Which USB-C pins are used to trigger parking mode in dashcams? Is there a standard?

Now we know that the output pins on the ddpai Intelligent Hardwire Kit are A8, A11 & power lines.
Using a type-C male test board & a female test board, I connected HWK to the ddpai A400
with A8 & power lines, without A11 line.

Test board connection.webp

I found that the DVR recognized HWK and parking mode menu appeared.
But after cutting off ACC, the DVR did not enter timelapse recording.

 
After also connected A11, cutting off ACC and the DVR entered timelapse recording.


So, I think A8 is for recognition of HWK, and A11 is for entering timelapse recording.
 
If you want an USB cable to be used for parking mode with your Viofo dashcam, you need to know that the official Viofo USB-A to USB-C can offer parking mode, but not USB-C to USB-C. My advice is to obtain the USB-A to USB-C Viofo cable for parking mode.
 
nianeko1 said:
Now we know that the output pins on the ddpai Intelligent Hardwire Kit are A8, A11 & power lines.
Using a type-C male test board & a female test board, I connected HWK to the ddpai A400
with A8 & power lines, without A11 line.

View attachment 85594

I found that the DVR recognized HWK and parking mode menu appeared.
But after cutting off ACC, the DVR did not enter timelapse recording.

Click to expand...
Why are you disconnecting the red wire (BATT?)?
 
nianeko1 said:
Now we know that the output pins on the ddpai Intelligent Hardwire Kit are A8, A11 & power lines.
Click to expand...
In the old days of micro-USB ddpai HWKIT used D+/D- (and 2 middle pins of the headphone jack)
as RX/TX 3.3V UART pair @9600bps which was connected to the serial port in the dashcam and in the power DC-DC converter.
This is the true meaning of "Intelligent", it uses bidirectional UART protocol for the communication with the power supply MCU.
 
Last edited:
helg said:
In the old days of micro-USB ddpai HWKIT used D+/D- (and 2 middle pins of the headphone jack)
as RX/TX 3.3V UART pair @9600bps which was connected to the serial port in the dashcam and in the power DC-DC converter.
This is the true meaning of "Intelligent", it uses bidirectional UART protocol for the communication with the power supply MCU.
Click to expand...

Thank you for your infomation.
I understand what is meant by "Intelligent."
So now ddpai HWK is using this system on USB Type-C as well.
When I saw the voltage on the pins, I should have realized they are communication ports.
 
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