Siglent SDS1104X-E CAN Bus Decoding

Siglent SDS1104X-E CAN Bus Decoding
In the video we will look at a 500kbs and 125kbs test circuit, press the Default button on the Oscilloscope and then set everything up so we can decode the signal using the SDS1104X-E

[ygglw]

To probe a differential signal such as CAN. Ignore the ground connection from your probes (I usually unclip them). Use two channels, one on each of the two CAN lines. On your scope using channels 1 and 3 will still provide the 1GS/s sample rate. Then generate a math channel of 1+3, hide channels 1 and 3, and run the decode on the math channel.

This removes any ground reference from the bus and allows you to differentially probe. Your signal level will double and there will be far less noise or decoding issues on your signal.

It is unwise to ever clip the ground to either CAN line, because there may well be a ground reference somewhere else in your circuit with a DC offset to the CAN lines, which may end up shorting out your transceiver to ground via your oscilloscope.

[GoldenChannels]

Just bought one of these scopes. Very helpful intro to using the decoders. Thanks!

[fastbike]

Very useful thx - I'm just starting to play with some CANbus home automation gear.

[tHaHxr]

10:10 I suspect you got the sporadic errors due to the high bandwidth, and switching to x1 reduced the bw considerably. Almost every modern scope has a 'limit BW' feature which would help as well.
Regardless, great video.

[tanner]

Are the decoded CAN/Serial messages able to be saved to internal or external memory? When I logged a CAN bus to CSV on mine, it just seemed to record the raw values 🤔

[bennylloyd-willner]

Great video, I am contemplating getting my first oscilloscope in about 35 years 😁 I have been away from electronics for far too long, and the Siglent SDS1104X-E seems to fit me well. I have peeked at a Rigol equivalent to save some money, but since I am also interested in understanding the CAN bus I think I'll go for the Siglent. Interested to see what you are up to in other videos so I subbed. The weather is getting worse here in Sweden so many long nights indoors make Electronics and Smart Home stuff tinkering very possible😁

[shaad]

The local supplier of Siglent SDS1104X-E told me separate paid licenses key needs to activate mso. That's is very costly over 1000$ with logic analyzer probes.

[MarcioRochaLopes]

I had forgotten that part (threshold) in the i2c decoder. 6:43 thanks