CN211207151U

CN211207151U - Double 485 conversion device capable of modifying communication parameters

Info

Publication number: CN211207151U
Application number: CN202020163556.3U
Authority: CN
Inventors: 王福广; 贺春玉; 辛丽娜; 姜文玉
Original assignee: Yantai Shen Hang Internet Of Things Technology Co ltd
Current assignee: Yantai Shen Hang Internet Of Things Technology Co ltd
Priority date: 2020-02-12
Filing date: 2020-02-12
Publication date: 2020-08-07
Anticipated expiration: 2030-02-12

Abstract

The utility model discloses a can revise two 485 conversion equipment of communication parameter, including conversion module, fixed parameter equipment module and RS485 bus module, be electric connection between conversion module's the output terminal and the input terminal of fixed parameter equipment module, and be electric connection between conversion module's the input terminal and the output terminal of RS485 bus module. The double 485 conversion device capable of modifying the communication parameters can be arranged between a bus and equipment, two 485 paths are adopted, one 485 path is connected with the bus, and the set communication parameters completely meet the requirements of the bus; in addition, one 485 is connected with a 485 interface of the equipment, parameters are set according to communication parameters of the equipment, so that 2 or more than 2 pieces of equipment can be mounted on one 485 bus, 2 independent 485 interfaces are set by adopting a single chip according to the 485 interface specification, an independent MODBUS protocol is realized on each 485 interface, and a communication protocol of RS4485-1 is arranged at one end of the 485 bus.

Description

Double 485 conversion device capable of modifying communication parameters

Technical Field

The utility model relates to a communication mode technical field specifically is a can revise two 485 conversion equipment of communication parameter.

Background

RS485 bus communication mode is a common, general communication mode in industrial automation, can carry the equipment of different grade type in the bus, and these equipment support the same RS485 design standard, and RS485 is only the hardware interface standard, and on communication protocol, more general is MODBUS communication protocol, and most equipment all supports RS485 interface, MODBUS protocol. The communication parameter setting mainly comprises a communication baud rate, a data bit, a stop bit, a check bit and a communication equipment address in a communication protocol. However, some devices do not support communication parameter modification for some reasons, and the communication parameters are fixed and the same parameters after leaving the factory, for example, the communication parameters are 9600,8N1 after leaving the factory of each device, and the protocol communication address is fixed to be 1, so that two or more devices which are the same cannot be mounted on one bus, and the only solution is to pull two buses and physically separate the two buses.

The conversion device on the market has serious material waste and high construction cost, but a common device is difficult to be arranged between a bus and equipment, two 485 circuits are not adopted, one 485 circuit is connected with the bus, and the problem that the set communication parameters cannot completely meet the requirements of the bus is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can revise communication parameter's two 485 conversion equipment to solve the problem of proposing among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a can revise two 485 conversion equipment of communication parameter, includes conversion module, fixed parameter equipment module and RS485 bus module, be electric connection between the output terminal of conversion module and the input terminal of fixed parameter equipment module, and be electric connection between the input terminal of conversion module and the output terminal of RS485 bus module.

Preferably, the conversion module comprises an RS485-1 unit and an RS485-2 unit, and the RS485-1 unit and the RS485-2 unit are respectively located at the input terminal and the output terminal of the conversion module.

Preferably, the conversion module, the fixed parameter equipment module and the RS485 bus module are respectively provided with two groups, and every two groups of the conversion module, the fixed parameter equipment module and the RS485 bus module are connected in parallel.

Preferably, the input and output terminals of the RS485-1 unit are connected in parallel with the RS485 bus module respectively.

Preferably, the RS485-2 unit and the fixed parameter equipment module are connected in series.

Compared with the prior art, the beneficial effects of the utility model are that: the device can be arranged between a bus and equipment, two paths of 485 are adopted, one path of 485 is connected with the bus, and the set communication parameters completely meet the bus requirements; in addition, one 485 is connected with the 485 interface of the equipment, parameters are set according to the communication parameters of the equipment, so that 2 or more than 2 pieces of equipment (equipment which cannot modify the communication parameters) can be mounted on one 485 bus, 2 independent 485 interfaces are set according to the 485 interface specification by adopting a single chip microcomputer, an independent MODBUS protocol is realized on each 485 bus, a communication protocol (RS 4485-1) at one end of the bus is connected, the communication parameters can be set through software, the setting of protocol communication addresses can realize the selection of (0-255) numerical values by using a dial switch, so that the communication of a plurality of communication addresses on one bus is realized, and the conflict caused by the same communication addresses can be avoided; the device realizes two independent 485 channel protocols, receives a message on RS485-1, analyzes the message in a standard way, modifies a communication address in the message after judging the message to be a qualified message, modifies the communication address to be the communication address of the device, packages the message into a qualified message, forwards the qualified message to the device through RS485-2, responds to the inquiry message after receiving the inquiry message, receives the device response through RS485-2, analyzes the message in a standard way, modifies the communication address in the message after judging the qualified message, and feeds back the modified message to a bus through RS485-1 after forming the qualified message.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

fig. 2 is a schematic diagram of the system circuit structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a double 485 conversion device capable of modifying communication parameters comprises a conversion module, a fixed parameter equipment module and an RS485 bus module, wherein an output terminal of the conversion module is electrically connected with an input terminal of the fixed parameter equipment module, and an input terminal of the conversion module is electrically connected with an output terminal of the RS485 bus module;

the conversion module comprises an RS485-1 unit and an RS485-2 unit, and the RS485-1 unit and the RS485-2 unit are respectively positioned at the input terminal and the output terminal of the conversion module; the conversion module, the fixed parameter equipment module and the RS485 bus module are respectively provided with two groups, and every two groups are connected in parallel; the input and output terminals of the RS485-1 unit are respectively connected with the RS485 bus module in parallel; the RS485-2 unit is connected with the fixed parameter equipment module in series;

2 paths of independent 485 interfaces are set by adopting a singlechip according to 485 interface specifications, an independent MODBUS protocol is realized on each path of 485, communication parameters can be set through software in a communication protocol connected with one end (RS 4485-1) of a bus, and the setting of protocol communication addresses can realize the selection of (0-255) numerical values by utilizing a dial switch, so that the communication of a plurality of communication addresses on one bus is realized, and the conflict caused by the same communication addresses can not occur; the device realizes two independent 485 channel protocols, receives a message on RS485-1, analyzes the message in a standard way, modifies a communication address in the message after judging the message to be a qualified message, modifies the communication address to be the communication address of the device, packages the message into a qualified message, forwards the qualified message to the device through RS485-2, responds to the inquiry message after receiving the inquiry message, receives the device response through RS485-2, analyzes the message in a standard way, modifies the communication address in the message after judging the qualified message, and feeds back the modified message to a bus through RS485-1 after forming the qualified message.

The working principle is as follows: for the double 485 conversion device capable of modifying the communication parameters, firstly, the device can be arranged between a bus and equipment, two 485 paths are adopted, one 485 path is connected with the bus, and the set communication parameters completely meet the requirements of the bus; in addition, one 485 is connected with the 485 interface of the equipment, parameters are set according to the communication parameters of the equipment, so that 2 or more than 2 pieces of equipment (equipment which cannot modify the communication parameters) can be mounted on one 485 bus, 2 independent 485 interfaces are set according to the 485 interface specification by adopting a single chip microcomputer, an independent MODBUS protocol is realized on each 485 bus, a communication protocol (RS 4485-1) at one end of the bus is connected, the communication parameters can be set through software, the setting of protocol communication addresses can realize the selection of (0-255) numerical values by using a dial switch, so that the communication of a plurality of communication addresses on one bus is realized, and the conflict caused by the same communication addresses can be avoided; the device realizes two independent 485 channel protocols, receives a message on RS485-1, analyzes the message in a standard way, modifies a communication address in the message after judging the message to be a qualified message, modifies the communication address to be the communication address of the device, packages the message into a qualified message, forwards the qualified message to the device through RS485-2, responds to the inquiry message after receiving the inquiry message, receives the device response through RS485-2, analyzes the message in a standard way, modifies the communication address in the message after judging the qualified message, and feeds back the modified message to a bus through RS485-1 after forming the qualified message.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a can revise two 485 conversion equipment of communication parameter, includes conversion module, fixed parameter equipment module and RS485 bus module, its characterized in that: the output terminal of the conversion module is electrically connected with the input terminal of the fixed parameter equipment module, and the input terminal of the conversion module is electrically connected with the output terminal of the RS485 bus module.

2. The dual 485 conversion device capable of modifying communication parameters according to claim 1, wherein: the conversion module comprises an RS485-1 unit and an RS485-2 unit, and the RS485-1 unit and the RS485-2 unit are respectively positioned at the input terminal and the output terminal of the conversion module.

3. The dual 485 conversion device capable of modifying communication parameters according to claim 1, wherein: the conversion module, the fixed parameter equipment module and the RS485 bus module are respectively provided with two groups, and every two groups of the conversion module, the fixed parameter equipment module and the RS485 bus module are connected in parallel.

4. The dual 485 converter device of claim 2, wherein: and the input and output terminals of the RS485-1 unit are respectively connected with the RS485 bus module in parallel.

5. The dual 485 converter device of claim 2, wherein: and the RS485-2 unit and the fixed parameter equipment module are connected in series.