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Update rusEFI-calibration-via-CAN.md

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rusEFI-calibration-via-CAN.md
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With all the electromagnetic interference around the gasoline engine due to sparking CAN physical layer provides the level of reliability above RS232 and USB physical layers.
rusEFI acts as a tranlator between either Linux SockerCAN or Windows PCAN and TunerStudio since as of March 2024 TunerStudio does not integrate with any CANbus dongle native.
[ISO 15765-2](PDFs/ISO-15765-2-2004.pdf), or ISO-TP (Transport Layer), helps us exchange up to 4096 packets into which we wrap TS protocol. See also [wikipedia](https://en.wikipedia.org/wiki/ISO_15765-2)
[https://github.com/rusefi/rusefi/tree/master/java_console/io/src/main/java/com/rusefi/io/can](https://github.com/rusefi/rusefi/tree/master/java_console/io/src/main/java/com/rusefi/io/can) folder has java implementation of ISO-TP packet encoding/decoding.
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## PCAN
It works! https://www.youtube.com/watch?v=Mwgq26M5-JY
Between three major professional CAN frontend vendors we like PCAN by [https://www.peak-system.com/](https://www.peak-system.com/) due to the combination of the following
1) documented Windows DLL drivers with official java wrappers called [PCAN-Basic API](https://www.peak-system.com/PCAN-Basic.239.0.html?&L=1)
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## ELM327
Could have should have worked, but it does not.
With more than a dozen magic commands it's possible to switch ELM327 device into binary transition with serial communication between calibration software and ELM327 acting as a bridge. At the moment we have a very odd bug making the overall solution not working as of Jan 2022.
See [https://canhacker.com/ch-obd-m02/](https://canhacker.com/ch-obd-m02/) for great pinout image. Yes both GND are needed for reliable ELM327 operation.