National Instruments NI-XNET CAN HS/FD User manual

OPERATING INSTRUCTIONS
NI-XNET CAN HS/FD
Transceiver Cable

2|ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
These operating instructions describe how to use the NI-XNET
CAN HS/FD Transceiver Cable. For information about installing,
configuring, and programming your system, refer to your system
documentation. The transceiver cable requires the latest NI-XNET
software to be installed. The latest version of the NI-XNET
software is at ni.com/downloads.
Note The safety guidelines and specifications in this
document are specific to the NI-XNET CAN HS/FD
Transceiver Cable. 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-XNET CAN HS/FD Transceiver Cable 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-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |3
Caution Do not operate the NI-XNET CAN HS/FD
Transceiver Cable in a manner not specified in these
operating instructions. Product misuse can result in a
hazard. You can compromise the safety protection built
into the product if the product is damaged in any way. If
the product is damaged, return it to National Instruments
for repair.
Safety Guidelines for Hazardous Locations
The NI-XNET CAN HS/FD Transceiver Cable 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 and Ex nA IIC T4 hazardous
locations; and nonhazardous locations only. Follow these
guidelines if you are installing the NI-XNET CAN HS/FD
Transceiver Cable in a potentially explosive environment. Not
following these guidelines may result in serious injury or death.
Caution Do not disconnect bus-side connector unless
power has been switched off or the area is known to be
nonhazardous.

4|ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
Caution Do not unplug transceiver cable 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 Division 2 and Zone 2 applications, install
the system in an enclosure rated to at least IP 54 as
defined by IEC 60529 and EN 60529.
Caution For Division 2 and Zone 2 applications, install
a protection device between the CAN bus and the
NI-XNET CAN HS/FD Transceiver Cable 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 Safe Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment
under DEMKO Certificate 12 ATEX Number (1202658X). Each
transceiver cable is marked II 3G and is suitable for use in
Zone 2 hazardous locations.

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |5
Caution You must make sure that transient disturbances
do not exceed 140% of the rated voltage.
Caution The system shall be mounted in an ATEX
certified enclosure with a minimum ingress protection rating
of at least IP54 as defined in IEC/EN 60529 and used in an
environment of not more than Pollution Degree 2.
Caution The enclosure must have a door or cover
accessible only by the use of a tool.
Mounting the NI-XNET CAN HS/FD
Transceiver Cable
Caution The NI-XNET CAN HS/FD Transceiver Cable
is a thermally active device that dissipates heat.
Refer to the user manual of the host this device directly
connects to for specific information regarding thermal
management. Not following mounting requirements may
affect the system ambient temperature and/or the
measurement accuracy of modules in the system.

6|ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
The Transceiver Cable is intended to be routed and strain relieved
similar to other cables, and does not require a special mounting
accessory.
Wiring to the NI-XNET CAN HS/FD
Transceiver Cable
The NI-XNET CAN HS/FD Transceiver Cable is used with a
compatible NI-XNET Transceiver Cable host port.
Figure 1. NI-XNET CAN HS/FD Transceiver Cable Connections
The NI-XNET CAN HS/FD Transceiver Cable has one 9-pin male
D-Sub connector that provides connections to a CAN bus. The
NI-XNET CAN HS/FD Transceiver Cable has pins for CAN_H
and CAN_L, to which you connect the CAN bus signals. Connect
these signals using twisted-pair cable.
The port has two common pins (COM) that are internally
connected to the transceiver cable’s isolated reference and serve as
To CAN Bus
To Transceiver
Cable Host
NATIONAL INSTRUMENTS

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |7
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 D-Sub connector shell connects through the NI-XNET CAN
HS/FD Transceiver Cable shielding to the connector on the host
port end. The shielding does not electrically connect to the COM
signals.
The NI-XNET CAN HS/FD Transceiver Cable gets power from
the XNET host port. No external power from the CAN bus is
required.
Note The NI-XNET CAN HS/FD Transceiver Cable is
internally powered, but LIN and some other cables may
require external power when the bus standard requires it.
The NI-XNET CAN HS/FD Transceiver Cable pinout is listed in
Table 1.
The NI-XNET CAN HS/FD Transceiver Cable features
software-selectable bus termination for High-Speed CAN
transceivers. On the NI-XNET CAN HS/FD Transceiver Cable,
you can enable 120 Ωtermination resistors between CAN_H and

8|ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
CAN_L through an API call. If you choose to use external
termination, Table 3 lists recommended termination resistor
values.
Table 1. Pin Assignments for the NI-XNET CAN HS/FD
Transceiver Cable
Connector Pin Signal
1No Connection (NC)
2CAN_L
3COM
4NC
5NC
6COM
7CAN_H
8NC
9NC
6
7
8
9
1
2
3
4
5

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |9
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. If the transmission line is not terminated,
each signal change on the bus causes reflections that may cause
communication 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.

10 |ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
Figure 2 shows a simplified diagram of a CAN bus with multiple
CAN nodes and proper termination resistor (Rt) locations.
Figure 2. CAN Bus Topology and Termination Resistor Locations
CAN
Node
CAN
Node
CAN
Node
RtRt
CAN
Node
CAN_H
CAN_L
CAN_H
CAN_L
CAN_H CAN_L CAN_H CAN_L
Bus Cable Length
Stub
Length

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |11
Connecting a CAN Bus to the NI-XNET CAN
HS/FD Transceiver Cable
You can connect the NI-XNET CAN HS/FD Transceiver Cable
port to any location on a CAN bus. Figure 3 shows one example of
connecting the NI-XNET CAN HS/FD Transceiver Cable directly
to one CAN node.
Figure 3. Connecting the NI-XNET CAN HS/FD Transceiver Cable
toaCANDevice
NI CAN/HS
Transceiver
Cable Port
CAN Device
Rt
CAN
Cable
(With
Optional
Shield)
(SHLD)
CAN_H
CAN_L
Vsup
COM
Rt
(SHLD)
CAN_H
CAN_L
Vsup
COM

12 |ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
Cabling Requirements to the NI-XNET CAN
HS/FD Transceiver Cable
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 2. Belden cable (3084A) meets all
these requirements and should be suitable for most applications.
Table 2. ISO 11898 Specifications for Characteristics of a CAN_H and
CAN_L Pair of Wires
Characteristic Value
Impedance 95 Ωmin,
120 Ωnominal,
140 Ωmax
Length-related resistance 70 mΩ/m nominal
Specific line delay 5 ns/m nominal

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |13
Termination Resistors
The termination resistors (Rt) should match the nominal
impedance of the CAN cable and therefore comply with the values
in Table 3. 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.
Cable Lengths
The cabling characteristics and desired bit transmission rates affect
the allowable cable length. You can find detailed cable length
recommendations in the ISO 11898, CiA DS 102, and DeviceNet
specifications.
ISO 11898 specifies 40 m total cable length with a maximum
stub length of 0.3 m for a bit rate of 1 Mb/s. The ISO 11898
specification says that significantly longer cable lengths may be
Table 3. Termination Resistor Specification
Characteristic Value Condition
Termination resistor, Rt100 Ωmin,
120 Ωnominal,
130 Ωmax
Minimum power
dissipation: 220 mW

14 |ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
allowed at lower bit rates, but you should analyze each node for
signal integrity problems.
Number of CAN Nodes
The maximum number of nodes depends on the electrical
characteristics of the nodes on the network. If all nodes meet the
ISO 11898 requirements, you 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-XNET CAN HS/FD Transceiver Cable electrical
characteristics allow at least 110 CAN ports on a network.

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |15
NI-XNET CAN HS/FD Transceiver Cable
Hardware Overview
The NI-XNET CAN HS/FD Transceiver Cable has one
full-featured CAN port that is isolated from the host it is plugged
into. The port has an NXP TJA1043T High-Speed CAN
transceiver that is fully compatible with the ISO 11898 standard
and supports baud rates up to 1 Mbps.
Figure 4. NI-XNET CAN HS/FD Transceiver Cable Hardware Overview
Transceiver
Isolation Barrier
To CAN Bus
To Transceiver
Cable Host

16 |ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
Inserting and Removing the NI-XNET
Transceiver Cable
The NI-XNET CAN HS/FD Transceiver Cable connects to a host
device with an active latching connector. To connect the NI-XNET
CAN HS/FD Transceiver Cable to a host device, push the
connector assembly into the host receptacle until the internal latch
snaps into position. The latch emits an audible click when engaged.
To remove the NI-XNET CAN HS/FD Transceiver Cable, push the
lock ejector forward to disengage the latch and simultaneously pull
the NI-XNET CAN HS/FD Transceiver Cable, as shown in
Figure 5.
Figure 5. Inserting and Removing the NI-XNET Transceiver Cable
Push Lock
Ejector Forward
Pull Transceiver
Cable

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |17
NI-XNET CAN HS/FD Transceiver
Cable LEDs
NI-XNET Transceiver Cables include two LEDs per port to help
you monitor hardware and bus status. LED 1 primarily indicates
whether the hardware is currently in use. LED 2 primarily indicates
the activity information of the connected bus. Each LED can
display two colors (red or green), which display in the following
four patterns:
Table 4. LED Pattern Definitions
Pattern Meaning
Off No LED illumination
Solid LED fully illuminated
Blink Blinks at a constant rate of several times per second
Activity Blinks in a pseudo-random pattern

18 |ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
Table 5. LED Pattern Indications
Condition/State LED 1 LED 2
Port identification Blinks green Blinks green
NI-XNET catastrophic error Blinks red Blinks red
No open session on hardware Off Off
Open session on hardware,
port is properly powered, and
hardware is not
communicating
Solid green Off
Hardware is communicating,
and controller is in Error
Active state
Solid green Activity green (returns
to idle/off one second
after last TX or RX)
Hardware is communicating,
and controller is in Error
Passive state
Solid green Activity red (returns to
idle/off one second
after last TX or RX)
Hardware is running, and
controller transitioned to
bus off
Solid green Solid red

NI-XNET CAN HS/FD Transceiver Cable Instructions |© National Instruments |19
Specifications
The following specifications are typical for the range -40 to 70 °C
unless otherwise noted.
High-Speed CAN Characteristics
Transceiver........................................ NXP TJA1043T
Max baud rate ................................... 1 Mbps
CAN_H, CAN_L bus lines
voltage............................................... -27 to +40 VDC
MTBF ............................................... Contact NI for Bellcore
MTBF or MIL-HDBK-217F
specifications.
Power Requirements
Thermal dissipation (at 70 °C).......... 550 mW max (active mode);
440 mW typical (active
mode)
Power consumption from
NI-XNET Transceiver Cable host .... 550 mW max (active mode);
440 mW typical (active
mode)

20 |ni.com |NI-XNET CAN HS/FD Transceiver Cable Instructions
Note The NI-XNET CAN HS/FD Transceiver Cable is
internally powered from the host and does not require
external power from the CAN Bus.
Physical Characteristics
To clean the transceiver cable, wipe it with a dry towel.
Weight............................................... Approx. 65 g (2.3 oz)
Safety
Maximum Voltage1
Connect only voltages that are within these limits.
Port-to-COM..................................... -27 to +40 VDC max,
Measurement Category I
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
1 The maximum voltage that can be applied or output between any port and a COM
terminal without creating a safety hazard.