 9881 has one full featured CAN port that is isolated from the other modules in the syste...

Page 9: ...from chassis Active mode 1 W maximum Sleep mode 2 55 mW maximum Thermal dissipation at 70 C Active mode 1 25 W maximum Sleep mode 250 mW maximum Physical Characteristics Dimensions Visit ni com dimensions and search by module number Weight Approximately 144 g 5 0 oz Safety Voltages Connect only voltages that are within the following limits Maximum voltage 1 Port to COM 27 V DC to 40 V DC maximum M...

Page 10: ...g RMS 10 Hz to 500 Hz Sinusoidal 5 g 10 Hz to 500 Hz Operating shock 30 g 11 ms half sine 50 g 3 ms half sine 18 shocks at 6 orientations Environmental Refer to the manual for the chassis you are using for more information about meeting these specifications Operating temperature IEC 60068 2 1 IEC 60068 2 2 40 C to 70 C Storage temperature IEC 60068 2 1 IEC 60068 2 2 40 C to 85 C Ingress protection...

Page 11: ... learn about NI service offerings such as calibration options repair and replacement Visit ni com register to register your NI product Product registration facilitates technical support and ensures that you receive important information updates from NI NI corporate headquarters is located at 11500 N Mopac Expwy Austin TX 78759 3504 USA National Instruments 11 NI 9881 Getting Started 2022 National ...

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