I'm using the MVPI Pro interface, and I have an Innovate LC-2 tied into it using its 5V analog output. The innovate controller is configured to output 4V while the sensor warms up and before it starts outputting the typical 0V-5V output. Today I noticed that VCM scanner was showing ~4.1V during warm up before the normal readings started showing up.
VCM scanner can actually pull serial (digital) data direct from the wideband controller as well. I figured out today that the response rate and resolution is much higher from the digital output vs the analog output, and I also noticed that the transformed analog data was showing about 15.0 AFR at idle while the digital data was hovering around 14.7 AFR.
The transform equation is (voltage / 0.3324) + 7.35 = AFR. That 0.1V corresponds to a 0.3 AFR error (0.1V / 0.3324 = 0.3) which I was also seeing comparing analog data vs digital data side by side. I'm not sure if the error is on the MVPI interface side or if it's on the wideband controller side (maybe tech support can offer some insight?), but the point is that you should double-check your numbers. In this case, the wideband controller is calculating AFR and then generating a voltage based on that value. The MVPI interface measures that voltage and converts it back to AFR. It's like a game of telephone. The digital interface gets rid of that variability and error that can often plague analog signals.
Hope this is helpful for someone else too.