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help with canbus

3070 Views 34 Replies 7 Participants Last post by  DMPstar
I need help figuring out why my Hyper 9's are complaining about canbus errors.

I have 2 hyper 9's, Orion BMS 2 (which is communicating very happily on the canbus even after the Hyper 9's shut down), Elcon charger, Elcon DC/DC.

I've got 120 ohms on the Elcon charger terminating one end of my network. The 120 ohm resistor in the Orion has vanished, so I put a 120 ohm resistor on the connector to it as termination of the other 'end'. The Hyper 9's and Canbus to USB adapter are in the middle.

Everything is working great, green lights and no faults on the Hyper 9's and the Orion until I hit the throttle, and then the Hyper 9's throw a series of errors relating to protocols - which I understand means canbus has failed.

Any thoughts?
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You should not create long stubs when you tap into the main bus run.
Electrician Electrical wiring Electronic engineering Engineering Science

Anything more than an inch or two stubbing off will affect the transmission characteristics of the bus and could create signal errors.

The termination resistor has to go at end of the furthest run of wire.
 

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All depends on his noise margins, which are gunna be shit with that rat's nest. If canbus wasn't sensitive, they'd have pullup instead of termination resistors that you could put anywhere on the bus vs at the end of it.

Start with best practices, then troubleshoot from there.

Twisted pair's a good start.
 
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