(1) The serial frame format and serial port rate can be set arbitrarily in the wired connection communication program. The connection line itself has no restrictions on the above two parameters. In the wireless module, these two parameters are a fixed value, so these two parameters should be consistent with the settings of the wireless module. The STR-6 wireless transceiver module communication implementation method: the wireless module A first sends a handshake signal to the opposite party wireless module B before transmitting the data, and the wireless module B feeds back a response signal after receiving the handshake signal. If the wireless module A does not receive the correct feedback response signal, it indicates that the two parties have not established the wireless communication connection normally, and the wireless module A continues to send the handshake signal until the feedback signal is received. After receiving the feedback signal, the wireless module A starts transmitting data. Based on the accepted information, the wireless module B stores the data in the path specified by the user to complete the entire wireless communication process. Previous page Ptfe Membrane Filter,Nylon Membrane Filter,Polypropylene Membrane Filters,Pvdf Membrane Filter Dongguan Boye Instrument & Machinery Equipment Co., Ltd , https://www.boyelab.com
(2) When a wired connection occurs, there is no time interval between the time when the originating end sends data and the time when the receiving end receives data. The wireless module performs transmission and reception conversion and clock synchronization when transmitting data, so there is a time interval between the time when the master device sends data and the time when the slave device receives data during wireless communication.
(3) Serial communication is full duplex when wired. The communication of the wireless module is two-way half-duplex. Therefore, control should be performed during communication programming to shift the time of sending and receiving.
For today's open CNC systems, standard and powerful wireless communications are supported with a common operating system. At present, the operating systems used in open CNC systems at home and abroad are based on DOS and the other is based on Windows 98/NT. DOS is a single-tasking operating system running in 16-bit real mode. It has good real-time performance, but it is limited by 16-bit real mode. It is difficult to achieve efficient and reliable network, especially wireless network communication. Windows98/NT is powerful, but the system is powerful. The structure is huge, the real-time performance is poor, and it cannot meet the numerical control requirements. Windows CE.NET is a new generation of embedded operating system introduced by Microsoft. It has strong real-time performance and combines the advantages of DOS and Windows. It is a small and sophisticated system. It is a completely open modular architecture supporting Bluetooth and 802.11x wireless. Communication protocol and friendly graphical interface. Considering that Microsoft's products have more technical support and available resources, combined with our research foundation and application experience for several years, we chose it as the operating system platform of the embedded machine tool controller of the new CNC system. The hardware uses a 104-bus industrial control board plus an 802.11x wireless network card to enable wireless communication with the CNC PDA wireless module.
2.3 STR-6 wireless data transmission module introduction
We use the STR-6 wireless transceiver module produced by Shanghai Sambo Technology Co., Ltd. as the wireless communication between the CNC PDA and the RS-232 serial port of the traditional CNC machine tool. It has the advantages of micro power transmission, high anti-interference ability and low error rate, long transmission distance, multi-channel, large buffer. It provides standard RS-232, RS-485 and UART/TTL level interfaces for direct connection to computers, user RS-485 devices, microcontrollers or other UART devices. With two computers connected to the STR-6 wireless transceiver module, wireless transmission can be achieved within 500 meters. The working principle diagram of the wireless module is shown in Figure 6. 
in conclusion
Digitalization of the workshop is an important part of the digitalization and informationization of the enterprise, and it is also a difficult point we face. It is unrealistic to seek to eliminate people's participation and rely solely on computers and automation technologies to realize digitalization and informationization in manufacturing. Only by introducing the current wireless and mobile communication technologies into the manufacturing industry, information acquisition and human-machine communication can be realized anytime and anywhere, and human intelligence and machine intelligence can be seamlessly combined to form a human-centered human-machine synergy. Manufacturing model can really achieve this goal. The development of a new CNC system with digital PDA function using wireless communication technology will lay a solid foundation for realizing this new manufacturing mode.