Thank you Dear
chipfryer27 , RGV250
you guide me on avery good way
i alrdy make GUI program in HMI and Know the data send format and value my problem was in how to recive it in my Arduino using Flowcode
i will study about Circular Buffer and give you feedback soon .

i need help to read hex data format
i have Dwin HMI touch screen i use it with arduino Uno
i succed to send data to HMI to control of it
but i cant understand how to deal with data send from HMI to Arduino
it is in Hex format like This
(0x5a 0xa5 0x06 0x83 0x00 0x01 0x01 0x00 0x02)
i bulid coode ...