| This paper introduces the research and design of short distance WLAN based on nRF401 wireless communication chip which use bluetooth kernel technology. At the same time we apply this wireless network to the research and design of wireless order system of restaurant.This paper explains the principle of wireless communication., DDS, PLL, wireless chip nRF401 and wireless module PTR2000. The instance(wireless order system of restaurant), of WLAN(Wireless Local area Network) in this paper consists of some wireless terminals and a server. Wireless termial consists of 2051 singlechip, keyboard, LCD, extended RAM and peripheral apparatus.Because the system includes some wireless terminals and a server ,in order to implement one to many communication of the whole wireless system we design wireless communication protocol. The protocol consists of physics layer , link layer and application layer.CRC checkout is used to carry out checkout of data during wireless transportation.Hardware of the server consists of PC, PTR2000 and peripheral apparatus. Software of the server was developed by VC6.0. The software of the server consists of the module of serial communication ,the module of resolution, the module of management and the module of print. We use multithreading which can ensure synchronous running of all modules to develop the software of the server. The software of the server have the function of creating database and table dynamically. We construct a serial communication clsss to read and write the port of serial communication. When we handle the port of serial communication , we call interface functions of the serial communication clsss. The module of resolution carry out resolution of operation data . The module of management is in charge of management of whole system.Wireless order system of restaurant designed in the paper is a new mode ofservice of restaurant. It is innovation of service of restaurant. The communication protocol designed in the paper fulfill need of system. |
PDF Full Text Request