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Consult, serial return value has three, how do I take first? With easy language.

Time:03-21





With easy language,
Command line: debug output text (data byte value), is used to show a return value of single chip microcomputer,
Output data byte is:
50
13
10
But only the first one is I want to use, how do I only in the edit box shows the first 50, don't back two? Display is 501310 now,