8 devices Korlan USB2CAN User manual

Korlan USB2CAN User Guide
High quality isolated USB to CAN interface
1.0v 2019-04-02

Table of Contents
1 Introduction 4
1.1 Usage warning 4
1.2 Technical specication 4
2 USB2CAN converter 5
2.1 CAN connector pinout 5
2.2 LED indication 6
2.3 CAN bus termination 6
2.4 Testing modes 7
3 Work on Linux 8
3.1 Driver and conguration 8
3.2 Tools-can-utils (send/receive CAN packets) 8
3.3 Tools-dfu-util (USB2CAN Firmware upgrade) 8
3.4 Test code example 9
3.5 Firmware upgrade 9
4 Work on Windows 10
4.1 Windows XP driver installation 10
4.2 Windows 7 driver installation 11
4.3 Windows 8 driver installation 13
4.4 Windows 10 driver installation 15
4.5 USB2CAN test application bus speed conguration 17

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Changes history
Date Change list
2019-04-02 Initial release

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1. Introduction
With Korlan USB2CAN you can monitor a CAN network, write a CAN program and communicate with industrial,
medical, automotive or other CAN based device. It comes in two dierent versions: DB9 or OBD2.
The Korlan CANBUS USB adapter connects a CAN bus to the USB port of any device running Linux or Windows
operating system, which also supplies the power to the adapter (no power supply needed). In the downloads section
now you can nd all the related drivers and software applications and even Windows 7 64-bit kernel driver, which was
added recently.
1.1 Usage warning
Your use of this device must be done with caution and a full understanding of the risks!
This warning is presented to inform you that the operation of this device may be dangerous. Your actions
can inuence the behaviour or a can-based distributed embedded system and depending on the application,
the consequences of your improper actions could cause serious operation malfunction, loss of information,
damage to equipment and physical injury to yourself or others.
1.2 Technical specification
Connectors
Computer USB 2.0 Full speed, Type A connector
CAN D-SUB, 9 pins. CAN-CIA standard interface pin assignment or OBD2, 16 pins.
Standard interface pin assignment.
CAN
Specication ISO 11898-2 High-speed CAN
2.0A (standard format) and 2.0B (extended format)
Bit rates 20, 50, 100, 125, 250, 500, 800, 1000 Kbit/s or user denable
Controller ARM 32bit Cortex-M0 (STM32F072)
Transceiver TI ISO1050
Galvanic isolation Up to 2.5kV, separate for each CAN channel
Termination None
Measures
Size 110 x 36.7 x 16.2 mm (L x W x H), no cable
Weight DB9 version: 100g with cable, OBD2 version: 140g with cable
Environment
Operating temperature From -35ºC to +55ºC
Relative humidity 15-90%, not condensing
Usage Indoor only
Other
Available drivers Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 10, Linux
3rd party ptotocol support Driver for VSCP protocol
Open source CANAL API DLL for Windows
Linux SocketCAN compatible

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2. USB2CAN converter
Pin Signal Description
1 - No connection
2 CANL CANL bus line (dominant low)
3CAN GND CAN Ground
4 - No connection
5CAN_SHLD Connected to CAN GND via 100
Ω /0.1uF
6 CAN GND CAN Ground
7CANH CANH bus line (dominant high)
8- No connection
9 - No connection
Pin number Description
4GND
5GND
6CAN Bus High
14 CAN Bus LOW
Note: All other pins on OBD2 are not used and not connected.
Figure 2-1. DB9 connector Figure 2-2. OBD2 connector
2.1 CAN connector pinout

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2.2 LED indication
Korlan USB2CAN has three LEDs (Power, Error, Info) for device status indication. Device status Indication
modes are listed in the table below.
LED Status description
Only Power LED on Device powered on.
Info LED on, Error LED o There is no driver detected at host device.
Error LED on, Info LED o CAN interface is not enabled on a host device.
Info and Error LED on CAN interface enabled, device is ready to receive or send data.
Error and Info LED blinking CAN send/ receive data.
2.3 CAN bus termination
A High-speed CAN bus (ISO 11898-2) must be terminated on both ends with 120 Ohms.
Standard termination example.
The 120-Ω characteristic impedance twisted-pair cable must be terminated with an impedance of the same
value to minimized reected waves that occur from miss-matched impedances. Bad terminal may cause signal
reections and the transceivers of the connected CAN nodes (CAN- interface, control device) may not work.
The USB2CAN does not have an internal termination. Device must be used on a terminated CAN bus.
1 LED (Power)
3 LED (Info)
2 LED (Error)

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2.4 Testing modes
There are three testing modes supported by Korlan USB2CAN:
•Loopback
•Silent
•Silent loopback
Loopback mode
1Silent mode 2Silent loopback 3
is used to test if the device is
operational when only one device
is available. If Korlan USB2CAN
is in loopback mode, everything
what is sent through the CAN
interface is send back to device.
It is like the CAN interface TX pins
are connected to its RX pins.
means the interface only listens
to the CAN bus. This means the
unit does not even provide an
ACK frame when a message is
placed on the CAN bus correctly.
is self test mode which can be
used in a working CAN system
without interfering with it.

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3. Work on Linux
3.1 Driver and configuration
The Korlan USB2CAN converter is supported by mainline Linux since version 3.9. It works with Linux
distributions like Ubuntu and Debian with no additional driver installation. For older version driver must be
built manually.
Recommended Linux distributions:
•Ubuntu 14.04 or newer
• Debian 8 (Jessie) or newer
If the driver is correctly loaded, CAN interface should be seen when issuing the command sudo ip link.
Set can0 interface speed to 125 Kbps:
sudo ip link set can0 up type can bitrate 125000 sample-point 0.875
Set to can0 to “steady” state (steady green led):
sudo ip link set can0 up
To bring down interface (steady red led):
sudo ip link set can0 down
To get more information about conguration options type:
sudo ip link set can0 type can help
3.2 Tools- can-utils (send/receive CAN packets)
The programs allow to get CAN communications instantly using two commands “cansend” and “candump”.
Command to install tool:
sudo apt-get install can-utils
Send byte of information (0102030405060708) to can device with id = “01010101”:
cansend can0 01010101#0102030405060708
Receive everything on can0 interface:
candump can0
3.3 Tools- dfu-util (USB2CAN Firmware upgrade)
For dfu-util tool is recommended for USB2CAN rmware upgrade. The tool is used to upload rmware from PC to
device over USB. The tool is available for download on 8devices WEB page.

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3.5 Firmware upgrade
Instal dfu-util (>= 0.9)
sudo apt-get install dfu-util
Switch to internal bootloader using the set_dfu utility provided with the rmware:
sudo ./set_dfu
Flash new rmware as root:
sudo dfu-util -a 0 -s 0x8008000 -D USB2CAN-v2.0.bin
3.4 Test code example
Code example is available to download from a WEB (USB2CAN_TEST.py)
Two CAN bus interfaces need to be connected on same computer together (Ex.: connect two USB2CAN
usb ports to a computer and connect can ports together). The code sends random from one interface to
another and checks if the
received data is valid.
To use the code go to terminal and launch command:
python USB2CAN_TEST [can interface 1] [can interface 2] [number of packets] [baudrate]
Example to send 100 random data packets from interface can0 to can1 at a 125 Kbps baudrate:
python USB2CAN_TEST.py can0 can1 100 125000
Testing was done using Ubuntu Linux distribution. Other distributions may require additional conguration.

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4. Work on Windows
4.1 Windows XP driver installation
Download drivers les from 8devices WEB page:
• 32-bit - USB2CAN Windows 32-bit (XP, Vista, Win7, Win8, Win10) USB driver v1.0.2.1
• 64-bit - USB2CAN Windows 64-bit (XP, Vista, Win7, Win8, Win10) USB driver v1.0.2.1
Plug Korlan USB2CAN device to computer USB connection. Info LED should be on, Error LED should be o.
Use Hardware wizard, which will start after You plug device to PC.
It can be started manually by pressing: Start – Control Panel – Add Hardware.
When Hardware wizard starts, choose
“No, not this time” and press next:
Then choose “Install from a list
or specic location”:
1 2
Choose “Search for the best driver in these
locations”, browse for drivers location and
press next:
You will receive warning from Windows.
Choose “Continue Anyway”:
3 4
When installation completed press “Finish”:
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