Frequently Asked Questions

Yes, the Kvaser Blackbird v2, Blackbird Semipro HS and Kvaser Blackbird Semipro HS/HS can all be used in either WLAN mode or in a direct USB-to-CAN mode.

We do not have drivers for Apple Macbooks or desktop computers.  We have drivers for Windows and Linux.  You can run a virtual machine on your Apple computer running Linux or Windows if your machine is based on an Intel x86 or x64 architecture.  This will not currently work with the M1 based Apple computers.

The two virtual channels that comes with the driver installed are connected, working as for example two Leafs connected by a loopback cable.

If you want more virtual channels, or channels not connected, you can use the Add Hardware Wizard to add a second pair. These will be connected to each other, but not to the first pair.

1. Press Windows + R, and type hdwwiz and click OK
2. Click Next, and manual install. Select CAN Hardware (Kvaser) and Next
3. Scroll down to Kvaser Virtual CAN driver, and then Next until it finishes.

You should now have an additional pair of virtual channels ready to use.

The LED Pattern Quick Guide for Kvaser Leaf Light HS v2 and Kvaser Leaf v3 provides information on interpreting the device’s status based on the color and behavior of the LEDs. These LEDs indicate various operational states, see PDF. By observing the LED patterns, users can quickly diagnose the device’s status and troubleshoot issues related to CAN communication or hardware functionality.

LED Pattern Quick Guide

The two virtual channels that comes with the driver installed are connected, working as for example two Leafs connected by a loopback cable.

If you want more virtual channels, or channels not connected, you can use the Add Hardware Wizard to add a second pair. These will be connected to each other, but not to the first pair.

1. Press Windows + R, and type hdwwiz and click OK
2. Click Next, and manual install. Select CAN Hardware (Kvaser) and Next
3. Scroll down to Kvaser Virtual CAN driver, and then Next until it finishes.

You should now have an additional pair of virtual channels ready to use.

To configure the Memorator, Memorator Professional, or Memorator R Semipro, you must have:

1) the Kvaser driver installed, and
2) the Memorator Tools software installed (available on our downloads page).

Using the Memorator Tools software, you can configure your Memorator device.  For a thorough walk-through, watch the instructional video below:

1. Download the latest drivers from www.kvaser.com.
2. Make sure you have administrator privileges on the computer before attempting to run the driver installation.
3. Run the driver installation package
4. Check the optional J2534 support and press Next.
5. Follow remaining dialogs until driver installation is complete.
6. Attach Kvaser hardware to the PC and complete the found new hardware wizard.

Yes, in Kvaser Memorator Config Tool, you could merge multiple log data record by selecting(highlight) the record that you need, then follow the regular steps to extract the data into the log file format you want.

Noted: This feature only works with records that are coming from the original data file in the SD Card(.kmf) format.

The Memorator series of dataloggers does not have a built-in way to perform playback.

In order to playback a stream of recorded CAN messages onto the bus, there are two options:

1.  Extract the recorded data from the Memorator to a desired format.  Then write a software application using our CANlib SDK to play the messages back on the bus using the Memorator Professional or other Kvaser USB to CAN interface (see products).

2. Kvaser also has several Technical Associates (TA’s) whose software supports playback.  This would mean:

a) extracting the data from the Memorator to a format that the TA software supports, then

b) running the TA software to play the data back on to the bus using the Memorator Professional or other Kvaser USB to CAN interface.

TA software can be found on our “Associate Software” page: https://www.kvaser.com/products-services/associate-software/

Use the filters on the right side of the screen to limit the number of applications to only “Bus Analyzers”.  Visit these software pages to confirm the playback feature.

The Kvaser Leaf v3 offers everything you love about the Kvaser Leaf Light v2 with a host of improvements and new features that enhance its performance and compatibility. Let’s dive into what’s been expanded and added in the v3 version. 

Expanded Features 

1. CAN Bit Rate:
   The Kvaser Leaf v3 supports a CAN bit rate range from 20 kbit/s to 1 Mbit/s, with the lowest bit rate reduced from 40 kbit/s.
2. Timestamp Resolution:
   Improved timestamp resolution is at 50 µs compared to the previous 100 µs, providing greater precision.

New Features 

1. CAN FD Support:
   Kvaser Leaf v3 introduces CAN FD functionality, with bit rates of up to 8 Mbit/s, making the Kvaser Leaf v3 well-suited for high-speed applications.
2. Silent Mode:
   With silent mode, you can listen to a CAN bus without transmitting, including avoiding ACKs, perfect for monitoring systems.
3. Increased Message Rate:
   Experience a significant boost in message rate, jumping from 8,000 msg/s to 20,000 msg/s.
4. Hidden Updates:
   This version comes with improved firmware handling that allows for seamless updates in the background.
5. Improved USB Handling:
   Enhanced USB communication for faster data transfer between your software and the Kvaser Leaf v3. 

Circuit Board Version: 

1. The same dimensions:
   The Kvaser Leaf v3 CB (01532-6) shares the same dimensions as the Kvaser Leaf Light HS v2 (00733-8), Mounting hole location remains unchanged, as is the LED position, so the new product is a drop-in replacement for the old product.
2. M3-sized mounting holes:
   Mounting holes have been increased to 3.5mm from 2.54mm, with an increased plating width around the holes to facilitate the use of M3 screws and ensure a robust installation
3. Soldering Options:
   Alternative cables can be soldered to the new Kvaser Leaf v3 CB. The identity of each pin is printed on both sides, to make self-build PC applications easier. 
4. STEP file availability:
   For users who prefer to make their own enclosure, a STEP file is available for download. 

Compatibility and Drivers 

1. Software Compatibility:
   The Kvaser Leaf v3 is fully compatible with the Kvaser Leaf Light v2, so no code changes are required to use it. However, if your software specifically identifies the Kvaser Leaf Light v2 by name or EAN, you will need to update the software to recognize the Kvaser Leaf v3.
2. Driver Update:
   Ensure your drivers are up to date. You will need version 5.41 or later (released after 2023-05-01) for full compatibility with the Kvaser Leaf v3.

Have Questions? 

If you have any technical queries or need further assistance, don’t hesitate to reach out to our support team at SUPPORT@KVASER.COM. 

Error-frames are very rare and in a good system there should be no Error-frames.

Even if you have Error-frames there main cause in a system is a delay of information.

It is better to handle problem on a system level where communication Errors are covered as any other error in a control system.
It should also be noted that in a real time system is one sample error like a small glitch than have very short duration in time and in most cases cannot be recognized.

The best to test a system is to place a test unit between the unit and the CAN-bus. By this test unit it is possible to delay CAN-frames and even remove CAN-frames to check how the system handle loss of information.

By this it is even possible to modify the data to check that the system can handle wrong input data without causing dangerous conditions in the system.

With good cabling there will be no Error-frames to handle.

If you get Error frames it should be registered by date and time.

This will help you to find the reason for the Error-frames.
There is no reason to have a CAN-bus with Error frames and if they occur regular with a certain intensity there is reason to find the cause of the Error-frames and take action to remove the cause of the Error-Frames.

Originally proposed by CiA in 2015, and completely revised in 2019, Signal Improvement Capability (SIC) is a technology to improve the quality of signals sent and received between devices on a CAN FD bus. This is done by suppressing the ringing caused by imperfect network topology. In CAN FD, arbitration ends after the arbitration segment, and the bit rate is no longer limited by arbitration, so it can be increased according to the specification (ISO 11898-1). During the data phase of a CAN FD frame the bit rate is limited by the network topology, and SIC improves the signal to allow a higher bit rate during the data phase.

Ringing is worst when the transmit signal goes from a zero to a one, or after a dominant to recessive transition. SIC can be implemented in the transmitter to suppress the ringing when transmitting, or in the receiver to filter the ringing when receiving. Both implementations enable an increased data bit rate, but they differ slightly in the details. SIC is not usually needed in Classical CAN because the bit rate is limited by arbitration and does not change during the data phase. Since Classical CAN does not increase the bit date after arbitration, SIC is not needed and would not add any benefits.

More information can be found at https://can-cia.org/can-knowledge/can/cia601/ and by downloading the CiA document 601 series: CAN FD guidelines and recommendations.

The Kvaser USBcan Pro 4xCAN Silent is a ‘listen-only’ CAN interface. It is used by developers of highly sensitive autonomous or safety-critical systems to ensure that the interface has no impact on the bus or surrounding systems. It is also selected to prevent any application or third-party, such as a hacker, from impacting the CANbus and its related systems through the Kvaser device.

In contrast to a CAN interface with software-implemented silent mode, the Kvaser USBcan Pro 4xCAN Silent is internally wired by hardware to be permanently silent. This means it is not capable of transmitting any CAN data frames, error frames, or any other frames, and it will not participate in the normal CAN protocol by transmitting an Acknowledge (ACK) slot after receiving a proper frame from another device. More simply stated, in ISO 11898 terminology, the Kvaser USBcan Pro 4xCAN Silent interface will never drive the CAN bus to a dominant state.

The Kvaser CANlib SDK works at the raw CAN frame level.  This means the API  can be used to implement software that communicates using J1939, CanOpen, NMEA2000, DeviceNET, UDS, etc.  The implementation of these protocols is the responsibility of your application.

GEMAC, a German manufacturer of fieldbus diagnostics devices, is supporting Kvaser CAN interfaces in the latest version of its CANvision protocol monitor, version 1.3.4.1. The bus monitoring and decoding software, which handles CAN, CANopen, CANopen FD and SAE J1939 (including NMEA 2000® and ISOBUS) messages, supports Kvaser in interface mode only.

For more information on CANvision, please visit gemac-fieldbus.com/en/ or address questions to support@gemac-fieldbus.com.

AutonomouStuff has created ROS (Robot Operating System) support for Kvaser interfaces using the Kvaser Linux driver. You can find the Kvaser ROS support package and dependency information here: https://github.com/astuff/kvaser_interface

If you still have questions, please contact AutonomouStuff support at: support@autonomouStuff.com

We recently updated the terminology from ‘t programming’ to ‘ t script‘. The change highlights the embedded scripting capability of the language, which allows users to directly interact with hardware events and control CAN bus communication at a low level. This shift in terminology emphasizes its use as a powerful tool for automating and customizing tasks in embedded systems, leveraging a C-like syntax for simplicity and efficiency​. Due to this recent change of terminology, previous documents and publications might still have the ‘t program’ or ‘t programming’ terminology in it, while newer publications will use ‘t script’ or ‘scripting capabilities’. 

CAN has undergone many updates since it was launched in 1986. As a result, CAN in Automation (CiA), the international users’ and manufacturers’ group, has introduced new terms to describe the different CAN protocols now available:

• CANclassic (abbreviated to CAN CC)
• CANflexible data rate (abbreviated to CAN FD)
• CANextended data-field length (abbreviated to CAN XL)

CiA also specifies and maintains two application protocols that run on CAN:

• CANopen (application running on CANCC)
• CANopen FD (application running on CANFD)

Throughout the Kvaser website, when the term CAN is used, we refer to CAN classic. Similarly, when CANopen is mentioned, we refer to CANopen Classic.

Multiple handles to the same channel work like a virtual bus extension.  When a message is successfully placed on the CAN bus through the canWrite call, a copy of the message is placed in every handle’s receive buffer associated with the same channel.  This is the default behavior.  You can change this behavior for a handle using the canIoCtl function with a func parameter value of canIOCTL_SET_LOCAL_TXECHO.  See the API documentation for more detail.

The Kvaser U100 will run on almost any hardware. With no repacking and bundling in the USB communication, the Kvaser U100 creates more USB packets when compared to a Kvaser Leaf Pro or Leaf Light. The load on the host CPU will be higher, so it is recommended that the host application has access to enough CPU cores. The Kvaser U100 also requires USB controllers and hubs that are quick and have adequate capacity. (Almost all PCs sold in the last 5 years will have the proper capacity).

Internally: The Kvaser U100 uses a much more powerful processor compared to the Kvaser Pro and Light interfaces. Even though it is more powerful, it still consumes less power.

Externally: The USB communication is much more optimized, both in the Kvaser U100 hardware and also in the Kvaser Drivers. There is no need to do any smart “repacking and bundling” of the CAN frames as the Kvaser U100 has the capacity to handle both USB and CAN communication at the same time.

Kvaser CAN Extcap

Kvaser CAN Extcap is a plugin for Wireshark. It makes it possible for users to connect Kvaser CAN and CAN FD interfaces to Wireshark. 

With this plugin it is possible to ; 

• Capture CAN and CAN FD data 
• Logg CAN and CAN FD data 

Where do I find it? 
It is available free on our website:  https://kvaser.com/download/ 

What is Wireshark? 
Wireshark® is a network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is freely available as open source and is released under the GNU General Public License version 2.