I’ve written a guide on bitwise working with openHAB and Modbus.
Reading individual bits is straightforward. Start with something simple like a read only register.
Writing bits is complicated - that’s due to how Modbus works, not openHAB.
Using individual bits in registers is an odd design choice, given that Modbus provides a way to address individual bits anyway. But we have to work with what we’ve got.
I’m a bit worried about the talk of “pulse” in the chart you have shown us. Are these bits you have to turn on and then turn off again?