Reading data by induction

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TiagoRibeiro

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Hello,
anyone have any circuit or any explanation for reading data on a communication line by magnetic induction?
I would like to make a CAN data reader similar to clamp multimeter.
Thank you
 

The standard CAN interface uses differential signalling, a current transformer around the CAN twisted pair will ideally receive no signal. You would have to sense the (small) dipole field involved with the non-zero distance of the twisted pair wires.

Also the bus state is primarly represented by voltage not current. Signal current will be only observed between the driving node and a terminating resistor.
 

Not a complete circuit, just a design concept.

A coil lateral to the twisted pair, an integrator circuit to reconstruct the wire current. There will be a signal inversion when the data direction changes. It has to be eliminated in the decoder hardware.
 

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