Frequently Asked Questions

FAQ

Here you will find answers to frequently asked questions.
 

What is a CCA?

CCA is the abbreviation of Car Communication Analyzer. A CCA is a requirement-specific, configurable high-end data logger. CCAs ensure lossless archiving of all control data of the entire vehicle communication in real time. They are characterized by high performance with small dimensions. Different CCA models with different performance data are available.
 

For CCA data loggers there is a range of accessories such as CCA removable data storage, CCA Capture Modules and CCA Copy Stations.
 

What makes CCA data loggers unique?

High bandwidth: Recording data rates up to 6.4 Gbit/s make the CCA data loggers currently unique in the market of mobile, automotive appropriate data logger.

 

Innovative data handling: The concept of removable data storage of the CCA 9002 / CCA 9003 with up to 16 TB memory in combination with the Copy Station CCA CS1-10G featuring a 10 Gbit Ethernet interface enables the comfortable handling of the enormous amounts of data that today arise in the testing of advanced driver assistance systems having imaging sensors.

 

Flexibility: CCA data loggers are modular and allow a customized configuration on the respective specific application. If something is missing, we develop it together with you.

 

Sustainability: The modular configuration of a CCA data logger can also be retrofitted to adapt to new projects and requirements.

 

All-in-One: All automotive bus systems of a vehicle will be merged into one data logger.

 

Synchronicity: All incoming data received a common, synchronous time stamp with 100 ns resolution.

 

Intuitive operating software: The browser-based CCA software is up-to-date. Operate your CCA data logger with your PC, tablet or smartphone without installing drivers and tools and without license model for use, updates and upgrades.

 

For which applications CCA data loggers are intended?

CCA data loggers are used close to development for the validation and qualification of driver assistance systems and autonomous driving functions. They are developed for use in vehicles, in laboratories and on test stands.

They record the internal and external communication of ECUs and sensors on the various bus systems and to provide this data with a common, synchronous time stamp. Thus, the complete data communication is clearly documentated in its temporal processes and causalities become verifiable.

 

What are CCA Capture Units?

CCA Capture Units are plug-in modules that combine a number of bus interfaces. With Capture Units, the type and number of interfaces of CCA 9002 or CCA 9003 data loggers can be varied project-specifically. Configuration and installation of the Capture Units takes place exclusively in the factory.

The modular CCA system architecture of the CCA 9002 and CCA 9003 data loggers allows easy integration of Capture Units to be developed in the future. If bus interfaces are missing, we will develop optimal Capture Units for your application together with you.

 

Is it possible to retrofit or replace Capture Units?

Yes. The CCA data logger must be sent to the factory for this purpose. New rear covers are required for an extension. Just ask us for the conversion of your CCA.

 

What about time stamps?

The recorded communication of the various bus systems is provided with common synchronous time stamps.

The time stamps are assigned hardware-side by the FPGA of the CCA base data logger respectively the FPGAs of the Capture Units with the receipt of the first bit of a data frame. The accuracy of the time stamp is ± 1 µs for the entire system (CCA base data logger with different CCA Capture Units). The resolution is 100 ns. The CCA supports gPTP time synchronization.

 

In which format do CCA data loggers store the incoming data?

The CCA supports different storage formats for individual bus interfaces or interface groups. Incoming data can be stored in the following file formats:

 

PCAP: The standard format of the freeware Wireshark can only contain Ethernet UDP messages.

VPCAP: The VPCAP format differs by an additional header from the standard Wireshark format PCAP. This header enables to save not only Ethernet UDP messages (as with PCAP), but also save messages of other automotive buses (CAN, FlexRay, etc.). VPCAP is readable with Wireshark

MDF 4.1: The MDF file format was specified by ASAM e.V. (Association for Standardisation of Automation and Measuring Systems). The CCA writes a MDF variant specified by ViGEM. The specification can be downloaded from the ViGEM Download Center.

ADTF DAT: The DAT file format was specified by Elektrobit Automotive. The CCA writes a DAT variant specified by ViGEM. The specification can be downloaded from the ViGEM Download Center.

 

 

The Software Suite CCA TOOLS contains the software CCA Converter, which allows conversion of the VPCAP format to other formats such as:

 

Vector ASC

Vector BLF

MOST Data Analyser (img file)

VPCAP

PCAP (Ethernet only)

Telemotive ASCII

TXT (RS232 and Ethernet only)

MP4 (video stream only)

AUTOSAR DLT (default)

ADTF DAT

MDF 4

 

How is the recorded data stored onto the removable data storage?

The recorded data is bundled and saved in files.

A new directory is created for every recording session and every writer. Files are created within this directory. In addition, a meta file is created (with the “.vci” extension) that contains a description of the recording. By default, every directory name starts with the name of the CCA data logger and ends with the date and starting time of the recording session.

 

What happens if the power supply to the CCA is interrupted during data logging?

The CCA has no internal battery that would allow controlled shutdown after power failure. Several aspects have to be considered:

 

1. Continuous recording
If a file is completed correctly, it is renamed to the extension of the selected storage format (.pcap│.vpcap│.dat│.mdf).
In the event of an abrupt power failure, the file being written to can not be closed correctly. There remains a file with .temp extension.

 

2. Triggered recording
For triggered recording, .temp folders are created in which the triggered data, including the lead and lag of the trigger, are stored in .temp files. Only when the trigger is correctly terminated will files and folders be renamed. If the power supply is interrupted, it will not be properly terminated or renamed. The folders and files remain in .temp format.

 

3. Data formats PCAP and VPCAP
Recorded data written in .pcap or .vpcap format is also readable and available as a .temp file.

 

4. Data formats DAT and MDF
In the event that the data is written in .dat or .mdf format, the .temp file is considered corrupted. The data of the .temp file are not readable and thus lost.

 

5. Buffered data
All recorded data that has been buffered in memory and could no longer be written to the SSD due to a power failure is lost.

 

6. If "Autostart = enabled"
Once the power is restored, the CCA will power up and record according to the configured settings.

 

Can two CCA data loggers be joined together?

Yes, this has the following advantages: More available ports, even higher data rates and even more storage space.

The two CCA data loggers are connected via the CCA synchronization interface (CAN TS).
One CCA is the timer (master), the other CCA is the timekeeper (slave). When master and slave are started, the master sets the date and time for the slave every 500 µs. The difference between the two times is maximum 1 µs.

To merge the recorded data the software tool CCA Converter is required. This software is free to download in the ViGEM Downloads Center. The CCA Converter is available with a GUI as well as a command line tool.

 

Is a WLAN connection with a CCA possible?

Yes, a WLAN connection as a client is possible. An external USB WiFi adapter is required for this purpose.

 

Where can I find current data sheets or software and firmware releases for the CCA system family?

This and more can be found in the ViGEM Downloads Center. Downloads are for registered users only. Please sign up to take advantage of this ViGEM service.

 

What are CCA Safety Instructions?

The document "CCA Safety Instructions" contains important information that is required for the reliable, safe and correct operation of the Car Communication Analyzer. Please note these. If you have any questions, please contact ViGEM GmbH. The CCA safety instructions can be downloaded as a registered user in the ViGEM Downloads Center.

 

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