6
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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

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16
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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.

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  • \$\begingroup\$ Follow up question, should the shielding be connected to ground? \$\endgroup\$ – Zak Aug 28 '18 at 1:00
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    \$\begingroup\$ The shields should be connected to the pins shown in the diagram. \$\endgroup\$ – Peter Bennett Aug 28 '18 at 1:15
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    \$\begingroup\$ No. The schematic is for a connector, cable and sensor assembly. Appropriate connections for the shields are determined by what is on the other side of the D-9 connector pins 6 and 7. \$\endgroup\$ – Michael Karas Aug 28 '18 at 2:42

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