Configuration of modbus binding

Hello. I have a workflow engine named CONNECT I/O which contains a modbus server. I want to connect openHAB to it using modbus binding. I have tested Modbus Poll (see and it works, so I can switch states there and see them in CONNECT I/O. My Connection Setup (in modbus poll) is “Modbus TCP/IP”, IP address, Port 502, IPv4.
Connecting to this modbus server from openHAB does not work.

My modbus.cfg file has this content:

My items file containts the line "Switch ALightSwitch “Light” (roomA) {modbus=“slave1:0”}
When I change a state there, I don’t see it in my workflow engine and I don’t know why. Can you help me?

p.s. I use modbus 2