Synchronization time-division multiplexing bus communication method adopting serial communication interface

Abstract

The invention discloses a synchronization time-division multiplexing bus communication method adopting a serial communication interface. Data receiving lines and data delivery lines of a host machine and slave machines are all connected with a bus respectively. The method is that each slave machine receives data through a serial communication interface (SCI) when the host machine sends downstream data message correspondingly needed by each slave machine once, the slave machine begin to send upstream data message after a certain time interval, a next slave machine begin to send upstream data message after same time interval when a last slave machine sends the upstream data message, and the bus communication method is achieved and the like. Only two physical connection lines are used to achieve high-reliability difference connection on the basis possessed by most majority of microprogrammed control units (MCU), simultaneously high-speed real-time requirements can be met, a bus communication problem of an internal module of the device is solved, real-time controllable communication is achieved, complexity of a hardware circuit is reduced, and generality and reliability are strengthened.

Description

technical field [0001] The invention relates to a bus communication method, in particular to a synchronous time-division multiplexing bus communication method using a serial communication interface. Background technique [0002] In industrial control, automatic devices always use a large number of input and output interfaces to collect signals from various sensors, switch signals, and control the output of relays. In form, it is mostly implemented by the main control board and input and output boards. Earlier, each channel of the input and output boards was directly connected to the MCU pins of the main control board, which required that the pins of the main control MCU must meet the quantity requirements. At the same time, the input and output required by different applications The number of the main control board is not the same, resulting in a decline in the versatility of the main control board. [0003] At present, automatic devices have generally used the bus as a co...

AI Technical Summary

Problems solved by technology

Although this kind of communication bus achieves the purpose of real-time communication, due to the complexity of hardware circuits and circuits, the realization of the bus has higher requirements on the hardware of MCU, and its implementation method is complicated, which greatly increases the cost of use, and the real-time performance of communication is difficult to control , the real-time performance of communication is affected by the hardware circuit, and at the same time affects the reliability of communication and the speed of the bus

Therefore, based on the above, no matter what kind of internal bus mode, either an additional high-speed logic chip is used to improve the speed and reliability of the bus, or multiple data lines or additional circuits are used to control the bus to ensure Speed ​​and reliability, or a trade-off between speed and reliability, all have high requirements on the hardware of the MCU, the hardware circuit is complex, and is greatly affected by hardware devices, making its communication reliability and bus speed affected. Limitations, it is difficult to achieve high reliability while meeting high-speed real-time requirements

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