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With the application of non-contact IC card technology in the automatic toll collection system of urban public transportation, a large number of on-board POS machines are used in the public transportation toll collection system. In recent years, the proportion of customers holding cards for consumption has increased, and the number of on-board POS machines on buses has also continued to grow. The growth has also put forward higher requirements on the bus fare system. Currently, public transportation companies in various parts of our country have basically established traditional POS systems with wired access, as well as some GPRS/Zigbee wireless scheme pilots. However, with the development of technology, the shortcomings of the data collection of existing public transportation POS systems have further emerged.
The wired access of the bus POS machine requires the staff to read and transfer the data from the on-board POS machine to the data collection center through the data collector after the bus returns to the terminal. 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 expenses. For example, paid communication services such as GPRS and CDMA can only be used as long-distance backbone network connection services. Full coverage of public transportation toll network. We compare several wireless data transmission methods as follows (see Table 1).
The wireless communication and network technology carried by WI-FI perfectly fills this gap. The rising upsurge of Wi-Fi network construction has made Wi-Fi the mainstream direction of wireless networks. In terms of security, technological maturity, connection with existing networks, node management, QoS characteristics, and device interoperability, Wi-Fi has unparalleled advantages in short-range wireless technology, which can satisfy public transportation to the greatest extent. The demand for data collection in the charging system.
Beijing Zhongdian Huada Electronics Design Co., Ltd. (hereinafter referred to as Huada Electronics) based on the current rapid development of wireless network data services, proposes a bus wireless POS machine access solution based on Wi-Fi technology. The wireless access method of POS machines 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 terminal, the on-board POS machine is automatically associated with the wireless AP/Router set up at the terminal, and the AP can be connected to the data collection center via Ethernet. After the association is completed, the vehicle-mounted POS machine automatically uploads the data stored on the POS machine to the data collection center, and wirelessly downloads the blacklist and other content that needs to be downloaded to the vehicle-mounted POS machine. This process does not require a data collector to transfer data, and there is no need to Personnel participation. Multiple Wi-Fi vehicle-mounted or handheld POSs can access the bus toll system in a shared manner through APs, and 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 data collection of the bus toll system more intelligent and easier to maintain (see Figure 2).
Wi-Fi wireless data transmission has the characteristics of low equipment cost, highly secure and reliable data transmission, and flexible and convenient to use. It is very suitable for applications on POS machines. The Wi-Fi operating system can be upgraded remotely through the network, which is very flexible and convenient. It can provide a wide-area wireless IP connection. It is suitable for industry and enterprise-level users to develop wireless data applications and provides high-performance wireless access for scattered remote access points. .
Main features of Wi-Fi
1. Long transmission distance and large coverage area.The coverage area of a single AP can reach 10,000 square meters
2. High transmission rate. The speed can reach 11Mbps.
3. The transmission capacity of the system meets the requirements. Wi-Fi technology is particularly suitable for occasions such as POS systems that need to transmit a large amount of burst data.
4. High security. Provides “safe multi-mode” capability and supports WAPI/WEP/WPA/WPA2 security standards, which can be configured through software.
5 Good scalability. Considering future business growth and changes, it should have sufficient scalability, including the provision of multiple access methods and access scalability, bandwidth expansion and rate smooth upgrades, and processing power scalability, relying on The mature technology brought by the Wi-Fi network being deployed on a large scale, the endless variety of Wi-Fi equipment, the existing network facilities, the architecture support, and the rich network knowledge, the use of Wi-Fi can be minimized Adjustments to the network architecture and existing equipment.
The wireless module interface customized by Huada Electronics according to the bus toll system is simple and easy to use. Customers will no longer need to pay attention to the details of wireless technology, and directly enter the practice of wireless product development, which greatly accelerates the progress of product development. With the easy transition from wired to wireless technologies and products, the current wireless public transportation system based on Huada Electronics’ WLAN technology has been deployed in several large and medium-sized cities in China and has achieved good operating results and has been unanimously recognized.
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