hello all, i am implementing modbus protocol for HMI touch screen display with LPC2148. i have written my code and it is working fine. i am facing problem is function code of 0x10. i get query and i response. upto this it is fine but after responding HMI again gives me 01 00 00 DF (DF can be any 8bit number but 01 00 00 is constant). pls explain me what it is. thank you reagards
What is this "HMI" that you keep on about?
Is it something that you've written yourself, or is it from some 3rd party?
If it's something that you've written yourself, then it's obviously up to you to debug what you have written!
If it's from some 3rd party, then you should contact them for support - maybe they intended it to work that way...?