Point-of-sale printer interpreting a markup language from a client device to control a scanner using scanner-control commands

摘要

A device control system has a terminal 3 with an application 31, and a printer 5 that controls a scanner, or other device. The terminal 3 sends a request written in XML generated by the application 31. The printer 5 receives the XML request, and the terminal 3 receives an XML response. If the terminal 3 requested control of the scanner in the XML request, the terminal controls the scanner.