System and method for measuring length of twisted pair based on RS485 bus signal transmission delay
A technology of RS-485 and transmission delay, which is applied in the system field of measuring twisted pair length based on RS485 bus signal transmission delay. The effect of strong ability and flexible method
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[0035] The system for measuring the length of the twisted pair based on the signal transmission delay of the RS485 bus in this embodiment includes a sending end and a receiving end, and the sending end and the receiving end are connected through a twisted pair.
[0036] The sending system such as figure 1 As shown, the main processor at the sending end is composed of two sub-modules: one is the waveform sending module, which is responsible for sending the measurement waveform; the other is the timer module, which is responsible for calculating the round-trip time of the waveform, and the 485 receives data to trigger and stop timing. The 485 chip is responsible for processing level conversion and data transfer. The sending end includes the main processor of the sending end and the 485 chip, the main processor of the sending end is connected to the 485 chip for communication, and the 485 chip is connected to the twisted pair; the main processor of the sending end includes a wave...
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