That's complicated: if you mean you want to send 5 bits per character as text-type data, then look at using
Base64[
^] - depending on what your framework is, there are various ways to convert to / from base64:
Google: Base64[
^]
If you apop uses the .NET framework, then these are available:
Convert.ToBase64[
^]
Convert.FromBase64[
^]