National Instruments NI-XNET LIN User manual

OPERATING INSTRUCTIONS
NI-XNET LIN Transceiver
Cable

2|ni.com |NI-XNET LIN Transceiver Cable Operating Instructions
These operating instructions describe how to use the NI-XNET
LIN 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 LIN 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 LIN 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 LIN Transceiver Cable Operating Instructions |© National Instruments |3
Caution Do not operate the NI-XNET LIN 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 LIN 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 LIN 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 LIN Transceiver Cable Operating 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 LIN bus and the
NI-XNET LIN Transceiver Cable 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 12 ATEX Number (1202658X). Each
transceiver cable is marked II 3G and is suitable for use in
Zone 2 hazardous locations.

NI-XNET LIN Transceiver Cable Operating 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 LIN Transceiver Cable
Caution The NI-XNET LIN 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 LIN Transceiver Cable Operating 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 LIN Transceiver Cable
The NI-XNET LIN Transceiver Cable is used with a compatible
NI-XNET Transceiver Cable host port.
Figure 1. NI-XNET LIN Transceiver Cable Connections
The NI-XNET LIN Transceiver Cable 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 transceiver cable’s isolated reference and serve as
the reference ground for the LIN signal. You can connect the LIN
bus reference ground to one or both COM pins.
The D-Sub connector shell connects through the NI-XNET LIN
Transceiver Cable shielding to the connector on the host port end.
The shielding does not electrically connect to the COM signals.
To LIN Bus
To Transceiver
Cable Host
NATIONAL INSTRUMENTS

NI-XNET LIN Transceiver Cable Operating Instructions |© National Instruments |7
The NI-XNET LIN Transceiver Cable gets power from the XNET
host port but also requires an external power supply of +8 to +18 V
to operate. Supply power to the NI-XNET LIN Transceiver Cable
Vsup pin from the LIN bus.
The NI-XNET LIN Transceiver Cable pinout is listed in Table 1.
Table 1. Pin Assignments for the NI-XNET LIN Transceiver Cable
Connector Pin Signal
1No Connection (NC)
2NC
3COM
4NC
5NC
6COM
7LIN
8NC
9Vsup
6
7
8
9
1
2
3
4
5

8|ni.com |NI-XNET LIN Transceiver Cable Operating Instructions
Cabling Requirements to the NI-XNET LIN
Transceiver Cable
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 Nodes
The maximum number of devices on a LIN bus is 16, per the LIN
specification.

NI-XNET LIN Transceiver Cable Operating Instructions |© National Instruments |9
Termination Resistors
LIN cables require no termination, as nodes are terminated at the
transceiver. Slave nodes typically are pulled up from the LIN bus
to Vsup with a 30 kΩresistance and a serial diode. This
termination usually is integrated into the transceiver package. The
master node requires a 1 kΩresistor and serial diode between the
LIN bus and Vsup. 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-XNET LIN Transceiver Cable Hardware
Overview
The NI-XNET LIN Transceiver Cable has one full-featured LIN
port that is isolated from the host it is plugged into. The port has an
NXP TJA1028 LIN transceiver that is fully compatible with the
LIN 1.3/2.0/2.1/2.2 and SAE J2602 standards and supports baud
rates up to 20 kbps.

10 |ni.com |NI-XNET LIN Transceiver Cable Operating Instructions
Figure 2. NI-XNET LIN Transceiver Cable Hardware Overview
Inserting and Removing the NI-XNET LIN
Transceiver Cable
The NI-XNET LIN Transceiver Cable connects to a host device
with an active latching connector. To connect the NI-XNET LIN
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 LIN Transceiver Cable, push the lock ejector forward to
disengage the latch and simultaneously pull the NI-XNET LIN
Transceiver Cable, as shown in Figure 3.
Transceiver
Isolation
Barrier
To LIN Bus
To Transceiver
Cable Host