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在S7-300控制系统中,通过性价比极高的S7-300控制器,完成与带串口的无线接收设备的串行通讯,实现Modbus RTU master/slave的数据包发送和接收。在实际项目中的应用证明,该方案不仅比原先使用的Siemens公司的串口通讯模块和配套的协议驱动模块更加经济,而且可以保证通讯稳定可靠,值得在以后的项目中借鉴使用。
In the S7-300 control system, through the S7-300 controller with high cost performance, serial communication with the wireless receiving device with serial port is completed, and the data packets sent and received by Modbus RTU master / slave are realized. The application in the actual project proves that the scheme not only is more economical than the originally used serial communication module of Siemens Company and the associated protocol-driven module, but also ensures the stable and reliable communication and is worth to be used for reference in future projects.