help to get value from energy meter spm91 using modbus-rtu and rs485

hi all,
im newbie here, i need help please,

i have a tools energy meter SPM91 DIN Rail single phase energy meter with specification like this :

  1. 35mm DIN installing, in accordance with standard DIN ED50022
  2. high accuracy, active energy accuracy up to class 1
  3. measure and display V,I,P,kWh value
  4. 6+1 digits LCD display (999999.9 kWh)
  5. passive pulse output, output signal is in accordance with standard DIN43864
  6. LED indicates pulse
  7. key-press for local prameter setting
  8. RS485 communication port, modbus-rtu protocol

I want to get value added to arduino, but i dont know how to make program for it,

I know all the master arduino gathered here, please guide me how to get the value for send to arduino, please :cry: :cry:

this image energy meter i use,

and this

i have same problem, i think this site is good for you http://puaks.blogspot.com/2018/02/arduino-uno-vs-sdm120.html :o