Arduino Mega - sending commands via RS232

[StefanL38]

So the next step is to read the serial input basics tutorial

Serial Input Basics - updated

Updated Version Please note that this is a revised version of the advice in this earlier Thread which has become very long. As far as possible I have kept the code examples identical or simplifed them slightly. It should not be necessary to refer to the older Thread, but feel free to do so. Contents The following sections are in this Tutorial Introduction Serial data is slow by Arduino standards Example 1 - Receiving single characters Why code is organized into functions Exampl…

which has a demo-code that shows how to use start- and endmarkers
which in your case are the "02" and the "03"
to receive the characters into an array and then you can pickout the bytes for further processing the data