Multi-level switching circuit for realizing communication flow control

Abstract

The invention provides a multi-level switching circuit for realizing communication flow control, which is simple in circuit, low in cost and compatible with TTL (Transistor-Transistor Logic), 485 and 422 level switching. The multi-level switching circuit comprises a CPU which is provided with a UART interface and is used for outputting TTL level; a switching module which is connected with the CPU and used for controlling a level signal sent by the CPU so as to switch a level working state; a level conversion module which is connected with the switching module and is used for converting the TTL level into an RS485 level working mode or an RS422 level working mode according to the signal sent by the switching module; and an output module which is connected with peripheral equipment and the level conversion module, and is used for receiving the converted level signal output by the level conversion module and transmitting the converted level signal to the peripheral equipment. The level conversion module comprises an RS422 level conversion module used for carrying out mutual conversion between a TTL level and an RS422 level, wherein the RS422 level conversion module is connected between the switching module and the output module; and an RS485 level conversion module which is used for carrying out mutual conversion between the TTL level and the RS485 level, wherein the RS485 level conversion module is connected between the switching module and the output module.

Description

technical field [0001] The invention relates to the technical field of level conversion, in particular to a multi-level switching circuit for realizing communication flow control. Background technique [0002] With the rapid development of digital signal processing technology, electronic products are also accelerating digitalization. When digital circuits communicate with analog circuits, it is necessary to first solve the conversion problem of different levels. At present, it is mainly realized by using conversion chips and peripheral components, but its Not only the circuit is complicated, the cost is high, but also it is not compatible with TTL, 485 and 422 levels that are widely used at present, which brings difficulties to practical applications; especially in the domestic market, the current domestic chips cannot achieve a chip through changing Peripheral components are configured to switch between 485 and 422 levels, which causes a lot of inconvenience. Contents of ...

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Problems solved by technology

[0002] With the rapid development of digital signal processing technology, electronic products are also accelerating digitalization. When digital circuits communicate with analog circuits, it is necessary to first solve the conversion problem of different levels. At present, it is mainly realized by using conversion chips and peripheral components, but its Not only the circuit is complicated, the cost is high, but it is also not compatible with the widely used TTL, 485 and 422 levels, which brings difficulties to practical applications; especially in the domestic market, the current domestic chips cannot achieve a chip through the change External components are configured to switch between 485 and 422 levels, which causes a lot of inconvenience

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