title: How to print barcode with running number ZPL-II?
body: <p>I have a simple program print barcodes. The label format is in a preloaded form.
  The value the barcode is passed by a parameter as follow.</p>
  
  <pre><code>^XA
  ^XFR:FORM.ZPL
  ^FN999^FDH654321+Y0001+OABC+^FS
  ^PQ2,0,1,N
  </code></pre>
  
  <p>And it print two barcodes</p>
  
  <pre><code>H654321+Y0001+OABC+
  H654321+Y0001+OABC+
  </code></pre>
  
  <p>What I want is the middle part as a serial number, and it will print barcodes like this</p>
  
  <pre><code>H654321+Y0001+OABC+
  H654321+Y0002+OABC+
  </code></pre>
  
  <p>I have tried the ^SN and ^SF</p>
  
  <pre><code>^FN999^FDH654321+Y0001+OABC+^SF%%%%%%%%%dddd%%%%%%,1%%%%%%^FS
  </code></pre>
  
  <p>But it was not success, two copies are the same. How can I do it in ZPL-II?</p>