How to do a proper Modbus Data Acquisition and display

I don't have the appearance of buttons under my mouse pointer when i over hover a debug message.

I mentionned the version of my NodeRED at the top of my topic which is versions away in my opinion of the version you got, giving the possibility to do this.

I wanna have more information to know how to acquire the hexa variable i've put in a buffer that i wanna turn into a global variable so i can split the informations contained in the Modbus frame and display them properly instead of having values in brackets .