Three aspects of RS 485 application, which affect the reliability of communication of data system are analyzed and discussed. In network configuration, it presents the optimal configuration for the bus of RS 485, the ...Three aspects of RS 485 application, which affect the reliability of communication of data system are analyzed and discussed. In network configuration, it presents the optimal configuration for the bus of RS 485, the better rule for derivative line and the choice for termination. In hardware design, it presents three parts of driver’s peripheral circuit. In control software design, it presents a method of using 75176’s DE line to control the driver.展开更多
Power loss sometimes needs particular consideration in coal mine. This paper analyzes the main three parts of power consuming of RS 485 system, that is quiescent power consuming, transmission power consuming and perip...Power loss sometimes needs particular consideration in coal mine. This paper analyzes the main three parts of power consuming of RS 485 system, that is quiescent power consuming, transmission power consuming and peripheral equipment power consuming. How to reduce the power consuming in RS 485 designs is introduced, and also the method of hardware and software design is presented including choosing low power transceiver, optimizing communication data structure, optimizing communication working mode.展开更多
In order to accurate measure micro displacement, the paper presents an accurate measuring system of distributed micro displacement. The system uses a linear CCD and FPGA and network communication technology to realize...In order to accurate measure micro displacement, the paper presents an accurate measuring system of distributed micro displacement. The system uses a linear CCD and FPGA and network communication technology to realize data acquisition and remote transmission. The test results show that the system can support 16 line array CCD test node to measure the micro deformation of the one- dimensional, the CCD data transmission rate is 3200 frames/s, node data transmission distance is greater than 200 m, and measurement accuracy is 500 micron.展开更多
This paper proposes a redundant network communication structure for the patient integrated circuit(IC)card payment system in a hospital information system(HIS),compares it with the network structure of normal hospital...This paper proposes a redundant network communication structure for the patient integrated circuit(IC)card payment system in a hospital information system(HIS),compares it with the network structure of normal hospital IC card system,and calculates the reliabilities of the related communications like the RS485communication and the Ethernet communication.The new structure can efectively promote the reliability of the hospital operation and ensure the payment collection when the Ethernet network is broken.The system is applied to a local hospital and the cost-performance rate is satisfactory during the application.展开更多
文摘Three aspects of RS 485 application, which affect the reliability of communication of data system are analyzed and discussed. In network configuration, it presents the optimal configuration for the bus of RS 485, the better rule for derivative line and the choice for termination. In hardware design, it presents three parts of driver’s peripheral circuit. In control software design, it presents a method of using 75176’s DE line to control the driver.
文摘Power loss sometimes needs particular consideration in coal mine. This paper analyzes the main three parts of power consuming of RS 485 system, that is quiescent power consuming, transmission power consuming and peripheral equipment power consuming. How to reduce the power consuming in RS 485 designs is introduced, and also the method of hardware and software design is presented including choosing low power transceiver, optimizing communication data structure, optimizing communication working mode.
文摘In order to accurate measure micro displacement, the paper presents an accurate measuring system of distributed micro displacement. The system uses a linear CCD and FPGA and network communication technology to realize data acquisition and remote transmission. The test results show that the system can support 16 line array CCD test node to measure the micro deformation of the one- dimensional, the CCD data transmission rate is 3200 frames/s, node data transmission distance is greater than 200 m, and measurement accuracy is 500 micron.
基金the National Natural Science Foundation of China(No.81170507)the Project of Shanghai Committee of Science and Technology(Nos.11140903700 and 12142201200)
文摘This paper proposes a redundant network communication structure for the patient integrated circuit(IC)card payment system in a hospital information system(HIS),compares it with the network structure of normal hospital IC card system,and calculates the reliabilities of the related communications like the RS485communication and the Ethernet communication.The new structure can efectively promote the reliability of the hospital operation and ensure the payment collection when the Ethernet network is broken.The system is applied to a local hospital and the cost-performance rate is satisfactory during the application.
