In recent years, with the development of high precision and comprehensive automation in various industries, robot arms have been widely used. Robotic arm is currently available in addition to the assembly and handling of the workpiece can also be applied to the complex surface of the workpiece precision machining and use to the medical precision surgery and automated production line. Therefore, the real-time information and accuracy detection of robots is very important issue, and the performance of the product will affect the quality and safety of the product. At present, robotic arm information is drawn through industrial communication protocols such as dynamic links, OPC UA, MTconnect and Modbus. This paper will compare the differences and uses of industrial communication protocols and use the communication protocol to perform robotic information coordinate reading and positioning accuracy measurement applications.