These operating instructions describe how to use the National
Instruments (NI) 9866 module. For information about installing,
configuring, and programming your system, refer to your system
documentation. The NI 9866 module 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 9866. 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.
Caution Do not operate the NI 9866 in a manner not
specified in the user manual or 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.
Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Locations
The NI 9866 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 9866 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.
Caution For Zone 2 applications, install a protection
device between the LIN signals and the NI 9866 LIN
pins. The device must prevent the LIN 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 No. 07 ATEX 0626664X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations.
The NI 9866 has one 9-pin male D-Sub connector that provides
connections to a LIN bus.
The port has two common pins (COM) that are internally
connected to the module’s isolated reference and serve as the
reference ground for LIN signal. You can connect the LIN bus
reference ground to one or both COM pins. The port also has an
optional shield pin, SHLD, that you can connect to a shielded LIN
cable. 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 9866.
The NI 9866 requires an external power supply of +8 to +18 V to
operate. Supply power to the NI 9866 V
This section deals with cabling specifications, termination
resistors, cable lengths, and the number of LIN nodes that can exist
in a system.
Cable Specifications
LIN cables should meet the physical medium requirement of a bus
RC time constant of 5 µs. For detailed formulas for calculating this
value, refer to the Line Characteristics section of the LIN
specification. Belden cable (3084A) and other unterminated
CAN/Serial quality cables meet these requirements and should be
suitable for most applications.
Cable Lengths
The maximum allowable cable length is 40 m, per the LIN
specification.
Number of LIN Devices
The maximum number of devices on a LIN bus is 16, per the LIN
specification.
LIN cables require no termination, as nodes are terminated at the
transceiver. Slave nodes typically are pulled up from the LIN bus
to VBat with a 30 kΩ resistance and a serial diode. This
termination usually is integrated into the transceiver package. The
master node requires a 1 kΩ resistor and serial diode between the
LIN bus and VBat. On NI-XNET LIN products, master
termination is software selectable; you can enable it in the API
with the NI-XNET Session Interface:LIN:Termination property.
NI 9866 Hardware Overview
The NI 9866 has one full-featured LIN port that is isolated from
the other modules in the system. The port has a LIN controller
that is fully compliant with the LIN 1.3/2.0/2.1/2.2 Specification.
The port also has an NXP TJA1028 LIN transceiver that is fully
compatible with the LIN 1.3/2.0/2.1/2.2 and SAE J2602 standard
and supports baud rates up to 20 kbps.
Connect only voltages that are within these limits.
Port-to-COM.....................................–40 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.
Refer to the product Declaration of Conformity (DoC) for
additional regulatory compliance information. To obtain
product certifications and the DoC for this product, visit
certification
, search by model number or product line, and
ni.com/
click the appropriate link in the Certification column.
Environmental Management
NI is committed to designing and manufacturing products in an
environmentally responsible manner. NI recognizes that
eliminating certain hazardous substances from our products is
beneficial to the environment and 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.
EU Customers At the end of the product life cycle, all
products must be sent to a WEEE recycling center. For
more information about WEEE recycling centers,
National Instruments WEEE initiatives, and
compliance with WEEE Directive 2002/96/EC on
Waste and Electronic Equipment, visit
The National Instruments Web site is your complete resource for
technical support. At
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.
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