Farnell TRC-8543 User manual

TRC-8543
2022-06-30

Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mounting the TRC-8543. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Panel Mounting the TRC-8543. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Wiring to the TRC-8543. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CAN Bus Topology and Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connecting a CAN Bus to the TRC-8543. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cable Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
High-Speed/Flexible Data-Rate CAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Low-Speed/Fault-Tolerant CAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Termination Resistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
High-Speed/Flexible Data-Rate CAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Low-Speed/Fault-Tolerant CAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Cable Lengths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Number of CAN Nodes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
High-Speed/Flexible Data-Rate CAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Low-Speed/Fault-Tolerant CAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TRC-8543 Hardware Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inserting and Removing the TRC-8543. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TRC-8543 LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TRC-8543 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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Overview
This document explains how to connect the TRC-8543.
Note Before you begin, complete the soware and hardware installation
procedures in your chassis documentation.
Note The guidelines in this document are specific to the TRC-8543. The
other components in the system might not meet the same safety ratings.
Refer to the documentation for each component in the system to
determine the safety and EMC ratings for the entire system.
Safety Guidelines
Caution Observe all instructions and cautions in the user documentation.
Using the product in a manner not specified can damage the product and
compromise the built-in safety protection.
Attention Suivez toutes les instructions et respectez toutes les mises
en garde de la documentation d'utilisation. L'utilisation du produit de
toute autre façon que celle spécifiée risque de l'endommager et de
compromettre la protection de sécurité intégrée.
Safety Guidelines for Hazardous Locations
The TRC-8543 is suitable for use in hazardous locations; , and hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
TRC-8543 in a potentially explosive environment. Not following these guidelines
may result in serious injury or death.
© National Instruments 3
TRC-8543

Caution Do not disconnect bus-side connector unless power has been
switched o or the area is known to be nonhazardous.
Caution Do not unplug the TRC-8543 unless power has been switched o
or the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Class I,
Division 2, or Zone 2.
Caution The system must be installed in an enclosure certified for the
intended hazardous (classified) location, having a tool secured cover/door,
where a minimum protection of at least IP54 is provided.
Caution For Zone 2 applications, install a protection device between the
CAN bus and the TRC-8543CAN 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 and
Internationally
The TRC-8543 has been evaluated as equipment under DEMKO ATEX and is IECEx
certified. Each TRC-8543 is marked and is suitable for use in Zone 2 hazardous
locations, in ambient temperatures of -40 °C ≤ Ta ≤ 70 °C.
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.
Caution The system shall only be used in an area of not more than
Pollution Degree 2, as defined in IEC/EN 60664-1.
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Caution The system shall be mounted in an ATEX/IECEx-certified
enclosure with a minimum ingress protection rating of at least IP54 as
defined in IEC/EN 60079-15.
Caution The enclosure must have a door or cover accessible only by the
use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits
for electromagnetic compatibility (EMC) stated in the product specifications. These
requirements and limits provide reasonable protection against harmful interference
when the product is operated in the intended operational electromagnetic
environment.
This product is intended for use in industrial locations. However, harmful
interference may occur in some installations, when the product is connected to a
peripheral device or test object, or if the product is used in residential or
commercial areas. To minimize interference with radio and television reception and
prevent unacceptable performance degradation, install and use this product in strict
accordance with the instructions in the product documentation.
Furthermore, any changes or modifications to the product not expressly approved
by National Instruments could void your authority to operate it under your local
regulatory rules.
Notice To ensure the specified EMC performance, operate this product
only with shielded cables and accessories. Do not use unshielded cables or
accessories unless they are installed in a shielded enclosure with properly
designed and shielded input/output ports and connected to the product
using a shielded cable. If unshielded cables or accessories are not properly
installed and shielded, the EMC specifications for the product are no
longer guaranteed.
© National Instruments 5
TRC-8543

Mounting the TRC-8543
Caution The TRC-8543 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 aect the system ambient temperature
and/or the measurement accuracy of modules in the system.
Caution To meet thermal management requirements, do not zip tie more
than six cables in a bundle, and allow for air flow around the bundle. If
used with a cRIO or cDAQ chassis, mount all cables at least 152 mm
(6.0 in.) from the chassis and do not mount more than six cables directly
beneath the chassis.
You can route and strain relieve the TRC-8543 similarly to ordinary cables. You also
can panel mount it using its removable jackscrews, zip tie, or screw mount it. The
screw mounting holes support #6 and M3 screws spaced 35.56 mm (1.400 in.)
center-to-center, with minimum length of 23 mm (7/8 in.). The TRC-8543 supports
zip ties up to 5.33 mm (0.210 in.) wide.
The following figure shows jackscrews, zip tie mounting slots, and screw mounting
holes on the TRC-8543.
Figure 1. TRC-8543 Mounting Features
Panel Mounting the TRC-8543
The recommended panel mounting cutout dimensions are shown below.
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Figure 2. Recommended Cutout Dimensions
The jackscrews included with the TRC-8543 work with panel thicknesses up to
2.21 mm (0.087 in.).
Caution Tighten the jackscrews to a maximum torque of 0.56 N · m
(5.0 lb · in.).
If your panel is thicker than 2.21 mm (0.087 in.), you can mill out a recessed pocket
for the TRC-8543. The following figure shows the recommended pocket dimensions
and cutout position.
Figure 3. Recommended Pocket Dimensions
Wiring to the TRC-8543
The TRC-8543 is used with an NI-XNET interface host port.
Figure 4. TRC-8543 Connections
The TRC-8543 has one 9-pin male D-Sub connector that provides connections to a
CAN bus. The TRC-8543 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 TRC-8543
isolated reference and serve as the reference ground for CAN_H and CAN_L. You can
© National Instruments 7
TRC-8543

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 TRC-8543 shielding to the
connector on the host port end. The shielding does not electrically connect to the
COM signals.
Caution When tightening the D-Sub connector jackscrews, do not exceed
the maximum jackscrew torque of 0.56 N · m (5.0 lb · in.).
The TRC-8543 receives power from the NI-XNET host port, but also requires an
external power supply of +9 V to +30 V to operate in Low-Speed/Fault-Tolerant
mode. Supply power from the CAN bus to the VSUP pin.
Note Power on VSUP is required for Low-Speed/Fault-Tolerant CAN
operation, but is not required for High-Speed CAN operation.
The TRC-8543 features soware-selectable bus termination for both CAN High-
Speed/Flexible Data-Rate and Low-Speed/Fault-Tolerant transceivers. For High-
Speed/Flexible Data-Rate mode, you can enable 115 Ω of termination resistance
between CAN_H and CAN_L through an API call. For Low-Speed/Fault-Tolerant
mode, you can select either 1.11 kΩ or 4.99 kΩ of termination resistance for RTH and
RTL through an API call (refer to the Termination Resistors section for more
information). If you choose to use external termination, Table 4 lists recommended
termination resistor values.
The following table lists the TRC-8543 pinout.
Table 5. Pin Assignments for the TRC-8543
Connector Pin Signal Name
1 No Connection (NC)
2 CAN_L
3 COM
4 NC
5 NC
6 COM
7 CAN_H
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Connector Pin Signal Name
8 NC
9 VSUP
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.
High-Speed/Flexible Data-Rate CAN
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) locations.
Figure 5. CAN HS/FD Bus Topology and Termination Resistor Locations
Low-Speed/Fault-Tolerant CAN
Every device on a low-speed/fault-tolerant CAN network requires a termination
resistor for each CAN data line: RRTH for CAN_H and RRTL for CAN_L.
The following figure shows a simplified diagram of a low-speed/fault-tolerant CAN
bus with termination resistor placements.
© National Instruments 9
TRC-8543

Figure 6. CAN LS/FT Bus Topology and Termination Resistor Locations
High-Speed/Flexible Data-Rate CAN
You can connect the TRC-8543 port to any location on a CAN bus. The following
figure shows one example of connecting the TRC-8543 directly to one CAN node.
Figure 7. Connecting the TRC-8543 to a CAN Device
Low-Speed/Fault-Tolerant CAN
You can connect the TRC-8543 to any location on a Low-Speed/Fault-Tolerant CAN
bus. The following figure shows one example of connecting the TRC-8543 directly to
one CAN node.
Figure 8. Connecting the TRC-8543 to a CAN Device
Cable Specifications
Cables should meet the physical medium requirements specified in ISO 11898,
shown in the following tables. Belden cable (3084A) meets all these requirements
and should be suitable for most applications.
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