Re: Non Powered Devices

Hi John,

Waking up the list again :-)

As far as I know this problem only occured at the old 250 driver. Since 
the 251 all CAN transceivers should be well protected and also don't 
influence the bus if they are not powered. I mostly use NXP and 
Microchip transceivers and did not notice any disturbance with 
non-powered devices connected to the bus. They behave as very high 
impedance inputs.

Kees


Op 4-7-2018 om 02:19 schreef John Dammeyer:
>
> Way back at the beginning it was pretty well a rule that all nodes on 
> a CAN bus should be powered.With Steve Corrigan from TI no longer with 
> us I don't have access to a CAN driver designer to ask that question. 
> And there are way more drivers out there than there were 25 years ago.
>
> What's the general rule on that now?Will an unpowered CAN driver 
> adversely affect the CAN bus signals and/or are there some that can 
> even be damaged?
>
> Thanks
>
> John Dammeyer
>
> "ELS! Nothing else works as well for your Lathe"
>
> Automation Artisans Inc.
>
> www dot autoartisans dot com
>