Network Inquiry And Control System To Controlmonitors Based On Modbus/RTU Protocol Convertor

Field bus technology has been widely used in control system design of industrial manufacturing nowadays. The traditional mode of distributed control and computer layered control was gradually substituted by the mode of intelligent terminal and network control. This technology combined the development of process control, automation instrument and computer network technology. Howerver, the existing of multi-bus and incompatibilities in the communication protocol was a common problem.On the basis of the study fieldbus communication protocol——MODBUS protocol, aim at the remote monitoring project of the TianWei Group, whose communication protocol has differences between the PC and field devices, a communication protocol conversion processor based on ARM+uCLinux Embedded Platform and an Remote-inquiry terminal based on Windows platform were presented. Embedded system, SOCKET, multi-threading technology were used and data exchange freely between PC and field devices were realized. Futhermore, a problem that the the number of monitoring equipment one RS485 interface can drive in practice is much less than that in theory, can be resolved in this way. This system is a complete protocol-conversion remote monitoring system, and has been tested in the actual project. Practice has proved that this system is reliable and low-cost.At last, an in-depth discussion on the way of realizing the system by Web was given. And considering the characteristic of the project, a Web Sever scheme relized by C Language was proposed.