Automatic allocation method for serial device communication addresses

Abstract

The invention relates to an automatic allocation method for serial device communication addresses, which comprises the following steps: after an instruction is received from a device, setting an address recognition output pin to be high or low, and judging whether the levels of the output pin and an input pin are consistent or not; and if the levels of the input pin and the output pin are inconsistent, setting the own equipment address to be 1, sending the equipment address to the gateway, and outputting two pulses to the next equipment at the output pin after delaying for a period of time; ifthe level of the output pin is consistent with the level of the input pin, enabling the slave equipment to configure the address recognition input pin to be in an edge or level triggering interrupt mode; accumulating the number of the pulses in the interruption, setting the number of the pulses as the address of the device itself after the number of the pulses is transmitted, sending the addressto the gateway, and then adding one pulse to the number of the addresses output by the address recognition output pin to the next device. Therefore, the method for automatically allocating the addresses of the gateway and the following slave devices in the serial port mode is realized, and the flexibility and convenience of allocating the addresses of the plurality of slave devices are improved.

Description

technical field [0001] The invention relates to a method for automatically assigning addresses, in particular to a method for automatically assigning communication addresses of serial devices. Background technique [0002] In the application of serial communication systems, there is usually a communication-related dominant device and a plurality of terminal devices subordinate to the dominant device, and in the general industrial control field, most of them use one-master-multiple-slave communication architecture. Under this architecture, the serial communication system is composed of a master device and several slave devices. In order to establish a good communication between the master device and the slave devices, the address of the slave device must be unique, otherwise the address of the slave device will be unique. If there is a conflict, the data transmission will fail. [0003] For the serial communication system under the one-master-multi-slave communication archi...

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Problems solved by technology

[0009] However, the above two allocation methods both use the host to send allocation instructions, and use the lock between each series-connected slave to realize the sequential reception of allocation instructions for each slave and realize address allocation, which involves the slave and the host. The problem of two-way signal transmission between, which will lead to prolonged address allocation response speed, and the process is more complicated

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