Through the analysis of OSC482L for CAN bus interface, the instrument CAN choose A variety of measurement methods, measurement CAN support single or double way, one CAN support the automatic test and measurement, CAN_H to ground, CAN_L on three ways to support automatic way of double difference measurement, and A - B channel difference,
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This test adopts single CAN_H way to the ground,
Outside for two CAN bus equipment, will be A channel pens and respectively and CAN_H and connected and started rising along the single trigger mode,
Communication in the actual periodically send CAN standard frame ID 0 x70a, one byte length, D0 0 x7f,
Actually after capture, properly adjust the position of the waveform on the screen CAN be observed that software for CAN bus waveform analysis results are completely correct,
Adjust the content again to send, and then start the capture function, CAN see the oscilloscope capture the CAN data frames, and accurately analyze the results,
Summary, in view of the CAN bus protocol analysis, found the following several aspects:
1, OSC482L for CAN bus data acquisition method is more flexible, support for single and double difference way, this is very good, very flexible;
2, by means of a single trigger, CAN obtain a single frame of CAN bus data;
3, the oscilloscope waveform software CAN automatically analyze the grab, and will be in the form of DATA according to the CAN bus protocol analysis, intuitive and friendly show the ID, the DLC, the DATA such as domain content;
4, when we get a single frame information for the amplification of data is not very convenient, in the process of operation need to adjust the zoom ratio and position for many times, can let the waveform complete correct display at the center of the screen, Suggestions to further strengthen this part of the function, whether can become automatic center and enlarge the screen, to the extent permitted or select multiple frame data display in the middle of the screen;
5, the stability of the software also need to further strengthen,