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Connecting CAN Networks

The sbRIO-9637 is populated with one IDC header to provide connections to a CAN bus. This
connector has pins for CAN_H and CAN_L, which can connect to the CAN bus signals. The
CAN port uses an NXP PCA82C251T high-speed CAN transceiver that is fully compatible
with the ISO 11898 standard and supports baud rates up to 1 Mbps.

The port has two common pins (GND) that serve as the reference ground for CAN_H and
CAN_L. You can connect the CAN bus reference ground (sometimes referred to as CAN_V-)
to one or both COM pins. The port also has an optional shield pin (SHLD) that can connect to
a shielded CAN cable. Connecting SHLD may improve signal integrity and EMC
performance.

CAN Bus Topology and Termination

A CAN bus consists of two or more CAN nodes cabled together. The CAN_H and CAN_L
pins of each node are connected to the main CAN bus cable through a short connection called
a stub. The pair of signal wires, CAN_H and CAN_L, constitutes a transmission line. If the
transmission line is not terminated, signal changes on the bus cause reflections that can cause
communication errors. The CAN bus is bidirectional, and both ends of the cable must be
terminated. However, only the two nodes at the far end of the cable, not every node on the bus,
require termination resistors.

The following figure shows a simplified diagram of a CAN bus with multiple CAN nodes and
proper termination resistor (Rt) locations.

Figure 32. CAN Bus Topology and Termination Resistor Locations

CAN

Node

CAN

Node

CAN

Node

Rt

Rt

CAN

Node

CAN_H

CAN_L

CAN_H

Bus Cable Length

CAN_L

Stub

Length

CAN_H

CAN_L

CAN_H

CAN_L

Cable Specifications

Cables must meet the physical medium requirements specified in ISO 11898, shown in the
following table. Belden cable (3084A) meets all these requirements and is suitable for most
applications.

NI sbRIO-9637 User Manual

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© National Instruments

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Summary of Contents for sbRIO-9637

Page 1: ...rutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In sto...

Page 2: ...nector User LED Status LED USB PHY USB Connector x24 Digital I O 3 3 V 5 V Tolerant On board Power Supply Power Connector SDIO Connector Real time Clock 512 MB NAND Flash CAN XCVR CAN Port 0 Connector...

Page 3: ...Clock RTC Battery 28 Internal Real Time Clock RTC 29 Integrated 3 3 V Digital I O 29 Integrated Analog Input 29 Analog Input Range 29 Integrated Analog Output 37 Analog Output Startup and Initializat...

Page 4: ...dimensions for the sbRIO 9637 Figure 2 Primary Side Dimensions in mm in 0 00 0 000 0 0 0 000 20 63 0 812 69 47 2 735 139 07 5 475 149 89 5 900 1 0 64 0 025 84 51 3 327 142 43 5 607 150 73 5 934 17 12...

Page 5: ...536 76 82 3 025 70 02 2 757 57 52 2 265 49 73 1 958 33 99 1 338 19 50 0 768 10 16 0 400 7 620 0 300 5 080 0 200 2 540 0 100 5 34 0 210 2 16 0 085 0 00 0 000 8 76 0 345 6 32 0 249 4 66 0 183 3 66 0 14...

Page 6: ...es Figure 5 Maximum Component Height of Primary Side 31 75 mm 1 250 in 96 52 mm 3 800 in Max Component Height 9 53 mm 0 375 in Min Adjacent Surface Height 9 53 mm 0 375 in Min Adjacent Surface Height...

Page 7: ...al design for rugged environments Mounting Direction Options The sbRIO 9637 Thermal Kit for NI sbRIO 9607 9627 9637 153901 02 and certain RMC accessories are designed to allow traditional M F standoff...

Page 8: ...shown in the following figure Figure 7 Mounting on a Panel or Plate 1 2 3 4 6 7 8 5 1 Exploded view of all mounting components 2 Complete assembled and mounted view 3 Mounting screws 4 Standoff 16 00...

Page 9: ...ure 8 Mounting on a Panel or Plate 1 2 3 4 5 6 7 8 9 1 Exploded view of all mounting components 2 Complete assembled and mounted view 3 Heatsink 4 Thermal Kit for NI sbRIO 9607 9627 9637 153901 02 5 N...

Page 10: ...ed with a current probe after final assembly of the end system Investigate and remove any current differences Managing Thermal Conditions Due to the small size of the sbRIO 9637 it is very important t...

Page 11: ...rounds the enclosure The following figure identifies these types of ambient temperatures Figure 10 Ambient Temperatures 1 2 3 5 4 6 1 External ambient temperature 2 Internal enclosure ambient temperat...

Page 12: ...an extended period of time in a test environment with the same thermal environmental and functional utilization characteristics as the target deployment environment You are responsible for final vali...

Page 13: ...hat side of the circuit card assembly In addition to being useful for system validation digitally reported temperatures also provide feedback about system health and can be used as triggers or set poi...

Page 14: ...mance Thermal performance of the NI sbRIO device can be maximized by implementing the following recommendations Directly mount a thermal solution such as the Thermal Kit for NI sbRIO 9607 9627 9637 15...

Page 15: ...design requirements NI recommends replicating the features of the heat spreader into your own thermal solution Use the pedestal dimensions shown in the following figure and a Bergquist GPVOUS 0 060 t...

Page 16: ...ace Designation Pedestal Corresponding Component Pedestal Height from Board Surface A ENET PHY 2 05 mm 0 081 in B USB PHY 2 00 mm 0 079 in C CPLD 2 20 mm 0 087 in D NAND Flash 2 16 mm 0 085 in E DDR M...

Page 17: ...solution to a rigid surface provides the best performance If this method is not feasible for your design minimize the amount of extra mass that only the sbRIO 9637 supports such as a heat sink or oth...

Page 18: ...ding your FPGA application to the flash of the sbRIO 9637 ensures that the FPGA is configured before the driver can access a given peripheral Refer to the Configuring FPGA Startup App section in this...

Page 19: ...cable 154041 12 Power Connector The sbRIO 9637 has a power connector to which you can connect a power supply The following table shows the pinout for the power connector Table 3 Power Connector Pinout...

Page 20: ...9637 has two RS 232 serial ports that are implemented with a shrouded header 10 position modular jack to which you can connect devices such as displays or input devices Use the Serial VIs to read fro...

Page 21: ...h a shrouded header 10 position modular jack to which you can connect devices such as displays or input devices Use the Serial VIs to read from and write to the serial port Refer to the LabVIEW Help f...

Page 22: ...rt The sbRIO 9637 has a CAN port that is implemented with a shrouded header 10 position modular jack to provide connections to a CAN bus The following figure shows the pinout for the CAN port Figure 1...

Page 23: ...2 DIO23 DIO24 DIO25 DIO26 DIO27 5 V DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND 5 V 50 49 48 47 46 45 44 43 42 41 40 39 38 3...

Page 24: ...pports Web cameras that conform to the USB Video Device Class UVC protocol as well as machine vision cameras that conform to the USB3 Vision standard and are USB 2 0 compatible Caution Do not hot swap...

Page 25: ...connector that can be used to connect to either SD or SDHC cards The following accessories are available to be used with the SD Connector Accessory Part Number 512 MB Industrially Rated SD Card 78024...

Page 26: ...s Press and hold RESET button for 5 s Press and hold RESET button for 5 s Press and hold RESET button for 5 s Console Out enabled Network settings reset RT Startup App disabled FPGA Startup App disab...

Page 27: ...e POWER LED indicators Table 11 POWER LED Indicators LED Color LED Pattern Indication Green Solid The sbRIO 9637 is powered ON Off The sbRIO 9637 is powered OFF STATUS LED Indicators The following tab...

Page 28: ...than five seconds or by enabling safe mode in MAX Refer to the Measurement Automation Explorer MAX Help for information about safe mode Blinks four times and pauses The sbRIO 9637 is in safe mode The...

Page 29: ...1 000 Mbit s data rate selected Green Solid 100 Mbit s data rate selected Off 10 Mbit s data rate selected Real Time Clock RTC Battery The sbRIO 9637 contains an RTC battery which is a lithium cell ba...

Page 30: ...tion completes unused DIO signals remain tristated Refer to 3 3 V Digital I O on 50 Pin IDC Connector section in the NI sbRIO 9637 Specifications on ni com manuals for the logic levels Integrated Anal...

Page 31: ...therefore lower resolution A smaller input range improves the resolution but large input signals may go out of range For more information about selecting ranges refer to the LabVIEW Help The following...

Page 32: ...about reducing impedance visit ni com info and entering the Info Code rdbbis Use short high quality cabling Using short high quality cables can minimize several effects that degrade accuracy includin...

Page 33: ...referenced signal Figure 25 Differential Connections with Floating and Grounded Signal Sources RD RD RD 100 k 1 M AI AI AI GND Floating Signal Source AI AI AI GND Grounded Signal Source Connecting Ana...

Page 34: ...cted to the building ground system but has an isolated ground reference point Some examples of floating signal sources are outputs of transformers thermocouples battery powered devices optical isolato...

Page 35: ...ion of how much the electric field differs between the two conductors With this type of connection the NI sbRIO device rejects both the common mode noise in the signal and the ground potential differe...

Page 36: ...e very high input impedance of the PGIA Figure 27 Differential Connections for Floating Signal Sources with Single Bias Resistor R is about 100 times source impedance of sensor AI GND R Vs Floating Si...

Page 37: ...ignificantly load the source but small enough not to produce significant input offset voltage as a result of input bias current typically 100 k to 1 M In this case connect the negative input directly...

Page 38: ...ded after applying board power The analog output is activated and initialized to 0 V the first time the FPGA is loaded with a bitfile in which either AI or AO functionality of the board is used The AO...

Page 39: ...Exceeding the power limits may cause unpredictable device behavior Total power requirement int 5 where Pint is the power consumption by the NI sbRIO device internal operation including integrated I O...

Page 40: ...a specific application NI recommends that you directly measure a board running the application in an environment representative of the intended use case Configuring the sbRIO 9637 You can connect the...

Page 41: ...ary network interfaces on the host computer such as a wireless access card on a laptop 2 Ensure that any anti virus and firewall software running on the host computer allows connections to the host co...

Page 42: ...Address control e Enter values for IPv4 Address Subnet Mask Gateway and DNS Server based on the information you recorded Be sure to enter a value for IPv4 Address that is not used by another device on...

Page 43: ...RIO 9637 with this setting on prevents any LabVIEW startup applications from running Disable FPGA Startup App Rebooting the sbRIO 9637 with this setting on prevents autoloading of any FPGA application...

Page 44: ...t connection called a stub The pair of signal wires CAN_H and CAN_L constitutes a transmission line If the transmission line is not terminated signal changes on the bus cause reflections that can caus...

Page 45: ...t rate of 1 Mb s The ISO 11898 specification allows for significantly longer cable lengths at lower bit rates but NI recommends that you analyze each node for signal integrity problems Number of CAN N...

Page 46: ...plication Engineers Visit ni com services for NI Factory Installation Services repairs extended warranty and other services Visit ni com register to register your NI product Product registration facil...

Page 47: ...readme file for your NI product Refer to the Export Compliance Information at ni com legal export compliance for the NI global trade compliance policy and how to obtain relevant HTS codes ECCNs and ot...

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