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Home > Technical > CAN Bus Testing |
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Andy131 Member Since: 10 Dec 2009 Location: Manchester Posts: 2161 |
The unit derives power from the USB side. In theory you need CAN-hi and CAN-lo and ground. In practice I don't bother with ground. The device just sits on the bus quietly reading all the messages.
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3rd Jul 2018 5:24 pm |
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aesmith Member Since: 10 Jul 2012 Location: Scotland Posts: 76 |
Something like that would be ideal, but I guess outside the price range for an end user. I was looking at USB scopes, however it would need at least two channels and preferably a differential function. ----------
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3rd Jul 2018 7:25 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4640 |
Indeed, only power and high speed CAN connections are needed - 4 wires. The low speed CAN modules will appear as not present on the tester, but they are irrelevant for the proposed scope. |
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3rd Jul 2018 9:49 pm |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 2795 |
Tony
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3rd Jul 2018 10:26 pm |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 2795 |
This is the wiring diagram for HS CAN. ( on page 8 )
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3rd Jul 2018 11:29 pm |
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aesmith Member Since: 10 Jul 2012 Location: Scotland Posts: 76 |
I hadn't, thanks. That's interesting. And yet horrible as well, because he only found a noticeable difference with one particular movement of the connector. Later in the video he was moving the wires quite roughly side to side with no apparent effect. I'm not convinced I would have found that without his recording DMM, on his gear the spike is really noticeable compared to catching a very short change in the digital display. ---------- Tony S |
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4th Jul 2018 9:07 am |
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aesmith Member Since: 10 Jul 2012 Location: Scotland Posts: 76 |
Cheers again. Do you happen to know physically where I'd find those two points identified, or what sort of connector or splice I would find there? Thanks, ---------- Tony S |
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4th Jul 2018 10:47 am |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 2795 |
Tony
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4th Jul 2018 2:19 pm |
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