My current doorbell is an old Legrand bell (type unknown, no manual available).

I want to install my new D235 wired and continue to use the old chime, and I'm wondering if this is possible?

In the photo: between 1 and 2 = 238V... between 3 and 4 = 10.6V (the push button is currently connected to this)... between 4 and 5 = 10.6V.

Do I need to install a bypass somewhere, and to which terminals should the D235 be connected?

Thank you for your input!