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This paper represents the methodology for monitoring continuously of power quality (PQ) by using real-time operating system (RTOS). The monitoring system acquired analog signals and send data via Ethernet network based on RTOS programs. After obtained signals, the monitoring system then send PQ information to the personal computer. The applied protocol is the user datagram protocol (UDP) to send PQ information via Ethernet. The architecture and software implementation are mentioned in the paper. An application test was created to test the throughput of the communication between the measurement point and the target computer.