Help me for use MasterModbus in Greenhouse automation project !

hello guys ! im a newbie in arduino but im high end in avr and arm programming :) i wanna your help for use MasterModbus in my greenhouse automation ! in my project i have just 2 slave for logging data from sht10 module and send it via rs485 to one master in control unit ! i use 3 arduino uno for this porpuse ! but my problem is im confused about use this library ! i study document in github of this library but im still confused because im not familiar to arduino IDE and its language ! plz help me to how make a master ! sampling slave vica versa and simoustanly ! whats the code in slave part ! ???? thx a lot