Ok.
My project created on windows 7 but pascal scada can be work on linux too.
You need a modbus device on my project my modbus device was modsim software.
I contact two software by com0com project.
So if you look at project you will see a com port connector, a modbus protocol component, a tag number component and a modbus block component.
But you have to connect this components with by a tag bit for bit states and a blockelement for analog values.
Also Analog values can be scale 0..100 like as. I used linearscale componet.
So modsim running on COM7 and my project running COM6 and checked com port component as active
Thats all.
Note: I can't add whole pictures in one message but you can solve.