Arduino with NRF24L01. Getting correct data from unkown transmitter
Don't have full details yet. But the VAC8010F uses modbus RS485 protocol.
My research shows that the NRF24 just transmitts and receives the MODBUS protocol to and from master/slave. I have found modbus libs and samples of code on the net. There is a command driven program to communicate with MODBUS free for linux, which is the o/s I use. I don't know about win. Anyway, once I receive the MAX485TTL interface for my ARDUINO MEGA I will write code for data  logging to p.c. then modify to use the NRF24, as I should be able to extract the ADDRESS, and CHANNELS etc, and packet construct.
Hope this is of some help.
Patrick