关键词:Modbus、城市公交、客车空调、控制器
Abstract
In recent years, With the number of private cars increased dramatically, road congestion increased dramatically,more and more people select a city bus as their travel tools .Urban public transport in urban transport in China occupy an important position , It has urban residents with the production, life and other activities closely related to the system , and the bus air-conditioning systems have a direct bearing on the passengers in comfort. With the development of domestic industries bus, the demand of air-conditioning systems is increasing. As air-conditioning systems core components control, the performance of the controller also has a higher demand. Its work requires not only reliable, but also for the aesthetic appearance, HMI friendly. Modbus Protocol is a common language used in electronic controller. With this agreement, between controller, controller can communication with other devices through networks (such as Ethernet).It has become a common industry standards. Different manufacturers' control equipment can be connected into industrial networks and centralized monitoring with it. The agreement defines a controller able to use the information structure, regardless of what they are after the communications network. It describes a controller requesting access to the other equipment's process, how to respond to the request from other equipment, and how to detect errors and records. It developed a pattern and content of news domain of public format. Modbus communication protocol will be as the means of communication between the air-conditioning and controller, improve the accuracy of the information transmission, in the same transmission rate could be more than the other way transmission of information.
Keywords:Modbus、Urban public transport、Bus air-conditioning、Controller