When you have trouble typing in a non-printable character to encode, do NOT worry.
Launch Barcodesoft encoder, the same solution as HTML number is used to input non-printable character.
For example, 4; represent < ET >,
28; represent < FS > ;
29; represent < GS > ;
30; represent < RS > ;
31; represent < US > .
Actually, you can also input printable character in this way, if you feel like the hassle.
Here is a list of non-printable ASCII characters.
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