Design and Application of Wi-Fi in the Data Collection of Public Transport Toll System With the application of non-contact IC card technology in urban bus automatic toll collection systems, vehicle-mounted POS machines are widely used in bus toll collection systems. In recent years, the proportion of customers with card consumption has been increasing, and the number of POS machines on board buses has also continued to increase. At the same time, they have put forward higher requirements on the bus toll collection system. At present, bus companies around the country have basically established a traditional POS system with wired access, and some GPRS / Zigbee wireless solution pilots, but with the development of technology, the shortcomings of the existing bus POS system data collection have further emerged. The wired access of the bus POS machine requires the staff to read and store the data of the car POS machine to the data collection center through the data collector after the bus returns to the main station. The involvement of personnel makes the collection process inefficient and error-prone, and maintenance is more complicated (see Figure 1). On the other hand, due to the large number of buses and frequent network interactions, it is impossible to bear high operating costs, such as paid communication services such as GPRS, CDMA, etc., more of which can only be used as long-distance backbone network connection services, not as A comprehensive coverage of the bus charging network. We compare several wireless data transmission methods as follows (see Table 1). The wireless communication and network technology carried by WI-FI just perfectly fill this gap. The rising boom in Wi-Fi network construction has made Wi-Fi the mainstream of wireless networks. From the aspects of safety, technological maturity, connection with existing networks, node management, QoS characteristics, and device interoperability, Wi-Fi has unparalleled advantages in short-distance wireless technology, which can maximize the satisfaction of public transportation. The demand for data collection of the charging system. Beijing CLP Huada Electronic Design Co., Ltd. (hereinafter referred to as Huada Electronics), based on the current rapid development of wireless network data services, proposed a wireless POS machine access solution based on Wi-Fi technology. The wireless access method of POS machine based on Wi-Fi technology can perfectly solve the shortcomings of traditional bus wired POS and existing wireless data transmission. Using Wi-Fi wireless access technology, when the bus enters the main station, the vehicle-mounted POS machine is automatically connected to the wireless AP / Router installed at the main station. The AP can be connected to the data collection center through Ethernet. After the association is completed, the vehicle POS machine will automatically upload the data stored on the POS machine to the data collection center, and wirelessly download the blacklist and other content to be downloaded to the vehicle POS machine. This process does not require the data collector to transfer data, nor Staff participation. Multiple Wi-Fi vehicle-mounted or handheld POS can be connected to the bus toll collection system through the AP in a shared manner to communicate with the data collection center. Customers can flexibly choose the location and number of APs to adjust the coverage according to the actual situation of the main station. The use of Wi-Fi wireless access technology makes the bus toll collection system data collection more intelligent and easier to maintain (see Figure 2). Wi-Fi wireless data transmission has the characteristics of low equipment cost, highly safe and reliable data transmission, flexible and convenient use, etc. It is very suitable for applications on POS machines. The Wi-Fi operating system can be upgraded remotely through the network. It is very flexible and convenient. It can provide a wide area wireless IP connection. It is suitable for industrial and enterprise users to carry out wireless data applications, and provides high-performance wireless access for distributed remote access points . Main features of Wi-Fi: 1. Long transmission distance and large coverage. A single AP coverage can reach 10,000 square meters 2. High transmission rate. The speed can reach 11Mbps. 3. The system transmission capacity meets the requirements. Wi-Fi technology is particularly suitable for POS systems that need to transmit large amounts of sudden data. 4. High security. Provide "safe multi-mode" capability, support WAPI / WEP / WPA / WPA2 security standards, security standards can be configured through software. 5 Good scalability. Considering the future business growth and changes, it should have sufficient scalability, including the provision of multiple access methods and the scalability of access, the expansion of bandwidth and the smooth upgrade of rate, and the scalability of processing capacity, relying on The mature technology brought by the Wi-Fi network being deployed on a large scale, various endless Wi-Fi devices, existing network facilities, architectural support, and rich network knowledge, the use of Wi-Fi can be minimized Adjustments to network architecture and existing equipment. The wireless module interface customized by Huada Electronics according to the bus toll collection system is simple and easy to use. Customers will no longer need to pay attention to the details of wireless technology, but directly and quickly enter the practice of wireless product development, which greatly speeds up the progress of product development and achieves With an easy transition from wired to wireless technologies and products, the current wireless bus system based on BGI WLAN technology has been deployed in several large and medium-sized cities in China and has achieved good operational results, which have been unanimously recognized. ZGAR Vape Pods 6.0 Series ZGAR electronic cigarette uses high-tech R&D, food grade disposable pod device and high-quality raw material. All package designs are Original IP. Our designer team is from Hong Kong. We have very high requirements for product quality, flavors taste and packaging design. The E-liquid is imported, materials are food grade, and assembly plant is medical-grade dust-free workshops. 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