How to transform a +16/-20V pulse to digital?

Hi guys,

I need a circuit for a rev. counter that can transform this (+16/-20 V) input pulse to a logic high for a digital input.

https://preview.redd.it/zfv8tftt2q4f1.png?width=1688&format=png&auto=webp&s=9b6763e297a557b4e7315a45afd4fed30dfdc0ee

I came across this simple Zener + Schottky diode circuit, but I wonder if it would do the trick (btw, R1is required by the pulse generator circuit).

https://preview.redd.it/zafma6ru2q4f1.png?width=723&format=png&auto=webp&s=827c5cfb43d69bc6779377ecb0672a9de5ad0a1f

Any thoughts?

Thanks!