Many thanks Paul and Elf for your reply.
In the meantime, I spent all my evening studing and testing the “Get” instruction, and I successed.
To read a nextion number variable var1, whose content is 600 and located on page1 : my Picaxe must send for example :
Serout SortieNextion,T9600_16, (“get page1.var1.var”,255,255,255)
The Nextion reply is : 113,88,2,0,0 (in decimal, I prefer than in Hex)
113 is the Nextion Code of the decimal reply ($71)
88 is 600 mod 256
2 is 600/256
0,0 are used only on greater variables. Nextion allows to send up to 4 bytes numbers.
To read a nextion Button Caption Bn1, whose caption is “ON” and located on page2 : my Picaxe must send :
Serout SortieNextion,T9600_16, (“get page2.Bn1.txt”,255,255,255)
The Nextion reply is : 112,79,78 (In decimal)
112 is the Nextion Code of the text reply ($70)
79 is ASCII of the character “O”
78 is ASCII of the character “N”
One more time, thanks for the replies. I go on to my heating control project.
Maybe, I posted my messagein the wrong Thread. If somebody can move it…