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I have a project that will tap into an existing sensor that uses a 4-pin M12 A-Coded connector. My plan is to use a Y Splitter to allow me to tap a parallel connection to the sensor.

The splitter I have found uses 5-pin A-Coded connectors. Finding a FMM splitter has been a challenge, I haven't found a 4 pin version.

Connecting the the 4-pin sensor to the female 5-hole connector is no problem, but my concern is that the cable that is currently attached to the sensor is likely a 4 conductor cable. If the cable's connector doesn't have a dummy center hole it won't fit on the splitter. I'll have to replace the connector.

All the 4-conductor cables I've examined or seen images have a dummy center hole, is that actually part of the standard?

This may be for a large number of installations, so I won't know ahead of time each situation.

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Cut off the center pin of the male connector in the Y splitter.

The cable that is currently attached to the sensor is likely a 4 conductor cable.

It is.

All the 4-conductor cables I've examined or seen images have a dummy center hole, is that actually part of the standard?

It is not.

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