Serial port communication system and communication method

Abstract

The invention discloses a serial port communication system and communication method. The serial port communication system comprises a master device and a plurality of slave devices, the master device and the slave devices are connected in series step by step through serial ports, the master device is configured to send an address setting instruction to a first-stage slave device connected with the master device, and the address setting instruction comprises a configuration address of the first-stage slave device; the first-level slave device is configured to perform address configuration according to the address setting instruction, update a configuration address in the address setting instruction according to a preset address change value, and send the updated configuration address to the next-level slave device; the master device is configured to compare the received address information of the last-stage slave device with the stored number of slave devices to confirm whether a fault exists, and the master device achieves a one-master multi-slave communication mode through a single serial port.

Description

technical field [0001] The invention relates to the field of industrial data communication, in particular to a serial port communication system and a communication method. Background technique [0002] Serial port communication is a widely used single-bus data communication, which is widely used in computer serial interface and data communication between devices. Serial port communication is easy to use and fast. It is a full-duplex communication method, and data transmission and reception can be initiated between two devices at the same time. At present, the serial port communication usually adopts the RS232 standard, and the serial port communication only allows one-to-one connection, but does not allow one-to-many and many-to-many networking, so the communication address is not involved in the use of serial port communication. However, in many applications, there is one master device and multiple slave devices, and each device only has a serial communication interface. ...

AI Technical Summary

Problems solved by technology

However, although this prior art can realize the automatic allocation of slave device addresses and data communication, it requires that the buses of all device interfaces be connected together, and all slave devices can simultaneously receive the data sent by the master device, and the communication interfaces all include a Group bus and a group of strobe signals, so it cannot be applied to some current communication equipment occasions with only a few serial communication interfaces, and cannot solve the problem of using a master device to communicate with multiple slave devices through a single serial communication interface.

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