POS system and printing device

A POS system comprising:

• a first terminal having a first controller configured to run a first browser that generates first display data and second display data by a first script, a first interface configured to transmit the second display data, and a first display configured to display the first display data;
• a POS server configured to transmit product information corresponding to barcode information to the first terminal when the POS server receives a request corresponding to the barcode information from the first terminal;
• a printing device having a communicator configured to connect to the first interface of the first terminal and a device communicator configured to communicate with a barcode scanner;
• and
• a second terminal having a second interface configured to connect to the communicator of the printing device, a second controller configured to run a second browser that processes the second display data received by the second interface, and a second display configured to display the second browser by a second script as a customer display, wherein
• the barcode scanner is configured to scan a barcode and transmit a result of scanning to the device communicator,
• the device communicator receives the result of scanning, generates the barcode information based on the result of scanning, and outputs the generated barcode information to the communicator,
• the communicator receives the barcode information and transmits the barcode information to the first interface,
• the first interface receives the barcode information, the first browser generates the first display data including an input field based on the barcode information, the first controller displays the first display data on the first display, the first display data rendering a user interface for a user on the first display, the first interface transmits the second display data to the communicator,
• the communicator receives the second display data and transmits the second display data to the second interface,
• the second interface receives the second display data,
• the second controller displays the second display data on the second display, the second display data being viewable by a customer,
• the second display data include data specifying a first display area of a user interface displayed on the second display and information to be displayed in the first display area,
• the first interface transmits the request corresponding to the barcode information to the POS server when the first interface receives the barcode information from the communicator,
• the first browser generates the first display data based on the barcode information and the product information when the first interface receives the barcode information from the communicator and the product information from the POS server, and
• the printing device includes a print mechanism configured to print based on print data in an XML-compliant format transmitted from the first terminal.