Freematics Forum

Good evening,
I am trying to communicate with the ECU at request address 7E7.
My vehicle has 2 ECUs. The first one is at address 7E1 and the second at 7E7. However, when I set the header to 7E7, I receive "NO DATA" back from the STM on the UART bus.
However, if i get out my trusty cell phone ...

From my experience, not all of the ELM327 AT commands were implemented in the firmware that was flashed to the chip. This is why you're getting some question marks back. I've had the same issue myself.
From the looks of it, you just want to set a header so you can request manufacturer-specific data ...

Stanley,
I am using the OBD2UARTv1. My code detects when it can no longer communicate with the vehicle and then puts the ELM/STM chip to sleep using the built in lowpowermode function. Once that completes, I then leavelowpowermode and request the voltage using obd.getVoltage(). Then repeat the loop ...

I don't believe you are able to update or access the firmware in that model at all. In the past, I have used a secondary chip (Arduino in my case), hooked it up via a UART connection, and then programmed the Arduino to communicate with the OBD chipset. That is my experience with both the OBD2UARTv1 ...

I created a new function in the OBD2UART.cpp file. Stanley, can you verify that my format is correct? I believe it needs to be 'header' # 'dataMode' 'pid'. The intention is then to be able to request custom manufacturer-specific PIDs that require a header. Do you believe this will function as ...

Good morning,
I am rather novice at C++, but purchased the UART adaptor and have it working very well on my vehicle. While testing, I noted that some PID requests were incrementing the obd.errors variable (which is totally fine). I wanted to determine what the error was so that I could ...