[Ovmsdev] Twizy

Sun Nov 11 07:50:54 HKT 2012

For the record: I now have connected GND to both 4+5 on the OBD2 plug, 
works as well.

Regards,
Michael

Am 10.11.2012 19:57, schrieb mikeljo at me.com:
> Hi,
>
> i use this pinout:
>
> Primary Data Link Connector- (DLC) X84 *Under drivers side of IP
>
> Pin 1 is Low Speed GMLAN (SWCAN ~33.3kbps) - Body Electrical Services 
> Only Pin 2-3 Unused
> Pin 4 chassis ground (for scan tool)
> Pin 5 data reference ground
>
> Pins 6(+) & 14 (-) High Speed GMLAN- Primary Powertrain Bus (DWCAN 
> ~500 kbps) Pins 7-11 Unused
> Pins 12(+) & 13(-) High Speed GMLAN- Chassis Expansion Bus (DWCAN ~500 
> kbps) Pin 15 Unused
>
> Pin 16 B+ (for scan tool power)
>
> OBDIISub-DSignal
> 169+12V
> 46+3GND-Chassis
> 67CAN_H
> 142CAN_L
>
> I connect 6 and 3 at the Sub-D side together.
> So it looks like we can use the same Cable (for the Primary Can Bus in 
> the Volt). >> Fasttech?
>
> Bye
> Michael
>
>
>
> Am 10.11.2012 um 06:47 schrieb Mark Webb-Johnson 
> <mark at webb-johnson.net <mailto:mark at webb-johnson.net>>:
>
>> Yes, chassis GND vs signal GND, but can is differential, so no GND 
>> needed for the signal. We only need GND for 12V power. For vehicles, 
>> I think chassis GND is ok.
>>
>> I think Volt bus we are using is on the same pins:
>>
>> http://www.evtools.info/ChevyVoltOBD2CAN.html
>>
>> Maybe 1 cable can do both?
>>
>> Regards, Mark
>>
>> On 10 Nov, 2012, at 12:18 PM, Michael Balzer <dexter at expeedo.de 
>> <mailto:dexter at expeedo.de>> wrote:
>>
>>> Mark,
>>>
>>> yes, that's chassis ground -- shouldn't it be? I interpreted the 
>>> OVMS GND as the ground for the supply voltage (12V), as the CAN bus 
>>> has its dedicated "low" line.
>>>
>>> I just looked up some OBD2 sites: 4+5 normally are the same. One 
>>> page says an OBD2 cable should have identical potential on 4 and 5 
>>> to ensure proper function. Another OBD2 cable I bought connects 
>>> them, so maybe for a general product GND should connect both, but I 
>>> don't think there's a difference on the car side... normally.
>>>
>>> But I've also seen some info on non standard OBD2 plugs, also for 
>>> some GM and Opel cars, having other signals where the CAN bus should 
>>> be, so I'm also interested in your pinout, Michael J.
>>>
>>> Regards,
>>> Michael
>>>
>>>
>>> Am 10.11.2012 04:23, schrieb Mark Webb-Johnson:
>>>> Michael,
>>>>
>>>> One question: you have GND on pin #4 (odb). I have that shown as 
>>>> chassis ground, not signal ground. Is that correct?
>>>>
>>>> Michael J: is that the same connector and pins as you are using for 
>>>> the Volt?
>>>>
>>>> Regards, Mark
>>>>
>>>> On 10 Nov, 2012, at 2:16 AM, Michael Balzer <dexter at expeedo.de 
>>>> <mailto:dexter at expeedo.de>> wrote:
>>>>
>>>>> Mark,
>>>>>
>>>>> great to hear about user activity :-)
>>>>>
>>>>> 1) I just created an OVMS to OBD2 cable image and checked it in:
>>>>> https://github.com/dexterbg/Open-Vehicle-Monitoring-System/commit/a7c3a3e8f12d7759b896bb75c8e570ebc10ec11a
>>>>> As OBD2 is standard incl. CAN pinout, this should be valid for any 
>>>>> OBD2 port, so could be added to the FastTech OVMS product line. 
>>>>> It's not a standard cable, or at least none I know of.
>>>>>
>>>>> 2) No known way up to now. I also think the Twizy would not 
>>>>> respond to the port, as the whole CAN bus is quiet when the car is 
>>>>> off and not charging. Plus, because the charger draws some 30-35 W 
>>>>> for many hours after charging has completed, many drivers use 
>>>>> auto-power-off sockets.
>>>>>
>>>>> 3) I'll forward your specification to the german Twizy forum.
>>>>>
>>>>> Regards,
>>>>> Michael
>>>>>
>>>>>
>>>>> Am 09.11.2012 15:23, schrieb Mark Webb-Johnson:
>>>>>>
>>>>>> Twizy support seems to be coming along nicely, thanks to the 
>>>>>> amazing work Michael is doing. Some good functionality there already.
>>>>>>
>>>>>> I'm starting to see some Twizy users register on openvehicles.com 
>>>>>> <http://openvehicles.com/>. Perhaps the word is getting out?
>>>>>>
>>>>>> Some questions / requests:
>>>>>>
>>>>>>  1. Michael: Can you let me have the details on the cable pinouts
>>>>>>     and parts you are using at the moment? Is it a standard
>>>>>>     cable, or are you having to make something up?
>>>>>>
>>>>>>  2. How is charge control on the Twizy done? Is there any way of
>>>>>>     stopping or starting (topup) a charge from within the car, or
>>>>>>     is it just controlled by plugging? Any chance of can bus
>>>>>>     control of this?
>>>>>>
>>>>>>  3. Can anyone help with the car images for the Twizy? There are
>>>>>>     lots of nice images available, but they need to be
>>>>>>     photoshopped to the right dimensions and transparent
>>>>>>     background png.
>>>>>>
>>>>>>
>>>>>> Regards, Mark.
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> OvmsDev mailing list
>>>>>> OvmsDev at lists.teslaclub.hk
>>>>>> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
>>>>>
>>>>> -- 
>>>>> Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
>>>>> Fon 0202 / 272 2201 * Handy 0176 / 206 989 26
>>>>> <dexter.vcf>
>>>>> _______________________________________________
>>>>> OvmsDev mailing list
>>>>> OvmsDev at lists.teslaclub.hk <mailto:OvmsDev at lists.teslaclub.hk>
>>>>> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
>>>>
>>>>
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>>>
>>> -- 
>>> Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
>>> Fon 0202 / 272 2201 * Handy 0176 / 206 989 26
>>> <dexter.vcf>
>>> _______________________________________________
>>> OvmsDev mailing list
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>>> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
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>
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-- 
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26

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