Communication method for 485 interface bus by adopting time-sharing time window method
A technology of time window and interface bus, applied in the field of communication, can solve the problem of low efficiency of communication mode, and achieve the effect of improving communication reliability, avoiding bus signal conflict, and reducing the probability of bus signal conflict.
Pending Publication Date: 2021-07-02
河南锐利特计算机科技有限公司
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Problems solved by technology
[0004] What the present invention will solve are problems such as low efficiency of the communication mode, and provide a method for communicating with the 485 interface bus using the time-sharing time window method
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Embodiment Construction
[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0040] combined with Figure 1-6 , The 485 interface bus adopts the method of time-sharing time window communication, the master device sends data flow to the slave device, the slave device sends data flow to the master device, the master device MCU timer and bus monitoring, the slave device MCU timer and bus monitoring , Communication data definition composition;
[0041] The definition of the communication data: the communication data is divided into two categories, which are conventional communication data and creation time window function data;
[0042] The main device MCU timer and bus monitoring: start timing and 485 bus monitoring function after the main device sends data;
[0043] The slave device MCU timer and bus monitoring: start timing and 485 bus monitoring function after sending data from the device;
[0044] The process of sending data from ...
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The invention relates to a communication method for 485 interface bus by adopting time-sharing time window method. A main device sends data process to a slave device which sends data process to the main device. The invention is composed of an MCU timer and bus monitoring function of the main device, an MCU timer and bus monitoring function of the slave device and a communication definition. The communication data is defined as follows: the communication data is divided into two types, namely conventional communication data and time window creating function data; the MCU timer and bus monitoring function of the main device is that the main device starts timing after sending data and has a 485 bus monitoring function; the MCU timer and the bus monitoring function of the slave device are used for starting timing and 485 bus monitoring after the slave unit sends data; the process of sending data from the main device to the slave device is a process of sending data from the main device to the slave device and receiving data; the process of sending the data from the slave device to the main device is a process of sending and receiving the data from the slave device to the main device.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to a communication method for a 485 interface bus using a time-sharing time window method. Background technique [0002] With the development of industrial technology and the popularization of control technology, the RS-485 bus is widely used in the field of control, and communication between multiple devices has become common. [0003] RS-485 supports half-duplex and full-duplex modes, and network topology generally adopts a terminal-matched bus structure. According to the TIA / EIA-485-A standard, the polling-response communication is adopted between the 485 bus master station and the slave station. This master-slave polling-response communication method well avoids bus conflicts, especially in the case of long distances and a large number of stations. However, this traditional communication method is not suitable for specific applications. For example, the communication be...
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IPC IPC(8): G06F13/362G06F13/42
CPCG06F13/3625G06F13/4291
Inventor孟繁华刘戈王凯崔文四刘星尚晨飞
Owner河南锐利特计算机科技有限公司