[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>
>>>>>>>>> _______________________________________________
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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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