Commenting here on your comment in the other thread (accidental mixup threads?)
always with modpol I can activate the relays simply by pointing the word and modifying the single bit
I am not aware of such functionality of setting single bit inside a word (=16 bit register) with modpoll. As explained above
The reason for all of this is that there is no way to write individual bits to registers with modbus (protocol). You can only write whole 16 bit registers.
Since modpoll just exposes pure Modbus protocol, it has no way of having that feature.
Can you share your modpoll command, I think there is mixup here still. It’s quite straightforward to convert modpoll read/write commands to relevant modbus binding configuration.