CANscope is the measuring device for recording and evaluating the voltage levels on the CAN bus. CANscope offers a robust recording module and an easy-to-use evaluation software program. The recording module is connected to the PC via a RS232 or USB interface.

Features/Advantages

CANscope enables the developer to analyze the effects of:

• Various cable types and lengths.
• Bus drivers and terminations.
• Failures.
• EMC influences.
• Errors in the ECU software or in CAN controllers.

For targeted debugging, there are many trigger conditions available. For example, upon occurrence of a particular CAN message or error frame, or if a level is exceeded or under-run, the trigger is activated and the trigger environment is completely recorded.

The following central functions facilitate users’ work with the CAN bus:

• Oscilloscope window for displaying the bus level.
• Eye diagram for evaluating the signal quality.
• Difference view for comparing voltage curves.

Typical application areas for CANscope:

• Analysis of the bus physics for analyzing specific features of a constructed network.
• Direct measuring mode for online evaluation of the data collected.
• Standalone operation for later analysis on a PC.

Integrated Database CANdb++

As with other CAN tools from Vector, the database CANdb++ is completely integrated. Message and signal designations can be represented symbolically in all windows and dialog boxes.

Direct Measuring Mode

After triggering a measurement, CANscope records the bus level with a configurable sampling frequency of up to 32 MHz and a maximum resolution of 20 mV. The module then transmits the data independently to the connected computer, where it can be interpreted and evaluated immediately by the evaluation software.

Standalone Mode

In addition to the direct measurement mode, CANscope can be operated in a standalone mode without a PC, e.g. during test runs in a vehicle or in an industrial facility. Evaluation occurs later on the PC.

Difference View

The difference view in CANscope compares the voltage curves of the signals of two recordings loaded into CANscope (e.g. for a reference measurement) and displays them as difference signals in the graphic window.

Eye Diagram

Through the overlapping of individual bits of a recording, the eye diagram allows you to recognize a suitable sampling time as well as bits whose transmission was flawed. In the eye diagram window, the CANdiff signal of a CANscope recording is divided into individual bits. The individual bit ranges are then overlapped and displayed graphically.

Detailed Evaluation

The evaluation software displays the bus levels of CAN-high and CAN-low as well as their difference voltage graphically in an oscilloscope window on a time axis (see picture below). Via an additionally generated graph the stuff bits in the signal process are displayed.

Oscilloscope Window/Trace Window

The oscilloscope window offers many functions, including those in the following areas:

• Configuration of the display detail.
• Comfortable measurement cursor.
• Configuration of the signal channels.

The levels sampled are interpreted by the evaluation software and listed in a trace window as CAN messages, message fragments, and error frames. By selecting entries in this trace window, the associated oscillogram detail is displayed in the oscilloscope window. Another feature of the trace window is the ability to drop down the bit fields of the corresponding message with time stamps (identifier, RTR, DLC, etc.). Selecting a bit field means that it will be marked on the oscillogram. The direct analysis of the oscillogram is also supported. If the measurement cursor is placed on a bit to be interpreted, the corresponding message and the bit field will be displayed textually.

Hardware Interfaces

CANscope offers the following connection options: CAN IN (high-speed or low-speed), RS232, USB 1.1 (via included adapter) and trigger input/output