title: Ascii convert to HEX
body: <p>I have a command file with this format:</p>
  
  <pre><code>31 01 FD 37 04
  31 01 FD 37 05
  31 01 FD 37 06
  31 01 FD 37 07
  </code></pre>
  
  <p>This commands are in ASCII but i have to send my device same numbers just in HEX
  so: <em>31 01 FD 37 04</em> <strong>-></strong> <em>31 01 FD 37 04</em>  <strong>NOT(33 31 30 31 46 44 33 37 30 34 )</strong></p>
  
  <p>Any idea?</p>