Simons Voss Technologies SmartRelay 3 reader Guide Abrégé page 28

4. Connections
Ground loop through shielding
Remote devices may have a slightly different ground potential. A shield connected on
both sides represents a second ground connection through which this potential differ-
ence is compensated. The resulting current flow can interfere with the data transfer.
Only connect the screen on one side to the common ground potential, e.g. on the
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reader (WP variant: Shield is led out on reader side together with ground).
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SmartRelay 3 reader
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