National Instruments NI 9852 User Manual

OPERATING INSTRUCTIONS

NI 9852

2-Port, Low-Speed/Fault-Tolerant CAN Module

These operating instructions describe how to use the National
Instruments (NI) 9852 module. For information about installing,
configuring, and programming your system, refer to your system
documentation. The NI 9852 module requires the NI 985x software
(version 1.2 or higher) to be installed. The latest version of the
NI 985x software is located at

Note The safety guidelines and specifications in this

ni.com/downloads.

document are specific to the NI 9852. The other
components in your system may not meet the same safety
ratings and specifications. Refer to the documentation for
each component in your system to determine the safety
ratings and specifications for the entire system.

Safety Guidelines

Operate the NI 9852 only as described in these operating
instructions.

Hot Surface This icon denotes that the component may be

hot. Touching this component may result in bodily injury.

NI 9852 Operating Instructions 2 ni.com

Safety Guidelines for Hazardous Locations

The NI 9852 is suitable for use in Class I, Division 2, Groups A, B,
C, D, and T4 hazardous locations; Class 1, Zone 2, AEx nA II T4
and Ex nA II T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI 9852 in a
potentially explosive environment. Not following these guidelines
may result in serious injury or death.

Caution Do not disconnect I/O-side wires or connectors

unless power has been switched off or the area is known
to be nonhazardous.

Caution Do not remove modules unless power has been

switched off or the area is known to be nonhazardous.

Caution Substitution of components may impair

suitability for Class I, Division 2.

Caution For Zone 2 applications, install the

CompactRIO system in an enclosure rated to at least
IP 54 as defined by IEC 60529 and EN 60529.

© National Instruments Corp. 3 NI 9852 Operating Instructions

Caution For Zone 2 applications, install a protection

device between the CAN signals and the NI 9852 CAN
pins. The device must prevent the CAN Port-to-COM
voltage from exceeding 55 V if there is a transient
overvoltage condition.

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as EEx nA II T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations.

Wiring the NI 9852

The NI 9852 has two 9-pin male D-Sub connectors that provide
connections to a CAN bus. Each port on the NI 9852 has pins for
CAN_H and CAN_L, to which you connect the CAN bus signals.
These signals should be connected using twisted-pair cable.

NI 9852 Operating Instructions 4 ni.com

Each port has two isolated common pins (COM) that are internally
connected to the isolated reference of the module and serve as the
reference ground for CAN_H and CAN_L. Connect the CAN bus
reference ground (sometimes referred to as CAN_V–) to the COM
pin. Each port also has an optional shield pin, SHLD, that can be
connected to a shielded CAN cable. Connecting SHLD may
improve signal integrity and EMC performance in a noisy
environment.

Both of the ports on the NI 9852 require an external power supply
of +8 V to +36 V to operate. Supply power from the CAN bus to
the V

pin on CAN0, and the V

SUP0

pin on CAN1.

SUP1

Pinouts for CAN0 and CAN1 of the NI 9852 are listed in Table 1
and Table 2.

© National Instruments Corp. 5 NI 9852 Operating Instructions

Table 1. Pin Assignments for CAN0

Connector Pin Signal

1 No Connection (NC)

2 CAN_L

3 COM0

6
7
8
9

1
2
3
4
5

4 NC

5 SHLD

6 COM0

7 CAN_H

8 NC

9 V

NI 9852 Operating Instructions 6 ni.com

SUP0

Table 2. Pin Assignments for CAN1

Connector Pin Signal

1 No Connection (NC)

2 CAN_L

3 COM1

6
7
8
9

1
2
3
4
5

4 NC

5 SHLD

6 COM1

7 CAN_H

8 NC

9 V

© National Instruments Corp. 7 NI 9852 Operating Instructions

SUP1

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 known as a “stub.”
The pair of signal wires, CAN_H and CAN_L constitutes a
transmission line. Every device on a low-speed/fault-tolerant CAN
network requires a termination resistor for each CAN data line:
R

for CAN_H and R

RTH

Figure 1 shows a simplified diagram of a low-speed/fault-tolerant
CAN bus with termination resistor placements.

NI 9852 Operating Instructions 8 ni.com

for CAN_L.

RTL

Low-speed/Fault-Tolerant

CAN Device

RTL CAN_L RTH CAN_H RTL CAN_L RTH CAN_H RTL CAN_L RTH CAN_H

Low-speed/Fault-Tolerant

CAN_H

CAN_L

CAN Device

Low-speed/Fault-Tolerant

CAN Device

Figure 1. CAN Bus Topology and Termination Resistor Locations

Connecting a CAN Bus to the NI 9852

Each port of the NI 9852 can be connected to any location on a
CAN bus. Figure 2 shows one example of the connection of CAN0
of the NI 9852 directly to one CAN node, and CAN1 directly to
another CAN node. CAN0 and CAN1 require an external power
supply on the CAN bus.

© National Instruments Corp. 9 NI 9852 Operating Instructions

CAN Device

(SHLD)

CAN_H

CAN_L
V

sup0

COM0

CAN
Cable
(With

Optional

Shield)

+
–

(SHLD)

CAN_H

CAN_L

V

sup0

COM0

CAN0

External

CAN Device

(SHLD)

CAN_H

CAN_L
V

sup1

COM1

Powe r

Supply

CAN
Cable
(With

Optional

Shield)

+
–

(SHLD)

CAN_H

CAN_L

V

sup1

COM1

NI 9852

CAN1

External

Powe r

Supply

Figure 2. Connecting Both Ports of the NI 9852 to CAN Buses

NI 9852 Operating Instructions 10 ni.com

Cabling Requirements for NI 9852

This section deals with cabling specifications, termination
resistors, cable lengths, and the number of CAN nodes that can
exist in a system.

Cable Specifications

Cables should meet the physical medium requirements specified in
ISO 11898, shown in Table 3. Belden cable (3084A) meets all of
those requirements, and should be suitable for most applications.

Table 3. Specifications for Characteristics of a CAN_H and CAN_L Pair of

Characteristic Value

Length-related resistance 90 mΩ/m nominal

Length-related
capacitance:
CAN_L and ground,
CAN_H and ground,
CAN_L and CAN_H

© National Instruments Corp. 11 NI 9852 Operating Instructions

Wires

30 pF/m nominal

Determining the Necessary Termination Resistance for the Board

Unlike High-Speed CAN, Low-Speed/Fault-Tolerant CAN
requires termination at the Low-Speed/Fault-Tolerant CAN
transceiver instead of on the cable itself. Termination requires
two resistors, RTH for CAN_H and RTL for CAN_L. This
configuration allows the Philips Fault-Tolerant CAN transceiver to
detect and recover from bus faults. It is important to determine the
overall termination of the existing network, or the termination of
the individual device, before connecting it to a
Low-Speed/Fault-Tolerant port. Philips recommends an overall
RTH and RTL termination of 100 to 500 Ω (each) for a properly
terminated low-speed network.

Termination on the low-speed/fault-tolerant ports of the NI 9852 is
set through the NI 985x software to either 1 kΩ or 5 kΩ.

NI 9852 Operating Instructions 12 ni.com

Number of CAN Nodes

The maximum number of nodes depends on the electrical
characteristics of the nodes on the network. If all of the nodes meet
the requirements of Low-Speed/Fault-Tolerant CAN, up to
32 nodes may be connected to the bus.

NI 9852 Hardware Overview

The NI 9852 has two full-featured, independent CAN ports that are
isolated from each other, and from the other modules in the system.
Each port of the NI 9852 has a Philips SJA1000 CAN controller
that is CAN 2.0B-compatible and fully supports both 11-bit
and 29-bit identifiers. Each port also has a Philips TJA1054A
Low-Speed/Fault-Tolerant CAN that is fully compatible with the
ISO 11898 standard and supports baud rates up to 125 Kbps.

© National Instruments Corp. 13 NI 9852 Operating Instructions

Ext Pwr
Supply 0

_

+5 V
Reg

V

SUP0

+

COM0

Ext Pwr
Supply 1

CAN_H

CAN_L

V

SUP1

+
_

CAN

Transceiver

CAN0

+5 V
Reg

Rx Rx

Tx Tx

CAN

Controller

COM1

CAN_H

CAN_L

CAN

Transceiver

Rx

Tx

Rx

Tx

CAN

Controller

CAN1

Figure 3. NI 9852 Hardware Overview

NI 9852 Operating Instructions 14 ni.com

Sleep Mode (CompactRIO Only)

You can enable sleep mode for the CompactRIO system in
software. In sleep mode, the system consumes less power and may
dissipate less heat. Typically, when a system is in sleep mode, you
cannot communicate with the modules. Refer to the Specifications
section for more information about power consumption and
thermal dissipation.

This system sleep mode should not be confused with the NI 9852
Transceiver Mode Sleep property, which sets only the CAN port to
sleep mode. Refer to the FPGA Module topic in LabVIEW Help for
more information on the Transceiver Mode property.

© National Instruments Corp. 15 NI 9852 Operating Instructions

Specifications

The following specifications are typical for the range –40 to 70 °C
unless otherwise noted.

Low-Speed/Fault-Tolerant CAN Characteristics

Transceiver........................................ Philips TJA1054A

Max baud rate ................................... 125 Kbps

CAN_H, CAN_L bus lines

voltage............................................... –27 to +40 VDC

Supply voltage range (V

SUP0/VSUP1

CAN0 ......................................... +8 to +36 VDC

CAN1 ......................................... +8 to +36 VDC

R

............................................ 1.11 kΩ ± 0.5% or

RTH

R

............................................ 1.11 kΩ ± 0.5% or

RTL

MTBF ............................................... 1,052,836 hours at 25 °C;

NI 9852 Operating Instructions 16 ni.com

)

4.99 kΩ

4.99 kΩ

± 0.5%

± 0.5%

Bellcore Issue 6, Method 1,
Case 3, Limited Part Stress
Method

Note Contact NI for Bellcore MTBF specifications at

other temperatures or for MIL-HDBK-217F
specifications.

Power Requirements

Power consumption from chassis

Active mode

Transmitting......................... 400 mW max

Receiving .............................400 mW max

Sleep mode ................................. 25

Thermal dissipation (at 70 °C)

Active mode ............................... 1.5 W max

Sleep mode ................................. 1.2 W max

μW max

Physical Characteristics

If you need to clean the module, wipe it with a dry towel.

Weight............................................... Approx. 144 g (5.0 oz)

© National Instruments Corp. 17 NI 9852 Operating Instructions

Safety

Maximum Voltage

Connect only voltages that are within these limits.

Port-to-COM..................................... –27 to +40 VDC max,

Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. This category is for
measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.

Caution Do not connect to signals or use for

measurements within Measurement Categories II, III,
or IV.

1

The maximum voltage that can be applied or output between any port or V

terminal and a COM terminal without creating a safety hazard.

NI 9852 Operating Instructions 18 ni.com

1

Measurement Category I

SUP

Isolation Voltages

Port-to-port

Withstand.................................... 500 V

rms

, 5 s

Continuous ................................. 60 VDC,

Measurement Category I

Port-to-earth ground

Withstand.................................... 500 V

rms

, 5 s

Continuous ................................. 60 VDC,

Measurement Category I

Safety Standards

The NI 9852 is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:

• IEC 61010-1, EN 61010-1

• UL 61010-1, CSA 61010-1

Note For UL and other safety certifications, refer to the

product label, or visit
by model number or product line, and click the
appropriate link in the Certification column.

© National Instruments Corp. 19 NI 9852 Operating Instructions

ni.com/certification, search

Hazardous Locations

U.S. (UL) .......................................... Class I, Division 2,

Groups A, B, C, D, T4;
Class I, Zone 2, AEx nA
II T4

Canada (C-UL) ................................. Class I, Division 2,

Groups A, B, C, D, T4;
Class I, Zone 2, Ex nA
II T4

Europe (DEMKO)............................. EEx nA II T4

Environmental

CompactRIO modules are intended for indoor use only. For
outdoor use, mount the CompactRIO system in a suitably rated
enclosure. Refer to the installation instructions for the chassis you
are using for more information about meeting these specifications.

Operating temperature ...................... – 40 to 70 °C

Storage temperature .......................... –40 to 85 °C

Ingress protection.............................. IP 40

Operating humidity........................... 10 to 90% RH,

noncondensing

NI 9852 Operating Instructions 20 ni.com

Storage humidity............................... 5 to 95% RH,

noncondensing

Maximum altitude............................. 2,000 m

Pollution Degree (IEC 60664).......... 2

Shock and Vibration

To meet these specifications, you must panel mount the
CompactRIO system.

Operating vibration,

random (IEC 60068-2-64) ................ 5 g

Operating shock

(IEC 60068-2-27).............................. 30 g, 11 ms half sine,

Operating vibration,

sinusoidal (IEC 60068-2-6) ..............5 g, 10 to 500 Hz

© National Instruments Corp. 21 NI 9852 Operating Instructions

, 10 to 500 Hz

rms

50 g, 3 ms half sine,
18 shocks at 6 orientations

Electromagnetic Compatibility

This product is designed to meet the requirements of the following
standards of EMC for electical equipment for measurement,
control, and laboratory use:

• EN 61326 EMC requirements; Minimum Immunity

• EN 55011 Emissions; Group 1, Class A

• CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A

Note For EMC compliance, operate this device

according to product documentation.

CE Compliance

This product meets the essential requirements of applicable
European Directives, as amended for CE marking, as follows:

• 2006/95/EC; Low-Voltage Directive (safety)

• 2004/108/EC; Electromagnetic Compatibility Directive
(EMC)

NI 9852 Operating Instructions 22 ni.com

Note Refer to the Declaration of Conformity (DoC) for

this product for any additional regulatory compliance
information. To obtain the DoC for this product, visit

ni.com/certification, search by model number or

product line, and click the appropriate link in the
Certification column.

Environmental Management

National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.

For additional environmental information, refer to the NI and the
Environment Web page at
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.

© National Instruments Corp. 23 NI 9852 Operating Instructions

ni.com/environment. This page

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EU Customers At the end of their life cycle, all products

must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit

environment/weee.htm

.

ni.com/

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(For information about China RoHS compliance, go to

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ni.com/environment/rohs_china

ni.com/environment/rohs_china

(RoHS)

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National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at ni.com/support
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telephone support outside the United States, contact your local
branch office:

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Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,

© National Instruments Corp. 25 NI 9852 Operating Instructions

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Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545

NI 9852 Operating Instructions 26 ni.com

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