ESD CAN-PCI/405 User manual

CAN-PCI/405
PCI-CAN Interface
Hardware Manual
to Product C.2023.05, C.2023.07
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 1 of 28
esd electronic system design gmbh
Vahrenwalder Str. 207 • 30165 Hannover • ermany
http://www.esd.eu
Phone: [phone] • Fax: [phone]

N O T E
The information in this document has been carefully checked and is believed to be entirely reliable.
esd makes no warranty of any kind with regard to the material in this document, and assumes no
responsibility for any errors that may appear in this document. In particular descriptions and
technical data specified in this document may not be constituted to be guaranteed product features
in any legal sense.
esd reserves the right to make changes without notice to this, or any of its products, to improve
reliability, performance or design.
All rights to this documentation are reserved by esd. Distribution to third parties, and reproduction
of this document in any form, whole or in part, are subject to esd's written approval.
© 2014 esd electronic system design gmbh, Hannover
esd electronic system design gmbh
Vahrenwalder Str. 207
30165 Hannover
Germany
Phone [phone]
Fax [phone]
E-Mail [email protected]
Internet www.esd.eu
Trademark Notices
CANopen® and CiA® are registered community trademarks of CAN in Automation e.V.
Windows is a registered trademark of Microsoft Corporation in the United States and other countries.
The PICMG® name and logo are registered trademarks of the PCI Industrial Computer Manufacturers Group.
All other trademarks, product names, company names or company logos used in this manual are reserved by their
respective owners.
Page 2 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Document file: I \Texte\Doku\MANUALS\CAN\PCI\405\Englisch\CAN-PCI405_Hardware_en_13.odt
Date of rint: 2014-06-25
Document ty e
number: DOC0800
Hardware version: CAN-PCI/405 Rev.1.4
Document History
The changes in the document listed below affect changes in the hardware as well as changes in
the description of the facts, only.
Revision Cha ter Changes versus revious version Date
1.2
- Safety notes inserted
2010-12-01
1Sentences concerning optional NVRAM and customer application deleted,
new block diagram
2 Hardware installation revised
2.2 Description of debug interface and serial interface removed,
description of CAN2, CAN3 interface corrected
2.4 4 CAN interfaces on CAN-PCI/405-4, not optional
3.2 Description of options removed
3.4 Chapter revised
3.5 Sentence removed
3.6 Order no. of CAN-PCI/405-2 and CAN-PCI/405-4 changed
4.3 Interfaces CAN2, CAN3 only on CAN-PCI/405-4, not optional
4.4, 4.5 Description of debug interface and serial interface removed
- Declaration of Conformity inserted
1.3
- Safety Instructions revised
2014-06-25
- Option DeviceNet is dropped
3.4 Entry 'Electrical isolation' revised
3.5 Chapter updated
7. Declaration of Conformity updated
8. Chapter 'Order Information' moved and revised
Technical details are subject to change without further notice.
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 3 of 28

Safety Instructions
● When working with CAN-PCI/405 follow the instructions below and read the manual carefully to protect yourself from
injury and the CAN-PCI/405 from damage.
● The device is a built-in component. It is essential to ensure that the device is mounted in a way that cannot lead to
endangering or injury of persons or damage to objects.
● The device has to be securely installed in the control cabinet before commissioning.
● Protect the CAN-PCI/405 from dust, moisture and steam.
● Protect the CAN-PCI/405 from shocks and vibrations.
● The CAN-PCI/405 may become warm during normal use. Always allow adequate ventilation around the CAN-PCI/405
and use care when handling.
● Do not operate the CAN-PCI/405 adjacent to heat sources and do not expose it to unnecessary thermal radiation.
Ensure an ambient temperature as specified in the technical data.
● Do not use damaged or defective cables to connect the CAN-PCI/405 and follow the CAN wiring hints in chapter
"Correctly Wiring Electrically Isolated CAN Networks".
● In case of damages to the device, which might affect safety, appropriate and immediate measures must be taken, that
exclude an endangerment of persons and objects.
● Current circuits which are connected to the device have to be sufficiently protected against hazardous voltage (SELV
according to EN 60950-1).
● The CAN-PCI/405 may only be driven by power supply current circuits, that are contact protected.
A power supply, that provides a safety extra-low voltage (SELV or PELV) according to EN 60950-1, complies with this
conditions.
Attention !
Electrostatic discharges may cause damage to electronic com onents.
To avoid this, please perform the steps described on page 7 before you touch the CAN-PCI/405,
in order to discharge the static electricity from your body.
Qualified Personal
This documentation is directed exclusively towards personal qualified in control and automation engineering.
The installation and commissioning of the product may only be carried out by qualified personal, which is authorized to
put devices, systems and electric circuits into operation according to the applicable national standards of safety
engineering.
Conformity
The CAN-PCI/405 meets the demands of the EU regulations and EMC standards printed in the conformity declaration at
the end of this manual.
Intended Use
The intended use of the CAN-PCI/405 is the operation as a PCI-CAN interface board.
The guarantee given by esd does not cover damages which result from improper use, usage not in accordance with
regulations or disregard of safety instructions and warnings.
● The CAN-PCI/405 is intended for installation in PCI-systems only.
● The operation of the CAN-PCI/405 in hazardous areas, or areas exposed to potentially explosive materials is not
permitted.
● The operation of the CAN-PCI/405 for medical purposes is prohibited.
Service Note
The CAN-PCI/405 does not contain any parts that require maintenance by the user. The CAN-PCI/405 does not require
any manual configuration of the hardware.
Dis osal
Devices which have become defective in the long run have to be disposed in an appropriate way or have to be returned
to the manufacturer for proper disposal. Please, make a contribution to environmental protection.
Page 4 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Table of contents
1. Overview......................................................................................................................................6
1.1 Module Description................................................................................................................6
2. Hardware Installation....................................................................................................................7
2.1 Procedure..............................................................................................................................7
2.2 PCB View with Connectors....................................................................................................9
2.3 LEDs and Connectors in the Slot Cover...............................................................................10
2.4 CAN-PCI/405-4 Version with 4 CAN Interfaces....................................................................11
3. Technical Data............................................................................................................................12
3.1 General Technical Data........................................................................................................12
3.2 Microprocessor and Memory................................................................................................12
3.3 PCI Bus................................................................................................................................13
3.4 CAN Interface......................................................................................................................13
3.5 Software Support.................................................................................................................14
4. Connector Assignments..............................................................................................................15
4.1 CAN Interface at DSUB9 Connector....................................................................................15
4.2 Connection to Adapter Board (CAN-PCI/405-4 only)...........................................................16
5. Correctly Wiring Electrically Isolated CAN Networks..................................................................17
5.1 Light Industrial Environment (Single Twisted Pair Cable).....................................................17
5.1.1 General Rules.............................................................................................................17
5.1.2 Cabling........................................................................................................................18
5.1.3 Termination..................................................................................................................18
5.2 Heavy Industrial Environment (Double Twisted Pair Cable).................................................19
5.2.1 General Rules.............................................................................................................19
5.2.2 Device Cabling............................................................................................................20
5.2.3 Termination..................................................................................................................20
5.3 Electrical Grounding.............................................................................................................21
5.4 Bus Length...........................................................................................................................21
5.5 Examples for CAN Cables...................................................................................................22
5.5.1 Cable for Light Industrial Environment Applications (Two-Wire)..................................22
5.5.2 Cable for Heavy Industrial Environment Applications (Four-Wire)...............................22
6. CAN Troubleshooting Guide.......................................................................................................23
6.1 Termination..........................................................................................................................23
6.2 Electrical Grounding.............................................................................................................24
6.3 Short Circuit in CAN Wiring..................................................................................................24
6.4 CAN_H/CAN_L-Voltage ......................................................................................................24
6.5 CAN Transceiver Resistance Test .......................................................................................25
7. Declaration of Conformity...........................................................................................................26
8. Order Information.......................................................................................................................27
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 5 of 28

Overview
1. Overview
1.1 Module Descri tion
Figure 1: Block circuit diagram
The CAN-PCI/405 is a PC board designed for the PCI bus that supports up to four independent
CAN interfaces. In the CAN-PCI/405-2 version two interfaces are placed directly on the board.
Furthermore, in the CAN-PCI/405-4 version two additional interfaces are placed on an adapter
board.
The IBM PowerPC 405GP with 200 MHz enables a performance of up to 375 MIPS. The board is
equipped with 16 Mbyte SDRAM and 1 Mbyte Flash.
The CAN-PCI/405 produces hardware-generated timestamps with a resolution of 1 μs for all CAN
messages.
The CAN-PCI/405-2 provides two and the CAN-PCI/405-4 four ISO 11898 compliant CAN
interfaces based on SJA1000 CAN controllers. The CAN interfaces allow a data transfer rate of 1
Mbit/s. The interfaces are electrically isolated from the other potentials.
Page 6 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405
Flash
CAN Controller
SJA1000
CAN Controller
SJA1000
CAN Controller
SJA1000
CAN Controller
SJA1000
C
A
N
B
U
S
DC/DC
Converter
Physical
CAN
Layer
C
A
N
B
U
S
DC/DC
Converter
Physical
CAN
Layer
CAN2
CAN3
Adapter Board
CAN0
CAN1
PCI Card Ed e Connector
AMCC
PPC405
FPGA
Control Lo ic
SDRAM
10-pole
post connector
CAN-adapter board
Electrical Isolation
Electrical Isolation
Ribbon
Cable
DSUB9
CiA pinnin
DSUB9
CiA pinnin
CAN-PCI/405-4 only

Hardware Installation
2. Hardware Installation
2.1 Procedure
Read the safety instructions at the beginning of this document carefully, before
you start with the hardware installation!
Danger!
Electric shock risk. Never carry out work while power supply voltage is switched on!
Attention !
Electrostatic discharges may cause damage to electronic components. To avoid this,
please perform the following steps before you touch the module, in order to discharge
the static electricity from your body
→
→
→
Switch off the power of your PC, but leave it connected to the mains until you
have discharged yourself.
Please touch the metal case of the PC now to discharge yourself.
Furthermore, you must avoid contact between your clothes and the CAN-PCI/405.
Procedure:
1. Switch off your computer and all connected peripheral devices (monitor, printer, etc.). Switch
off the CAN devices of the net to which the CAN module is to be connected.
2. Discharge your body as described above.
3. Disconnect the power supply of the PC from the mains.
If the computer does not have a flexible mains cable, but is directly connected to mains,
disconnect the power supply via the safety fuse and make sure that the fuse cannot switch
on again unintentionally (i.e. with caution label).
Danger!
Never carry out work while power supply voltage is switched on!
4. Remove the PC cover.
For further information on this see the manual of your PC.
5. Select an open PCI slot and remove the slot cover of the PC.
The CAN module can be inserted into every PCI slot. Be careful not to insert the board into a
slot of another slot type, because this might damage the PC and the board!
6. Insert the CAN module into the selected PCI slot.
Carefully push the board down until it snaps into place.
7. Attach the board.
8. If you are installing the CAN-PCI/405-4 module with 4 CAN interfaces you have to install the
adapter board in the PCI slot next to the CAN-PCI/405. Connect the two boards with the
included ribbon cable. The cable connectors are reverse-connect protected.
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 7 of 28

Hardware Installation
9. Replace the PC cover.
10. Connect the CAN wire.
Please note that the CAN bus has to be terminated at both ends! esd offers special T-
connectors and terminator connectors. Additionally the CAN_GND signal has to be
connected to earth at exactly one point. For easier wiring the termination connectors are
equipped with an earth connector (4.8 mm fast-on, male).
A CAN participant without an electrically isolated interface acts as an earth connection.
The first CAN interface (CAN0) has to be connected via the lower DSUB connector (X1000)
and the second CAN interface (CAN1) has to be connected via the upper DSUB connector
(X1010) of the CAN-PCI/405.
If you are installing a CAN-PCI/405-4 with four CAN interfaces, you have to connect the third
CAN interface (CAN2) via the lower DSUB connector of the adapter board and the fourth
CAN interface (CAN3) via the upper DSUB connector of the adapter board. You will find a
figure showing the connectors on page 11.
11. Reconnect the power supply of the PC.
12. Switch on the PC, the peripheral devices and the other CAN participants in any order.
13. End of hardware installation.
Page 8 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Hardware Installation
2.2 PCB View with Connectors
Figure 2: PCB top view of CAN-PCI/405-2
See also page 15 for signal assignment of the CAN connectors.
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 9 of 28

Hardware Installation
2.3 LEDs and Connectors in the Slot Cover
Figure 3: Connectors and LEDs
LED Function Descri tion of LED (on)
ACAN1-,
CAN3-traffic
CAN-PCI/405-2
CAN-PCI/405-4
CAN-frames are being received or transmitted on CAN1
CAN-frames are being received or transmitted on CAN1
and/or CAN3
BCAN0-,
CAN2-traffic
CAN-PCI/405-2
CAN-PCI/405-4
CAN-frames are being received or transmitted on CAN0
CAN-frames are being received or transmitted on CAN0
and/or CAN2
CDriver
status
LED off
LED on
LED flickering
No driver loaded
Driver loaded
Communication with CAN-board
DLocal CPU
RUN
Local CPU is in RUN status
(LED lights at every access to the SDRAM, therefore the LED can be
blinking or permanently on in normal operation)
Page 10 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Hardware Installation
2.4 CAN-PCI/405-4 Version with 4 CAN Interfaces
In the CAN-PCI/405-4 version, the board is equipped with four CAN interfaces.
This module type is equipped with two additional SJA1000 CAN controllers. The physical layer of
the additional CAN nets is placed at a separate adapter board. The adapter board has to be
mounted close to the CAN-PCI/405 and has to be connected via the ribbon cable that is contained
in the scope of delivery.
The additional physical interfaces CAN2 and CAN3 are designed identical to the physical
interfaces of CAN0 and CAN1.
The four-CAN version CAN-PCI/405-4 has the order number C.2023.07
It is not possible to connect the adapter board to a CAN-PCI/405-2 (order no. C.2023.05).
Figure 4: Connection of the adapter board
via ribbon cable
Figure 5: CAN channel assignment to
the connectors
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 11 of 28

Technical Data
3. Technical Data
3.1 General Technical Data
Power supply
voltage
supplied by PCI bus,
nominal voltage 5 V ±5%,
3.3 V ±5%,
typical current consumption for 2x CAN (max., at 20°C)
0,62 A at 3,3 V
0,13 A at 5 V
Connectors
PCI bus
CAN0
CAN1
- card edge (X100)
- DSUB9/male (X1000)
- DSUB9/male ( X1010)
The following connectors are only equipped for programming and service
debug interface
serial interface (TTL)
- 10-pole SMD female con. (X720)
- 6-pole post connector (X710)
CAN-PCI/405-4 only
Connector to adapter board for CAN net 2 and CAN net 3
- 10-pole post connector (X1100)
The following connectors are on the adapter board
CAN2
CAN3
- DSUB9/male (P130)
- DSUB9/male (P170)
Connector on the adapter board for the connection of the
CAN-PCI/405-4 via ribbon cable
- 10-pin post connector ( X100)
Temperature
range 0...50 °C ambient temperature
Humidity max. 90%, non-condensing
Dimensions 164.64 mm x 106.68 mm (without slot cover panel and CAN connectors)
Weight <200 g
Table 1: General data of the module
3.2 Micro rocessor and Memory
CPU PowerPC 405GP, 200 MHz, 32 bit
Flash 1 MB Flash
SDRAM 4 M x 32 bit SDRAM (16 Mbyte)
Table 2: Microprocessor and memory
Page 12 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Technical Data
3.3 PCI Bus
Host bus PCI in compliance with PCI Local Bus Spec. 2.2
PCI data bus 32 bit
Controller PPC405GP
Interrupt interrupt signal A
Slot position no restrictions for the slot position
Board dimension PCI short card
Connector PCI card edge connector
Table 3: PCI bus data
3.4 CAN Interface
Number of CAN
interfaces
CAN-PCI/405-2 2
CAN-PCI/405-4 4
(2 and 2 additional CAN interfaces at adapter board)
CAN controller SJA1000, acc. to ISO 11898-1 (CAN 2.0 A/B)
Physical Layer Physical layer according to ISO 11898-2,
transmission rate is programmable from 10 Kbit/s to 1 Mbit/s
Bus termination terminating resistor has to be set externally, if required
Electrical isolation
of the CAN
interface against
other units
both CAN interfaces are electrically isolated via optocouplers and DC/DC-
converters against each other and against the PCI bus potentials
Table 4: Data of the CAN interface
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 13 of 28

Technical Data
3.5 Software Su ort
Device drivers for Windows® and Linux® and real-time operating systems are available (see 'Order
Information', page 27).
The CANopen software package is available for Windows, Linux, QNX® and RTX.
J1939 Stack is available as higher layer protocol for Windows, Linux and RTX.
For detailed information about the driver availability for your special operating system, please
contact our sales team [email protected]
Additional free-of-charge esd CAN tools for Windows offer efficient setup and analysis of CAN
applications and networks.
The software installation and the software drivers are described in the manual
NTCAN-API Application Developers Manual
NTCAN-API Driver Installation Guide
esd-order No. C.2001.21
Page 14 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Connector Assignments
4. Connector Assignments
4.1 CAN Interface at DSUB9 Connector
The assignment of the signals to the connector pins is the same for all CAN interfaces. All
connectors are 9-pole DSUBs with male contacts.
CAN-PCI/405-2 and CAN-PCI/405-4 CAN0 (X1000), CAN1 (X1010)
CAN-PCI/405-4 (connectors on the adapter board) CAN2 (P130), CAN3 ( P170)
Device connector: 9-pin DSUB connector, male
Pin Position:
Pin Assignment:
Signal Pin Signal
1
reserved
(CAN_GND)
6
2
CAN_L
CAN_H
7
3
CAN_GND
reserved
8
4
reserved
reserved
9
5
Shield
Signal Descri tion:
CAN_L, CAN_H ... CAN signal lines
CAN_GND ... reference potential of the local CAN physical layer
(CAN-GND)... optional CAN_GND
Shield ... connected to computer case via slot cover panel
reserved ... reserved for future applications, do not connect!
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 15 of 28
12345
6789

Connector Assignments
4.2 Connection to Ada ter Board (CAN-PCI/405-4 only)
The CAN-PCI/405-4 board is equipped with the 10-pole post connector (X1100) for the connection
of the adapter board via a ribbon cable.
The signals of CAN2 and CAN3 are TTL level signals.
Signal Pin Signal
+5V 1 2 Tx0-CAN2*
Tx1-CAN2* 3 4 Rx0-CAN2*
Rx1-CAN2* 5 6 Tx0-CAN3*
Tx1-CAN3* 7 8 Tx0-CAN3*
Rx1-CAN3* 9 10 GND
10-pole post connector
Signal Descri tion:
Tx0-CAN2*, Rx0-CAN2*,
Tx1-CAN2*, Rx1-CAN2*... CAN signals (TTL-level) of the interface CAN2
Tx0-CAN3*, Rx0-CAN3*,
Tx1-CAN3*, Rx1-CAN3*... CAN signals (TTL-level) of the interface CAN3
+5V, GND ... power supply of the adapter board
Page 16 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Correctly Wiring Electrically Isolated CAN Networks
5. Correctly Wiring Electrically Isolated CAN Networks
For the CAN wiring all applicable rules and regulations (EC, DIN), e.g. regarding electromagnetic
compatibility, security distances, cable cross-section or material, have to be met.
5.1 Light Industrial Environment (Single Twisted Pair Cable)
5.1.1 General Rules
Note:
esd grants the EC Conformity of the product, if the CAN wiring is carried out with at
least single shielded single twisted pair cables that match the requirements of ISO
11898-2. Single shielded double twisted pair cable wiring as described in chapter 5.2.
ensures the EC Conformity as well.
The following general rules for CAN wiring with single shielded single twisted pair cable must be
followed
1A cable type with a wave impedance of about 120 Ω ±10% with an adequate wire cross-section
(0.22 mm²) has to be used. The voltage drop over the wire has to be considered!
2For light industrial environment use at least a two-wire CAN cable. Connect
•
•
the two twisted wires to the data signals (CAN_H, CAN_L) and
the cable shield to the reference potential (CAN_GND)!
3The reference potential CAN_GND has to be connected to the functional earth (FE) at exactly one
point.
4A CAN net must not branch (exception short cable stubs) and has to be terminated with the
characteristic impedance of the line (generally 120 Ω ±10%) at both ends (between the signals CAN_L
and CAN_H and not at GND)!
5Keep cable stubs as short as possible (l < 0.3 m)!
6Select a working combination of bit rate and cable length.
7Keep away cables from disturbing sources. If this cannot be avoided, double shielded wires are
recommended.
Figure 6: CAN wiring for light industrial environment
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 17 of 28
CAN GND
CAN_H
CAN_GND
n.c.
n.c.
n.c.
n.c.
CAN_L 1
4
5
6
7
9
2
3
8
9
1
4
5
6
7
3
8
2
earth (FE)
CAN_L
CAN_H
CAN_GND
Single shielded
twisted pair cable
two-wire cable,
1x 2x 0.22mm²)
CAN_GND
(at wire shield)
Wire Layout
Signal assignment of single shielded twisted pair cable
with earth and termination
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c. = not connected
DSUB9 connector
(female or male)
pin designation
connector case connector case
DSUB9 connector
(female or male)
pin designation
AN wire with connectors

Correctly Wiring Electrically Isolated CAN Networks
5.1.2 Cabling
●for devices which have only one CAN connector per net use T-connector and stub (shorter
than 0.3 m) (available as accessory)
Figure 7: Example for proper wiring with single shielded single twisted pair wires
5.1.3 Termination
●If the used CAN interface is not equipped with an integrated CAN termination and it is at an
end of the bus, use external termination plugs.
●9-pin DSUB-termination connectors with male and female contacts and earth terminal are
available as accessories
Page 18 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405

Correctly Wiring Electrically Isolated CAN Networks
5.2 Heavy Industrial Environment (Double Twisted Pair Cable)
5.2.1 General Rules
The following general rules for the CAN wiring with single shielded double twisted pair cable must
be followed
1A cable type with a wave impedance of about 120 Ω ±10% with an adequate wire cross-section
(0.22 mm²) has to be used. The voltage drop over the wire has to be considered!
2For heavy industrial environment use a four-wire CAN cable. Connect
•
•
•
two twisted wires to the data signals (CAN_H, CAN_L) and
the other two twisted wires to the reference potential (CAN_GND) and
the cable shield to functional earth (FE) at least at one point!
3The reference potential CAN_GND has to be connected to the functional earth (FE) at exactly one
point.
4A CAN bus line must not branch (exception short cable stubs) and has to be terminated with the
characteristic impedance of the line (generally 120 Ω ±10%) at both ends (between the signals CAN_L
and CAN_H and not at GND)!
5Keep cable stubs as short as possible (l < 0.3 m)!
6Select a working combination of bit rate and cable length.
7Keep away CAN cables from disturbing sources. If this can not be avoided, double shielded cables are
recommended.
Figure 8: CAN wiring for heavy industrial environment
CAN-PCI/405 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 Page 19 of 28
CAN GND
CAN_L
CAN_H
CAN_GND
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
CAN_L
CAN_H CAN_GND
Shield
CAN_GND
twisted twisted
5
6
7
9
8
1
4
3
2
9
1
4
5
6
7
3
8
2
Single shielded
double twisted pair cable
four-wire cable,
2x 2x 0.22mm²)
wire shield
earth (FE)
Wire Layout
(Example)
Signal assignment of single shielded double twisted pair cable
with earth and termination
n.c. = not connected
DSUB9 connector
(female or male)
pin designation
connector case
DSUB9 connector
(female or male)
pin designation
AN cable with connectors
connector case

Correctly Wiring Electrically Isolated CAN Networks
5.2.2 Device Cabling
●To connect CAN devices which are equipped with one CAN connector per net, use
T-connectors and cable stubs (shorter than 0.3 m).
Attention:
If single shielded double twisted pair cables are used, realize the T-connections by
means of connectors that support connection of two CAN cables at one connector
where the cable’s shield is looped through e.g. DSUB9 connector from ERNI
(ERBIC CAN BUS MAX, order no. 154039).
The usage of esd’s T-connector type C.1311.03 is not recommended for single
shielded double twisted pair cables because the shield potential of the conductive
DSUB housing is not looped through this T-connector type.
Furthermore, mixed use of single twisted and double twisted cables should be
avoided!
Figure 9: Example for proper wiring with single shielded double twisted pair cables
5.2.3 Termination
●If the used CAN interface is not equipped with an integrated CAN termination and it is at an
end of the bus, use external termination plugs.
●A 9-pin DSUB-connector with integrated switchable termination resistor can be ordered e.g.
from ERNI (ERBIC CAN BUS MAX, female contacts, order no. 154039).
Page 20 of 28 Hardware Manual • Doc. No. C.2023.21 / Rev. 1.3 CAN-PCI/405
CAN_L
CAN_GND
CAN_H
FE
esd
CAN Modul
Shield (Abschirmun )
esd
CAN Modul
esd
CAN Modul
CAN_GND connected
to functional earth (FE)
at exactly one point
Net 2
Net 1
e. . CPCI/405,
PMC-CAN/331,
EPPC-405, etc.
CAN-Board
termination
switched OFF
CAN T-Connector
(DSUB9 connector, female),
with switchable
termination
CAN
T-Connector
connected to earth (FE)
via computer housin
termination
switched OFF
CAN
T-Connector
CAN
T-Connector
termination
switched ON
termination
switched ON
Attention:
Watch for the correct position of the
termination switches at the connectors!
CAN
T-Connector