I fhave already tested it whit the "simplemodbus" sketch.. No problem there...
The point is that i dont want to spend too much time learning something proprietary i need only one time. Coding on the arduino is more usefull for me, but it already worked how it shoult so no worry about modbus. i tried whit 50ms sequences on 19200.. Thats more than fast enough.. I think i go whit 9600 and 200ms, is fast enough and probably more stable..
But if you now a good alternative please let me hear.