Schematics – Meaning of the ‘Lasso Loop’ on Circuit Diagram

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I've never seen this "loop" structure in a circuit diagram before.

  • Pin 6 has a line that loops around the lines from pins 5 and 9.

  • Pin 7 has a line that loops around all other lines, except the ?resistor? between pins 1 and 6.

Nellcor Pulse Oximeter Pinout

NOTE: This pinout diagram is for the db9 connector on a Nellcor Pulse Oximeter

Best Answer

The loops represent a shield around cable that then connects to the connector pin indicated by the line from the loop.

In your example there is a two wire pair that is shielded and then that is contained with some other wires and an overall outer shield.