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automatic address allocation system and method for RS485 communication

An RS485, automatic distribution technology, applied in the field of electronic communication, can solve the problems affecting the efficiency and reliability of RS485 communication, consuming manual settings, and serious time-consuming, so as to ensure reliability and communication efficiency, facilitate on-site standardized construction, and avoid The effect of extra overhead

Inactive Publication Date: 2019-05-14
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The first three methods require manual settings and are not convenient for on-site operation. The fourth method is time-consuming and seriously affects the efficiency and reliability of RS485 communication. The fifth method adds a communication arbitration line, which makes the on-site wiring complicated and increases construction. cost

Method used

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  • automatic address allocation system and method for RS485 communication
  • automatic address allocation system and method for RS485 communication
  • automatic address allocation system and method for RS485 communication

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Embodiment Construction

[0022] The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0023] Such as figure 1 As shown, the present embodiment provides an automatic address assignment system for RS485 communication, including a host and multiple slaves, the host is directly connected to one of the multiple slaves, and the slave is connected to Other slaves are connected in series.

[0024] The communication interface of the main machine is provided with 2-way connection terminals A, B; the communication interface of the slave machine is provided with 4-way connection terminals, including 2 lines for input terminals A1, B1, and 2 lines for output terminals A2, B2; Terminal A is connected to the input terminal A1 of the first slave, and the termin...

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Abstract

The invention discloses an automatic address allocation system and method for RS485 communication. The system comprises a host and a plurality of slaves, wherein the host is directly connected with one of the plurality of slaves; The slave machines are connected with other slave machines in series, the master machine can send an instruction through an RS-485 bus to enable the slave machines to control relays of the slave machines to be switched off and switched on, addresses are written into the slave machines successively, and the relays to which the slave machines belong are kept in a switched-on state after the addresses are written into the slave machines. The communication addresses of the RS485 slaves can be accurately and rapidly distributed, communication connection between the master machine and the slave machines is conveniently achieved, extra expenses of software and hardware are avoided, errors caused by interference in the communication process are avoided, the communication reliability and the communication efficiency are guaranteed, and meanwhile field standardized construction is easier through the wiring terminal design of the slave machines.

Description

technical field [0001] The invention discloses an automatic address allocation system and method for RS485 communication, and relates to the technical field of electronic communication. Background technique [0002] RS485 communication is a widely used data communication method, often used between centralized control units and decentralized control units. The RS485 communication port adopts differential signal negative logic, +2V ~ +6V means "0", -6V ~ -2V means "1". RS485 has two types of wiring, two-wire system and four-wire system. The four-wire system is a full-duplex communication mode, and the two-wire system is a half-duplex communication mode. In the RS485 communication network, due to the convenience of wiring, the half-duplex master-slave communication method is generally used, that is, one master has multiple slaves, and the two communication lines of the master and slaves are connected in parallel. [0003] When RS485 adopts the half-duplex master-slave communi...

Claims

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Application Information

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IPC IPC(8): H04L29/12
Inventor 胡忠林吴夕科赵晓冬高晨
Owner STATE GRID CORP OF CHINA
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