I've had a little more of a play tonight, and I think it's starting to make sense. (Thanks Kevin)

Regardless of the position of the DIP switch, my TWC, upon detecting a vehicle, will start generating a 1kHz 5% Duty Cycle PWM signal ('Digital Comms'). It will generate this for about 3 seconds, and ...

Kevin Sharpe wrote: ↑Sat Jun 06, 2020 6:02 am 5% duty cycle indicates digital communications. Here's an extract from IEC61851-1{ed2.0}

Thanks.

What does IEC61851 define as digital comms? I believe it is ISO 15118-3 HomePlug Green PHY for talking to DC fast chargers.

I'll see if I can get a Oscilloscope trace and post it, but as per my post above:


As promised, this is what a charging session between a Model 3 and TWC 4.5.3 looks like:

6sec.png
Charger idle @ 12V.
Plug Inserted @ approx 700mS. Signal pulled down to 9V by car's 2.74k resistor ('Vehicle ...

That would make sense, I know a lot of commercial sites that deployed TWC were unhappy with the incompatibility with non Tesla cars.


Yes, I think the intent is to make it compatible, but practice is a different thing. My father has a Hyundai Kona - It refuses to charge from my TWC running 4.5.3 ...

Kevin,

From what I can understand, different firmware on the TWC behave in different ways. I'm running what I believe is the latest (for Gen 2) 4.5.3. In 4.5.3, the DIP switch doesn't appear to do anything. With an oscilloscope on the CP when a Tesla is connected, shows it talks in SWCAN mode ...

Quick progress update:
Over the weekend, I wrote some code to decode many of the SWCAN messages:
https://github.com/craigpeacock/Tesla-C ... rt-Decoder

Just need to work out now how to get a TWC to switch to SWCAN mode.

Thanks Damien.

I'll continue to see if I can work out how to enter SWCAN Mode.

Attached is some of the CAN IDs and packets I see between a TWC and a Model 3.

Just a little heads up on a new version of the Gen 2 and Gen 3 charger boards under development. They will feature the ability to switch the pilot signal between standard J1772 protocol and SWCAN. I was donated a Tesla wall connector that finally got installed last week. These can be set to "Tesla ...