You won't see the data as it is not ASCII it is non printable characters the 01hex = start of heading ,02hex is start of text and 03hex is end of text. change the data to 31 hec ,32 hex and 33 hex and see it it displays on your terminal program.
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FYI: some terminal programs (RealTerm, for example) allow you to display hex values rather than ASCII. In case you wanted to verify that the correct non-ASCII data is being sent.