| There is no unified national or industrial protocol for data communication between master station and concentrator when constructing Automatic Meter Reading(AMR) system for Low-voltage customers, and often lead to system integration, equipment replacement difficulty and the cost increases, which brings inconvenience to meter reading management of power supply company. So it is necessary to study and design an unified concentrator upstream communication protocol.The paper studies the concentrator upstream communication protocol of Hubei and Hunan Provinces, and participate in the compiling of protocol analysis, and design a concentrator upstream communication protocol which merges the advantages of communication protocol in Hubei and Hunan. The new designed concentrator upstream communication protocol which increases the protocol module of remote upgrade, enhances data reliability and reduces the ambiguity of the protocol. ARM7 32-bit LPC2214 embedded chip ARM7 is adopted by hardware platform as the master chip, three kinds of memory and upstream communication mode are extended in the peripheral chip. Software platform adopts portable real-time operating systemμC/OS-II to realize the multitask function of real-time operating system. The system improves real-time performance, reliability and stability of the system. In the development environment of ADS1.2, combined with object-oriented and process-oriented approach. The System realized the mixed programming of ASM, C and C++, which can switch various concentrator upstream communication protocol, and the system can have high robustness and scalability.At present, the protocol has applied to Jingmen in Hubei province. Results show that the protocol runs reliably and maintenance work of field reduced, and meter reading accurate reached 99%.Therefore, it can reach the expected goals and requirements of protocol, and play a positive role in the power user management and power supply quality.
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