Method, device and system capable of achieving serial port communication

Abstract

The invention discloses a method, a device and a system capable of achieving serial port communication and belongs to the communication technical field. The method comprises the following steps: each slave device in place is ascertained through a control bus and a serial bus; each interrupt request sent by each slave device in place is received through the control bus; when the interrupt request of only one slave device in place is received at present, the serial bus is assigned to the slave device, in place, which sends the interrupt request at present; when the interrupt requests of a plurality of slave devices in place are received at present, a corresponding interrupt priority level of each of slave devices in place is ascertained and the serial bus is assigned to one of the slave devices in place according to the interrupt priority levels of the plurality of slave devices in place; and data communication is conducted through the serial bus and the slave device, in place, which the serial bus is assigned to. According to the technical scheme, device identification (ID) is not brought in, so that a series of problems which are caused by setting of the device ID in the prior art can be solved, processing efficiency of a primary device is improved and shared serial bus conflicts can not be caused.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method, device and system for realizing serial port communication. Background technique [0002] At present, the master device mainly manages the slave devices connected to it through the serial bus, and identifies different slave devices according to the device ID of the slave device. The serial bus is shared by all slave devices connected to it, and the device of the slave device ID is determined by dial switch, welding resistance or software configuration. When the master device communicates with the slave device connected to it, the master device sends a data message containing the device ID of the slave device to the slave device connected to it; then, after the slave device receives the data message sent by the master device, if If the device ID in the received data message is different from its own device ID, the data message is discarded; otherwise, the data mess...

AI Technical Summary

Problems solved by technology

[0004] 1. When setting the device ID of the slave device through the dial switch, due to the poor reliability of the dial switch, it is easy to cause the device ID to be set incorrectly, so that there is a recognition error when identifying the slave device

[0005] 2. When the device ID of the slave device is set by selecting welding resistors, the same type of slave device needs to be managed and distinguished using different lists, which will result in higher production and processing costs and management costs

[0006] 3. When the device ID setting of the slave device is realized through software configuration, the software configuration is prone to errors, resulting in incorrect device ID settings, resulting in recognition errors when identifying the slave device

[0007] 4. When the device ID setting of the slave device is wrong, it is difficult to troubleshoot

[0008] 5. When the master device communicates with the slave device, the communication data needs to contain the device ID information, which will cause a large overhead of the communication protocol inside the device, resulting in low efficiency of data transmission

[0012] 1. Each slave device uses a set of serial buses to communicate with the master device, resulting in too complicated wiring between the master device and the slave device, which is not suitable for communication between long-distance devices

[0013] 2. Since the master device needs to design the serial bus interface according to the number of slave devices connected to it, the number of slave devices managed by the master device is limited to the serial bus interface of the master device

[0014] 3. The master device designs the number of serial buses according to the number of slave devices, and the shared bus cannot be used. In this way, the master device will expand more serial bus interfaces, and the hardware cost is higher

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