title: Communicate with POS terminal via PHP
body: <p>Any idea how can PHP communicate with POS terminal? Communicate = read data, read status, write data (send amount that the customer have to pay).</p>
  
  <p>The main idea is at the end all that the customer have to do is writing his PIN and push the OK button.</p>
  
  <p>PHP and the POST terminal are connected in the same network. The POS terminal can be connected to the Linux machine with serial cable if this is necessary.</p>