Abstract-Aiming at the mixed use of fieldbus in industry automatic controlling system, the paper proposes a method of multi-functional gateway based on singlechip in order to reach an inter-coordination and compatibility among different protocol standards of fieldbus. Using singlechip as the core of the system ,a proposal of inter-communication among the standard bus interfaces of CAN(Controller Area Network), Profibus(Process Fieldbus), Modbus, Serial and Bluetooth is provided. The method to resolve the incompatibility between heterogeneous fieldbus is discussed, and an integrated approach based on gateway for the interoperation between CAN and Profibus is proposed. The interface between intelligent communication chip SPC3 and singlechip is described in detail. The method can realize a unified multi-node measuring and controlling network among different fieldbus, featuring as high speed of communication, good transmission efficiency, fine working stability and low cost, which can be applied to industry controlling system of one station controlling multi-level and multi-station servomechanism.
Based on the UAV requirements of small airborne equipment, the paper discusses the necessity of using PCM-FM modulation method to design small airborne transmitter. It is also introduced the principle to complete transmitter design using direct PLL FM technology, given phase transmission model using of dual voltage-controlled ports of the VCO to achieve direct PLL FM and PLL circuit design. Simulation and experimental data are close to the theoretical analysis, and further flight application shows that airborne transmitter using the direct PLL FM not only small but also is able to meet the high-speed data transmission requirements.
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