Method and system for locally realizing automatic address allocation of RS485 slave equipment

Abstract

The invention discloses a method and a system for locally realizing automatic address allocation of RS485 slave equipment. The method comprises the following steps that: host equipment selects one setof slave equipment to issue an address allocation instruction to the slave equipment; the slave equipment acquires the random number, waits for an interval, and returns the random number, the local number and the group number to which the slave equipment belongs; and the host equipment checks the random number and the local number, determines a group address and a local address after the random number and the local number are correct, and sends the group address and the local address to the slave equipment, and if the group address and the local address are correct, the next slave equipment of the to-be-processed group repeatedly executes the above steps until all slave equipment in the group are successfully allocated, and the next group is changed to repeatedly execute the above steps.The method is easy to operate and implement, the specific method process can be modified and cut according to the actual situation, localization can be truly achieved, background remote record checking is not needed, and on-site personnel debugging and background technician participation are reduced.

Description

technical field [0001] The invention belongs to the application field of electronic communication engineering, and in particular relates to a method and a system for locally realizing group address and local address automatic distribution of RS485 slave equipment. Background technique [0002] The RS485 communication bus has the characteristics of strong anti-common-mode interference ability, multi-party parallel communication in the field, and long distance transmission signal. It is widely used in the field of engineering wired communication. [0003] In the communication system, the host performs grouping and individual query functions for each slave device, requiring RS485 devices to have grouping and independent address attributes. Its usual practice is as follows: [0004] Hardware Configuration. There may be two situations: (a) carry out independent RS485 communication for each group, expand the RS485 communication port, and carry out one-to-one correspondence betwe...

AI Technical Summary

Problems solved by technology

There may be two situations: (a) carry out independent RS485 communication for each group, expand the RS485 communication port, and carry out one-to-one correspondence between the communication between the host and the slave device, and put forward the requirements for the cost of hardware chips and external wiring and the space required for the circuit board Special requirements; (b) Select the DIP switch; it is easy for on-site personnel to operate and implement, but the disadvantage is that it generally needs to dismantle the shell for configuration, and the DIP switch is also easily damaged by external force, causing unnecessary trouble

This method also has two deficiencies: (1) On-site record feedback is required, and each record needs to be set separately, which increases the on-site human intervention and raises the requirements for the site; (2) The parameters set according to the site needs are handed over to the background The operation and processing of the management personnel increases the communication link and requires greater support; each device also needs clear statistical record parameters

Images