[Ovmsdev] HUD Cables

Stephen Casner casner at acm.org
Wed May 23 14:55:59 HKT 2018

On the Roadster drive organized by spiderguy this past weekend, one of
the participants mentioned that he had to remove his OVMS because he
had installed a dashcam and needed to plug into the diagnostic
connector to get +12V.  I told him that OVMS v3 will have the ability
to present an OBDII connector, which is what the camera really wants.

Does the +12V Vehicle Power just come straight through from the
diagnostic port connection?

                                                        -- Steve

On Wed, 23 May 2018, Mark Webb-Johnson wrote:

> As discussed, the HUD cables have been produced and seem ok. I received a pair today, hot off the production line in China. Here is the specification:
> One end (DA26-M) connects to the OVMS v3 DIAG (expansion) connector. The other end provides an OBDII female (J1962-F) connector. Cable wiring is as follows:
> J1962-F   DA26-M  Signal
> 4         8       Chassis/Power GND
> 5         8       Chassis/Power GND
> 6         16      CAN-H (primary CAN)
> 14        6       CAN-L (primary CAN)
> 16        18      +12V Vehicle Power
> Cable includes a 120ohm resistor between DA26 pins 16 and 6.
> This provides for an OBDII expansion port for OVMS v3 and allows devices such as OBDII dongles, Heads-up-Displays (HUDs), etc, to be connected to OVMS using the ‘obd2ecu’ firmware module.
> They look really nice. Moulded, tough, and stubby. DA26 expansion connector to OVMS has screws to hold it in place, and they seem to work well. We had to make a MOQ (minimum order quantity) of 100, and they will go up on Fasttech over the next couple of days (along with stock replenishment for some other cables running low / out of stock). These are relatively expensive to make (moulded DA26 connectors, 120ohm resistor, etc), so will be US$14.50 each (including free shipping).
> Regards, Mark.

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