Multipath asynchronous serial communication automatic switching method and device

Abstract

The invention relates to the field of electronic technology application, in particular to a multipath asynchronous serial communication automatic switching method, which comprises the following stepsof converting a plurality of RS-232 communication levels into corresponding TTL communication levels; transmitting the converted TTL communication level to a signal selector, wherein the signal selector is controlled by a single-chip microcomputer controller control instruction to control the level change of a pin of the signal selector so as to selectively output a required TTL signal; convertingthe obtained TTL signal into an RS-232 signal; and transmitting the converted RS-232 signal to the main equipment in a communication manner. The invention further provides a multi-channel asynchronous serial communication automatic switching device. The multipath asynchronous serial communication automatic switching device comprises an RS-232-to-TTL converter, a signal selector and a TTL-to-RS-232 converter. According to the invention, a one-to-many communication mode of the RS-232 interface is realized, the expansion of peripheral resources of the CPU is effectively avoided, the cost is reduced, and the method and device has the advantages of stable communication signals and low transmission power consumption.

Description

technical field [0001] The invention relates to the application field of electronic technology, in particular to a multi-channel asynchronous serial communication automatic switching method and a device thereof. Background technique [0002] At present, asynchronous serial communication RS-232 is the most widely used serial communication interface in embedded systems. It has the advantages of low cost and easy use, and is suitable for short-distance communication. [0003] Due to the problem that the traditional RS-232 interface can only communicate one-to-one, it cannot automatically switch between the slave device and the master device according to user needs, which makes it unsuitable in some scenarios. In the prior art, some designers use to expand the CPU peripherals and increase the multi-channel RS-232 communication interface to make up for the above defects, which increases the production cost virtually; The RS-232 serial port is changed to RS-485 or RS-422 serial p...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-channel asynchronous serial communication automatic switching method and its device capable of automatic communication switching, so as to solve the problem that the asynchronous serial communication RS-232 proposed in the above-mentioned background technology cannot realize one-to-multiple communication , and the problem that it is impossible to realize the automatic switching of communication

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