ESD electronic CAN-USB/2 Hardware Installation And Technical Data

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Installation and technical Data CAN-USB/2 Rev. 1.0

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Vahrenwalder Str. 207 • 30165 Hannover • Germany

www.esd-electronics.com • Fax: 0511/37 29 8-68

Phone: 0511/37 29 80 • International: +49-5 11-37 29 80

CAN-USB/2

USB 2.0-CAN-Interface

Hardware Installation

and

technical Data

to Product C.2066.xx

Installation and technical Data CAN-USB/2 Rev. 1.0

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. esd reserves the right to make changes without notice to this, or any of its products, to improve reliability, performance or design.

esd assumes no responsibility for the use of any circuitry other than circuitry which is part of a product of esd gmbh.

esd does not convey to the purchaser of the product described herein any license under the patent rights of esd gmbh nor the rights of others.

esd electronic system design gmbh

Vahrenwalder Str. 207 30165 Hannover Germany

Phone: +49-511-372 98-0 Fax: +49-511-372 98-68 E-mail: info@esd-electronics.com Internet: www.esd-electronics.com

USA / Canada: esd electronics Inc.

525 Bernardston Road Suite 1 Greenfield, MA 01301 USA

Phone: +1-800-732-8006 Fax: +1-800-732-8093 E-mail: us-sales@esd-electronics.com Internet: www.esd-electronics.us

Installation and technical Data CAN-USB/2 Rev. 1.0

Document file:

I:\texte\Doku\MANUALS\CAN\USB-2\Englisch\USB-2_01.en9

Date of print:

22.06.2006

PCB version:

CAN-USB/2 Rev. 1.2

Changes in chapters

The changes in the document listed below affect changes in the hardware as well as changes in the description of facts only.

Chapter Changes versus previous version

- First issue

Technical details are subject to change without further notice.

Installation and technical Data CAN-USB/2 Rev. 1.0

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Installation and technical Data CAN-USB/2 Rev. 1.0

Content

1. Overview .................................................................3

1.1 Module Description....................................................... 3

1.2 Case View with LED and Connector Description................................. 4

1.3 LED-Displays ...........................................................5

2. Hardware Installation .......................................................6

3. Summary of technical Data ...................................................7

3.1 General technical Data..................................................... 7

3.2 USB-Interface and Microcontroller ...........................................7

3.3 CAN Interface........................................................... 8

3.4 Software Support ........................................................8

3.5 Order Information ....................................................... 9

4. Connector Assignment ..................................................... 10

4.1 CAN Interface at DSUB9 Connector ......................................... 10

4.2 USB-Socket ........................................................... 11

5. Correctly Wiring Electrically Isolated CAN Networks ............................ 12

6. CAN-Bus Troubleshooting Guide ............................................. 16

6.1 Termination ........................................................... 16

6.2 CAN_H/CAN_L Voltage ................................................. 17

6.3 Ground ...............................................................17

6.4 CAN Transceiver Resistance Test ........................................... 18

Installation and technical Data CAN-USB/2 Rev. 1.0

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Overview

Installation and technical Data

CAN-USB/2

Rev. 1.0

+5 V=

Physical

CAN

Layer

C A N B U S

CAN

ARM

LPC 2292

CAN

16 kB RAM

256 kB Flash

USB Controller

LEDs

Digital

Isolator

Electrical Isolation

DC/DC

Converter

DSUB9

CiA pinning

Power

Supply

5 V(DC)

USB-

Connector

1. Overview

1.1 Module Description

Figure 1.1:

Block-circuit diagram of CAN-USB/2 module

The CAN-USB/2 module is an intelligent CAN interface with an ARM LPC2292 micro controller for local CAN data management. The module supports the USB 2.0 Hi-Speed interface with data transfer rates of 480 Mbit/s.

The ISO 11898-compliant CAN interface allows a maximum data transfer rate of 1 Mbit/s. Like many other features of CAN interfaces, the bit rate can be set by means of software. CAN interface and other voltage potentials are electrically isolated by means of a digital isolater and DC/DC converters.

The supply voltage is fed via the USB bus. The module is equipped with four green LEDs in the front panel which indicate the current module status.

Overview

Installation and technical Data

CAN-USB/2

Rev. 1.0

1.2 Case View with LED and Connector Description

Figure 1.2.1:

CAN Interface and LEDs

ure 1.2.2:

USB Interface

Overview

Installation and technical Data

CAN-USB/2

Rev. 1.0

1.3 LED-Displays

LED NAME Status Description

LED300D USB on USB module is enumerated

(a node-ID is assigned to the USB module)

short-time switch off

the module receives data from USB bus or sends data on USB bus

LED300C Power on module is in operation,

the 5 V power supply is applied to the module

LED300B CAN flashes data is received or send on the CAN bus

LED300A OK on CAN interface is initialized, bit rates are set

off CAN Error occurred

Table 1.3:

Description of LED display

Installation

Installation and technical Data

CAN-USB/2

Rev. 1.0

2. Hardware Installation

Installation procedure:

1. Switch off the PC and all connected peripheral devices (monitor, printer, etc.). Additionally, switch off all other CAN devices to whose network the CAN module is to be connected in this procedure.

2. Connect the CAN-USB/2-module with the USB bus of the PC.

3. Connect the CAN bus to the 9-pin male DSUB connector. Please remember that the CAN bus has to be terminated at both ends.

esd

offers T-connectors and terminators. Additionally, the CAN-GND-signal has to be grounded at exactly one point in the CAN network. Therefore the CAN termination connectors have got a grounding contact. A CAN device whose CAN interface is not electrically isolated corresponds to the grounding of the CANGND.

4. Connect your PC to mains again.

5. Switch on the PC, the peripheral devices and the other CAN bus devices.

6. End of hardware installation.

Note:

The software installation is described in the manual ‘CAN-API, Installation Guide’.

Technical Data

Installation and technical Data

CAN-USB/2

Rev. 1.0

3. Summary of technical Data

3.1 General technical Data

Temperature range 0...50C ambient temperature

Humidity 90 %, non-condensing

Power supply

via USB 2.0 bus, nominal voltage: 5 V current consumption: max. 250 mA *

Connectors

X210 (DSUB9/male) - CAN bus X300 (USB socket, series B) - USB bus X200 (intern) - Service interface

Case dimensions 55 mm x 55 mm x 25 mm

IP-rating IP 40

Weight 70 g

Table 3.1:

General Data of CAN-USB/2-Module

* Note:

Please note that the current consumption of the module of 250 mA has to be supplied (high powered bus-powered device). The maximum current consumption of 250 mA has to be guaranteed also if a hub is used. Therefore it is highly recommended to use a self-powered hub.

3.2 USB-Interface and Microcontroller

USB controller PLX NET2272

USB-interface USB 2.0, bitrate up to 480 Mbit/s

Microcontroller ARM LPC 2292

Memory

3 k x 16 bit SRAM, 64 k x 16 bit flash EPROM

Table 3.2:

USB interface and microcontroller

Technical Data

Installation and technical Data

CAN-USB/2

Rev. 1.0

3.3 CAN Interface

Number of CAN interfaces 1x CAN

CAN controller LPC2292

CAN protocol Basic-CAN 2.0A/B

Physical Layer

according to ISO 11898, transmission rate programmable from 10 Kbit/s to 1 Mbit/s

Bus termination has to be set externally

Electrical isolation of CANinterfaces from other units

via digital isolators and DC/DC converters

Table 3.3:

Data of CAN interface

3.4 Software Support

For CAN-USB/2 drivers for Windows and Linux are available.

Technical Data

Installation and technical Data

CAN-USB/2

Rev. 1.0

3.5 Order Information

Type Features Order No.

CAN-USB/2 1 x CAN 2.0A/B, ISO 11898, USB 2.0 C.2066.02

CAN-DRV-LCD Object-Licence for Windows and Linux C.1101.02

CAN-USB/2-Co CANopen master/slave object licence C.2066.12

CAN-USB/2-ME User manual in English.

1*)

C.2066.21

CAN-API-ME CAN-API manual in English to C.1101.02

1*)

C.2001.21

CAN-USB/2-ENG

Engineering manual in English

2*)

Content: Circuit diagrams, PCB top overlay drawing, data sheets of significant components

C.2066.25

1*) If ordered together with the module, the manual is included in the shipment. 2*) This manual is liable for costs, please contact our support.

Table 3.5:

Order information

Installation and technical Data CAN-USB/2 Rev. 1.0

Connector Assignment

4. Connector Assignment

4.1 CAN Interface at DSUB9 Connector

The connector is a 9-pin male DSUB connector.

Pin Position:

Pin Assignment:

Signal Pin Signal

1 reserved

(CAN_GND) 6

2CAN_L

CAN_H 7

3 CAN_GND

reserved 8

4 reserved

reserved 9

5Shield

9-pin DSUB connector

Signal description:

CAN_L, CAN_H... CAN signal lines

CAN_GND ... reference potential of local CAN physical layer

(CAN_GND) ... optional reference potential of local CAN physical layer

Shield... Shielding (connected with case of 9-pin DSUB connector)

reserved ... reserved for future applications

Installation and technical Data CAN-USB/2 Rev. 1.0

Connector assignment

4.2 USB-Socket

Attention: The module may only be operated at USB nets with USB interface version numbers



1.1-interface!

However, note that using versions earlier than 2.0 reduces the data transfer rate.

Pin position:

Pin Assignment:

Pin Signal

BUS

2D-

3D+

4 GND

Shell Shield

USB socket (series B)

Wiring

Installation and technical Data

CAN-USB/2

Rev. 1.0

4 5 6 7

2 3

4 5 6 7

2 3

CAN_L

CAN_H

CAN_GND

Shielded wire with

transposed wires

CAN_L

CAN_H

CAN_GND

(at wire shield)

120 Ohm

earth (PE)

Wire structure Signal assignment of wire and connection of earthing and terminator

n.c.

n.c. = not conne cted

DSUB9 conn ector

(female or male)

pin designation

connector case connector case

DSUB9 conn ector

(female or male)

pin designation

CAN wire with connectors

5. Correctly Wiring Electrically Isolated CAN Networks

Generally all instructions applying for wiring regarding an electromagnetic compatible installation, wiring, cross sections of wires, material to be used, minimum distances, lightning protection, etc. have to be followed.

The following

general rules

for the CAN wiring must be followed:

A CAN net must not branch (exception: short dead-end feeders) and has to be terminated by the wave impedance of the wire (generally 120 W ±10%) at both ends (between the signals CAN

L and CAN_H and not at GND)!

A CAN data wire requires two twisted wires and a wire to conduct the reference potential (CAN

GND)!

For this the shield of the wire should be used!

The reference potential CAN_GND has to be connected to the earth potential (PE) at one point. Exactly one connection to earth has to be established!

The bit rate has to be adapted to the wire length.

Dead-end feeders have to kept as short as possible (l < 0.3 m)!

When using double shielded wires the external shield has to be connected to the earth potential (PE) at one point. There must be not more than one connection to earth.

A suitable type of wire (wave impedance ca. 120 : ±10%) has to be used and the voltage loss in the wire has to be considered!

CAN wires should not be laid directly next to disturbing sources. If this cannot be avoided, double shielded wires are preferable.

Figure:

Structure and connection of wire

Wiring

Installation and technical Data CAN-USB/2 Rev. 1.0

l < 0,3 m

CAN_L

CAN_GND

CAN_H

l < 0,3 m

CAN-CBM-

AI4

CAN-CBM-

COM1

CAN-CBM-

DIO8

l < 0,3 ml < 0,3 ml < 0,3 m

Female Co nnector

Male Connector

e.g. CAN-SPS Interface CSC595/2 or CAN-PC Board

Terminator

Male Terminator (Order-no.: C.1302.01)

Connecting CAN_GND to Protective Conductor PE

Terminator with PE Connector

Female Terminator (Order-no.: C.1301.01)

T-Connector

C.1311.03

CAN-Cable Order-no.: C.1323.03

Net 2

Net 1

e.g. PCI/405,

CAN-USB,

VME-CAN2, etc .

CAN-Cable Order-no.: C.1323.03

T-Connector

C.1311.03

T-Connector

C.1311.03

T-Connector

C.1311.03

CAN-Board

T-Connector Order-no.: C.1311.03

Cablin



for devices which have only one CAN connector per net use T-connector and dead-end feeder (shorter than 0.3 m) (available as accessory)

Figure: Example for correct wiring (when using single shielded wires)

Terminal Resistance



use external terminator, because this can later be found again more easily!



9-pin DSUB-terminator with male and female contacts and earth terminal are available as accessories

Earthin



CAN_GND has to be conducted in the CAN wire, because the individual esd modules are electrically isolated from each other!



CAN_GND has to be connected to the earth potential (PE) at exactly one point in the net!



each CAN user without electrically isolated interface works as an earthing, therefore: do not connect more than one user without potential separation!



Earthing CAN e.g. be made at a connector

Wiring

Installation and technical Data

CAN-USB/2

Rev. 1.0

Wire Length



Optical couplers are delaying the CAN signals. By using fast optical couplers and testing each board at 1 Mbit/s, however, esd CAN guarantee a reachable length of 37 m at 1 Mbit/s for most esd CAN modules within a closed net without impedance disturbances like e.g. longer dead-end feeders. (Exception: CAN-CBM-DIO8, -AI4 and AO4 (these modules work only up to 10 m with 1 Mbit/s))

Bit rate

[Kbit/s]

Typical values of reachable

wire length

with esd

interface

max

[m]

CiA recommendations

(07/95) for reachable wire

lengths l

min

[m]

1000

800

666.6 500

333.3 250 166 125 100

66.6 50

33.3 20

12.5 10

37 59

80 130 180 270 420 570 710

1000 1400 2000 3600 5400 7300

25 50

100

250

500 650

1000

2500

5000

Table:

Reachable wire lengths depending on the bit rate when using esd-CAN interfaces

Wiring

Installation and technical Data CAN-USB/2 Rev. 1.0

Examples for CAN Wires

Manufacturer Type of wire

U.I. LAPP GmbH Schulze-Delitzsch-Straße 25 70565 Stuttgart Germany

www.lappkabel.de

e.g. UNITRONIC ®-BUS CAN UL/CSA (UL/CSA approved) UNITRONIC ®-BUS-FD P CAN UL/CSA (UL/CSA approved)

ConCab GmbH Äußerer Eichwald 74535 Mainhardt Germany

www.concab.de

e.g. BUS-PVC-C (1 x 2 x 0.22 mm²) Order No.: 93 022 016 (UL appr.) BUS-Schleppflex-PUR-C (1 x 2 x 0.25 mm²) Order No.: 94 025 016 (UL appr.)

SAB Bröckskes GmbH&Co. KG Grefrather Straße 204-212b 41749 Viersen Germany

www.sab-brockskes.de

e.g. SABIX

CB 620 (1 x 2 x 0.25 mm²) Order No.: 56202251

CB 627 (1 x 2 x 0.25 mm²) Order No.: 06272251 (UL appr.)

Note: Completely configured CAN wires can be ordered from esd.

CAN-Bus Troubleshooting Guide

Installation and technical Data

CAN-USB/2

Rev. 1.0

120

CAN_H

CAN_GND

CAN_L

CAN_H

CAN_GND

120

6. CAN-Bus Troubleshooting Guide

The CAN-Bus Troubleshooting Guide is a guide to find and eliminate the most frequent hardware-error causes in the wiring of CAN-networks.

Figure:

Simplified diagram of a CAN network

6.1 Termination

The termination is used to match impedance of a node to the impedance of the transmission line being used. When impedance is mismatched, the transmitted signal is not completely absorbed by the load and a portion is reflected back into the transmission line. If the source, transmission line and load impedance are equal these reflections are eliminated. This test measures the series resistance of the CAN data pair conductors and the attached terminating resistors.

To test it, please

1. Turn off all power supplies of the attached CAN nodes.

2. Measure the DC resistance between CAN_H and CAN_L at the middle and ends of the network (see figure above).

The measured value should be between 50 and 70



. The measured value should be nearly the same

at each point of the network.

If the value is below 50



, please make sure that:

- there is no short circuit between CAN_H and CAN_L wiring

- there are not more than two terminating resistors

- the nodes do not have faulty transceivers.

If the value is higher than 70



, please make sure that:

- there are no open circuits in CAN_H or CAN_L wiring

- your bus system has two terminating resistors (one at each end) and that they are 120  each.

CAN-Bus Troubleshooting Guide

Installation and technical Data CAN-USB/2 Rev. 1.0

6.2 CAN_H/CAN_L Voltage

Each node contains a CAN transceiver that outputs differential signals. When the network communication is idle the CAN_H and CAN_L voltages are approximately 2.5 volts. Faulty transceivers can cause the idle voltages to vary and disrupt network communication.

To test for faulty transceivers, please

1. Turn on all supplies.

2. Stop all network communication.

3. Measure the DC voltage between CAN_H and GND (see figure above).

4. Measure the DC voltage between CAN_L and GND (see figure above).

Normally the voltage should be between 2.0 V and 4.0 V. If it is lower than 2.0 V or higher than 4.0 V, it is possible that one or more nodes have faulty transceivers. For a voltage lower than 2.0 V please check CAN_H and CAN_L conductors for continuity. For a voltage higher than 4.0 V, please check for excessive voltage.

To find the node with a faulty transceiver please test the CAN transceiver resistance (see next page).

6.3 Ground

The shield of the CAN network has to be grounded at only one location. This test will indicate if the shielding is grounded in several places.

To test it, please

1. Disconnect the shield wire from the ground.

2. Measure the DC resistance between Shield and ground.

3. Connect Shield wire to ground.

The resistance should be higher than 1 M . If it is lower, please search for additional grounding of the shield wires.

CAN-Bus Troubleshooting Guide

Installation and technical Data

CAN-USB/2

Rev. 1.0

CAN_H

CAN_GND

CAN_L

Power

CAN-

Transceiver

Disconnect Power !

Disconnect

CAN !

CAN-node

6.4 CAN Transceiver Resistance Test

CAN transceivers have one circuit that controls CAN_H and another circuit that controls CAN_L. Experience has shown that electrical damage to one or both of the circuits may increase the leakage current in these circuits.

To measure the current leakage through the CAN circuits, please use an resistance measuring device and:

1. Disconnect the node from the network. Leave the node unpowered (see figure below).

2. Measure the DC resistance between CAN_H and CAN_GND (see figure below).

3. Measure the DC resistance between CAN_L and CAN_GND (see figure below).

Normally the resistance should be between 1 M  and 4 M  or higher. If it is lower than this range, the CAN transceiver is probably faulty.

ure:

Simplified diagram of a CAN node

ESD electronic CAN-USB/2 Hardware Installation And Technical Data

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