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:
OVMS v3 HUD/OBDII-F Cable
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.