Note: The error pointed out by Per in the original post has been corrected.

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What, exactly, do you mean by "translate ASCII to binary"?

ASCII is just a code that uses numbers to represent - or encode - characters.

eg, when you want to send the uppercase letter 'A' you send its ASCII code value - which is sixty-five.

The numeric value sixty-five can be represented many ways; eg,
in decimal as 65;
in hexadecimal as 41;
in octal as 101;
in binary as 1000001;
in Roman numerals as LXV;
etc.

It looks like what you're actually trying to do is to transmit a value in hexadecimal notation, eg, 40, by sending the character '4' followed by the character '0' - is that right?