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raspberry pi voltage rs-232 (uart)

Judging by the oscilloscope readings, your sensor uses RS-232 levels. That's NOT compatible with the Pi, which uses 3.3V for input/output. If connected directly, your Pi may either fry instantly, or ...
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raspberry pi voltage rs-232 (uart)

You have not provided details of the sensor BUT if it uses RS232 you will require a RS232 converter. RS232 is up to ±15V, although most devices which claim to be RS232 use much lower voltage unipolar ...
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raspberry pi voltage rs-232 (uart)

As @joan written, Raspberry is using 3.3V logic, therefore your sensor must be also with 3.3V logic. If your sensor is using 5V logic, you can use for example following bi-directional converter: https:...
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raspberry pi voltage rs-232 (uart)

The Pi UART (GPIO 14/15) requires 3V3 for high and 0V for low. If your sensor works at those voltages you will be fine. If your sensor does not work at those voltages you will need to add circuitry ...
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