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I finished putting together the DIYPNP MS kit for my '97 Miata by following the instructions on Diyautotune's website. I plugged the MS into my desktop via a usb to serial connector and powered it via a dc power adapter. I'm getting the following error. Any troubleshooting suggestions? I know this usb-seral adapter works because I use it to work with my networking equipment(routers/switches).