title: ZPL command barcode 3 zeros creates issues
body: <p>I am trying to print to a GT800 Zebra printer thru serial port. 
  I am using ZPL. I want to control the width which is fine in auto mode. To address that in the >^BC> command I am using Auto mode as no other size setting under ^BY works
  Following is the code</p>
  
  <pre><code>^XA
  ^MMT
  ^PW831
  ^LL400
  ^LS0
  ^BY2,,76^FT225,141^BCN,76,Y,Y,N,A
  ^FD:RNIP29200082034^FS
  ^FO225,157^A@N,18,10,E:CAL002.FNT^FD26030-0892R^FS
  ^FO383,157^A@N,18,10,E:CAL002.FNT^FD08.01.20 12:00PM^FS
  ^FO225,187^A@N,18,10,E:CAL002.FNT^FDLAMP-DR RH^FS
  ^FO453,187^A@N,18,10,E:CAL002.FNT^FDXBA3^FS
  ^PQ1,0,0,Y
  ^XZ
  </code></pre>
  
  <p>There is a funny problem. If the <code>^BC mode = A</code> then if three zeros come together gives issues for eg ABCD29200082034 it prints ABCD29200 and does not complete the barcode. But the other lines are getting printed. But if the data is  ABCD29200182034 , there are no issues. 
  If <code>BC mode = U</code> then even if the code is ABCD29200182034 it prints 292001820347. Note 7 is added in the end.
  I am clueless as to what is this issue. I remember facing this same issue in Honeywell printer too once.
  Thanks 
  NOTE : I replaced the 000 with 111 and the problem persists. 
  ZPL Manual says the following</p>
  
  <blockquote>
    <p>A= Automatic Mode :This analyzes the data sent and automatically determines the best packing method. The full ASCII character set can be used in the ^FD
    statement — the printer determines when to shift subsets. A string of
    four or more numeric digits causes an automatic shift to Subset C.</p>
  </blockquote>
  
  <p>Note , it says a string of four or more numeric digits causes an automatic shift to subset C, but when the same string is 290010 it has no issues. I am really lost </p>