Baud rate deviation detection method and device and air conditioner indoor unit

Abstract

The invention discloses a baud rate deviation detection method and device and an air conditioner indoor unit. The method comprises the steps that before communication is established between a first communication device and a second communication device which are connected through a serial port line, the first communication device obtains a baud rate deviation value of the second communication device according to a detection pulse signal sent by the second communication device; the first communication device obtains own baud rate deviation value according to the same detection pulse signal sent by the first communication device; and the first communication device calculates to obtain a total baud rate deviation value according to the two baud rate deviation values, and when the total baud rate deviation value exceeds a baud rate deviation threshold value, it is judged that a deviation fault occurs in a baud rate. According to the method, the device and the air conditioner indoor unit, before the communication is established between the communication devices, the baud rate deviation is detected, the baud rate deviation is diagnosed timely, communication faults resulting from the baud rate deviation are effectively reduced, and the normal communication between the communication devices is ensured.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a method and device for detecting baud rate deviation, and an air conditioner indoor unit. Background technique [0002] The baud rate is the rate of a single-chip microcomputer or computer during serial communication. Specifically, it refers to the change in the unit time after the signal is modulated, that is, the number of times the carrier parameter changes in the unit time, such as transmitting 240 characters per second. And each character format contains 10 bits (1 start bit, 1 stop bit, 8 data bits), and the baud rate at this time is 240Bd. [0003] When serial communication is used between communication devices, the communication between them will be normal only if the baud rates of the two communication devices are consistent. When the baud rate deviates due to some reasons (such as the baud rate setting error of a certain device in the sending de...

AI Technical Summary

Problems solved by technology

When the baud rate deviates due to some reasons (such as the baud rate setting error of a certain device in the sending device or the receiving device), there will be a communication failure between the communication devices, resulting in the failure of the communication device to work normally

For example, when the outdoor unit of the air conditioner communicates with the indoor unit, if there is a deviation between the baud rate of the outdoor unit and the baud rate of the indoor unit, there will be a communication failure between the indoor unit and the outdoor unit, resulting in the failure of the indoor unit. normal work

Usually, there are many reasons for the failure of communication equipment to work normally. In this case, it is necessary to use professional test equipment such as an oscilloscope to check the cause of the failure of communication equipment. Since the test process of the test equipment is relatively complicated, the entire investigation process is time-consuming. Laborious and low efficiency

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