Bidirectional bus communication circuit and communication method

Abstract

The invention provides a bidirectional bus communication circuit which comprises a host device, a plurality of slave devices and buses, wherein the host device is connected with the slave devices via the buses; the host device comprises a host data sending circuit, a host data receiving circuit and a host CPU; and each slave device comprises a slave data sending circuit, a slave data receiving circuit and a slave CPU. The invention further provides a bidirectional bus communication method which comprises the following steps: S1, the host device supplies power for or charges the slave devices; S2, data of the host device data is downlinked, while the slave devices receive the downlinked data; and S3, data of the slave devices is uplinked, while the host device receives the uplinked data. The bidirectional bus communication circuit provided by the invention can adopt various topology modes, and supports various modes such as an annular mode and a star-like mode, so that the engineering difficulty is greatly reduced in the aspects of topology modes, cable cost and wiring difficulty, the bidirectional bus communication circuit can support long-distance communication, up to 128 slave loads, and a low-power mode, and anti-jamming capability is enhanced.

Description

technical field [0001] The invention relates to the field of bus communication, in particular to a bidirectional bus communication circuit and a communication method. Background technique [0002] Compared with traditional point-to-point communication, bus communication has been greatly improved. It can not only effectively reduce the complexity of connection, but also improve the utilization rate of connection. Therefore, bus communication is now widely used in various professional communication fields. [0003] However, conventional bus communication uses a bus to connect each node in series, which does not support ring or star network, which brings trouble to project wiring, and in the project where the slave power supply needs to be powered by the master, a bus system needs four The workload and cost of cable and engineering wiring construction are too large. In addition, the communication distance of conventional bus communication is short, the anti-interference ability...

AI Technical Summary

Problems solved by technology

[0003] However, conventional bus communication uses a bus to connect each node in series, which does not support ring or star network, which brings trouble to project wiring, and in the project where the slave power supply needs to be powered by the master, a bus system needs four The cable and engineering wiring construction work is too heavy and the cost is too high. In addition, the communication distance of the conventional bus communication is short, the anti-interference ability is weak, the power consumption is large, and the load slaves that can be supported are few

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