This is a neat and interesting device. It sniffs CAN bus with out breaking the wires.
http://www.gps4net.com/can-obd2-interfaces/g4n02tap-wire-tapping-contactless-reader-can-bus-jbus-fms-j1939-j1708-j1850-j1587-iso11992-iso11783-obd2-telematics-standard.html
contact-less CAN reader
contact-less CAN reader
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Re: contact-less CAN reader
That's pretty amazing. I'd be interesting in trying to build one.
Re: contact-less CAN reader
They post a back side picture, doesn't look very complicated.
![Image](http://www.gps4net.com/images/gps4net/products/g4n03tap/g4n03tap_pcb.jpg)
![Image](http://www.gps4net.com/images/gps4net/products/g4n03tap/g4n03tap_pcb.jpg)
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Re: contact-less CAN reader
My guess is the comparator is used in Schmitt trigger fashion to amplify the induced voltages from the coils (air-core transformer) laid into the board. That signal is then fed to the CAN transceiver to drive the CAN output. Differential signal in, easy to amplify. As the site said, RS-485 is compatible as well, which is also a differential signalling system.
Josh
94 Ford Taurus SHO
Frankenso in progress
94 Ford Taurus SHO
Frankenso in progress
Re: contact-less CAN reader
Similar but different. It's an ESP32 wireless can bus gateway.
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