[Ovmsdev] OVMS ODBII Cable

Michael Balzer dexter at expeedo.de
Sun Dec 9 19:27:23 HKT 2012


Mark,

I just read about the CAN bus using twisted pair cables like ethernet 
for shielding.

I don't know if the manufacturer will use twisted cables. I think 1m 
length untwisted should be no problem, but maybe that should be 
specified for the next batch, just to be on the safe side.

Regards,
Michael


Am 05.12.2012 01:14, schrieb Mark Webb-Johnson:
> Michael(s),
>
> We've just ordered 100 of these (gulp).
>
> Should be done in about a week.
>
> Regards, Mark.
>
> On 5 Dec, 2012, at 6:49 AM, Michael Jochum wrote:
>
>> Hi,
>>
>> Looks Good.
>> Right angle is ok.
>> Length is ok too.
>>
>>
>> Bye
>> Michael
>>
>> Von unterwegs gesendet
>>
>> Am 04.12.2012 um 06:06 schrieb Mark Webb-Johnson 
>> <mark at webb-johnson.net <mailto:mark at webb-johnson.net>>:
>>
>>>
>>> I've found a manufacturer for the cable, that seems quite good and 
>>> professional. I haven't used them before, but they come recommended. 
>>> I also tendered for this, and they were not the cheapest response, 
>>> but in the lowest 10%. Quality seems very good, and they specialise 
>>> in manufacturing automotive cables so should know what they are doing.
>>>
>>> Based on our specification:
>>>
>>>     J1962-M DB9-F Signal
>>>     4         3       Chassis/Power GND
>>>     6         7       CAN-H
>>>     14        2       CAN-L
>>>     16        9       +12V Vehicle Power
>>>
>>>     J1962 end should be MALE plug with right angle cable. DB9 end
>>>     should be FEMALE.
>>>     Both ends should be enclosed in shells, and cable should be
>>>     1metre in length.
>>>
>>>
>>> The resulting build spec sheet is shown below.
>>>
>>> Sorry it is mostly in Chinese, but the most important points are (a) 
>>> the pinouts, (b) the 1m length, (c) the use of a right-angled ODBII 
>>> connector, (d) the connectors types, (e) the pinouts, and (f) did I 
>>> mention the pinouts?
>>>
>>> Could you guys check this out, and confirm it looks ok from your 
>>> point of view? Something standard that the Twizy, Volt/Ampera and 
>>> other users could get behind?
>>>
>>> We are going to have to pay upfront for at least 100 of these, so 
>>> need to be certain it is correct. Pricing is going to be around US$9 
>>> - US$10 per cable (including worldwide shipping), which I think is 
>>> pretty good.
>>>
>>> Thanks, Mark.
>>>
>>> <PastedGraphic-4.png>
>>>
>>> On 12 Nov, 2012, at 7:09 PM, Mark Webb-Johnson wrote:
>>>
>>>>
>>>> I've found a couple of manufacturers willing to do this for a 
>>>> reasonable price (at a quantity of perhaps 50 to 100 units).
>>>>
>>>> Is the specification below ok? Any problems?
>>>>
>>>> Regards, Mark.
>>>>
>>>> On 11 Nov, 2012, at 1:36 PM, Mark Webb-Johnson 
>>>> <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
>>>>
>>>>>
>>>>> OK, so I think the pinouts we require are as per Michael B's diagram:
>>>>>
>>>>>
>>>>> <OVMS-OBD2-cable.png>
>>>>>
>>>>>     _J1962-M__DB9-F__Signal_
>>>>>     43Chassis/Power GND
>>>>>     67CAN-H
>>>>>     142CAN-L
>>>>>     169+12V Vehicle Power
>>>>>
>>>>>
>>>>> A right angle J1962-M plug and about 1metre cable should be ok.
>>>>>
>>>>> This one cable should support both Twizy and Volt/Ampera, and also 
>>>>> any ODBII car with an ODBII compliant CAN bus.
>>>>>
>>>>> Does that sound ok?
>>>>>
>>>>> I'll ask around in China to see if I can find someone to make 
>>>>> these up cheaply, and get them on Fasttech.
>>>>>
>>>>> Regards, Mark.
>>>>>
>>>>> On 11 Nov, 2012, at 7:50 AM, Michael Balzer <dexter at expeedo.de 
>>>>> <mailto:dexter at expeedo.de>> wrote:
>>>>>
>>>>>> 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.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>> 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
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>>>>>>>>>>> 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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>>>>>>>
>>>>>>>
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>>>>>>
>>>>>> -- 
>>>>>> Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
>>>>>> Fon 0202 / 272 2201 * Handy 0176 / 206 989 26
>>>>>> <dexter.vcf>_______________________________________________
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-- 
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26

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