[Solved] ModBus and cheap 4 relay module (D18994)

[rossko57]

I think you can use the newly updated Modbus binding version

Modbus support for transformations, roller shutter items, read-only items, write-only items, and others

Update: This feature is now part of modbus binding 1.10.0. Hello everyone! Originally discussed in here, there has been a need for having transformation support for opnehab. Some of the more complicated use cases (e.g. rollershutter items) could be implemented simply using transformations. I have been implementing this support for a while now, and feel confident sharing the first test version with the community. Along this update comes support for writing to different address based on the co…

A trsnsformation of Openhab Switch Item ON/OFF to Modbus holding register number values should be possible.