Trouble protocol HMI

Hello I need help

I want conect and control digital servo Hitec to Atmega rs232 protocol with use HMI protocol, but i dont enough informations about HMI protocol. Do you send me some informations about HMI, or any program in C for Atmega controler. Especially interested me times, between bytes and how many times be 0 or 1 in start and end communication.

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THX from links, are very helpful :slight_smile: