CN205539295U - 485 bus communication fault detection module - Google Patents

Abstract

The utility model relates to a communication technology field provides a 485 bus communication fault detection module, including first singlechip chip, second single -chip microcomputer chip, a 485 bus communication unit, the 2nd 485 bus communication unit, first resistance R01, second resistance R02 and fault indication unit, the 2nd 485 bus communication unit is connected with 485 bus communication link component parallelly connectedly respectively with the first resistance R01 other end and the second resistance R02 other end, a first singlechip chip and a 485 bus communication unit communication connection, second single -chip microcomputer chip and the 2nd 485 bus communication unit communication connection, first singlechip chip docks with the 2nd analog communication serial ports of second single -chip microcomputer chip, the fault indication unit is controlled to the connection of first singlechip chip. The utility model provides a short circuit of current 485 bus communication link be difficult to with the type that opens circuit to distinguish, the problem of communication data distortion.

Description

A kind of 485 Bus communication fault detection module

Technical field

This utility model relates to communication technique field, particularly to a kind of 485 bus communication fault detection module.

Background technology

Electrical fire monitoring device is the terminal control part that electric leakage signal processes, the signal passed over scene by upper software carries out intellectual analysis process, judge the state (i.e. malfunction, fire alarm state, normal operating conditions) of each current probe, scent a hidden danger position in time, reduces the generation of electrical fire；And the bridge that 485 bus communication link are often worked hard in glove with as electrical fire monitoring device and detector, the quality of its duty decides fire hazard monitoring signal, the accuracy of instruction transmission, reliability.The short circuit of existing 485 bus communication link and open circuit type are difficult to correctly distinguish, and are simply classified as a class simply, it is impossible to thoroughly distinguish, thus cause communication data distortion, the generation of misinformation accident and cannot understand the current intelligence of communication line in time.

Summary of the invention

Therefore, for above-mentioned problem, the utility model proposes a kind of can effectively identification and judge 485 bus communication link short circuit and 485 bus communication fault detection module of open circuit fault type.

nullFor solving this technical problem，This utility model takes below scheme: a kind of 485 communication failure detection modules，Including the first singlechip chip、Second singlechip chip、One 485 bus communication unit、2nd 485 bus communication unit，First resistance R01、Second resistance R02 and indicating fault unit，Described first resistance R01 and the second resistance R02 connects with two ports of 485 bus communication link respectively，Described one 485 bus communication unit is connected with first resistance R01 one end and second resistance R02 one end respectively and constitutes in parallel with 485 bus communication link，Described 2nd 485 bus communication unit is connected with the first resistance R01 other end and the second resistance R02 other end respectively and constitutes in parallel with 485 bus communication link，Described first singlechip chip and the one 485 bus communication unit communication connect，Described second singlechip chip and the 2nd 485 bus communication unit communication connect，Described first singlechip chip docks with the second analogue communication serial ports of second singlechip chip，Described first singlechip chip connects and controls indicating fault unit.

Further improve, also include that acousto-optic warning unit, described acousto-optic warning unit connect and be controlled by the first singlechip chip.

By using preceding solution, the beneficial effects of the utility model are: by Appropriate application the first singlechip chip, second singlechip chip, first resistance R01 and the second resistance R02 is connected to form detection circuit each via the one 485 bus communication unit and the 2nd 485 bus communication unit with 485 bus communication link, first singlechip chip and the isolation of 485 bus communication link, second singlechip chip and 485 bus communication link are without isolation, by two groups of communication serial port intercommunication of two chips, combine through logical operations and judge, so that the first singlechip chip can accurately judge short circuit or the open circuit fault of 485 bus communication link, correct differentiation short circuit and open circuit type, reduce communication data distortion, the generation of misinformation accident, understand the current intelligence of 485 bus communication link in time.

Accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of this utility model embodiment.

Detailed description of the invention

In conjunction with the drawings and specific embodiments, this utility model is further illustrated.

nullWith reference to Fig. 1，485 communication failure detection modules the most of the present utility model，Including the first singlechip chip 1、Second singlechip chip 2、One 485 bus communication unit 3、2nd 485 bus communication unit 4，First resistance R01、Second resistance R02、Indicating fault unit 5 and acousto-optic warning unit 6，Described first resistance R01 and the second resistance R02 respectively with the A of 485 bus communication link、Two port series connection of B，Described one 485 bus communication unit 3 is connected with first resistance R01 one end and second resistance R02 one end respectively and constitutes in parallel with 485 bus communication link，Described 2nd 485 bus communication unit 4 is connected with the first resistance R01 other end and the second resistance R02 other end respectively and constitutes in parallel with 485 bus communication link，Described first singlechip chip 1 communicates to connect with the one 485 bus communication unit 3，Described second singlechip chip 2 communicates to connect with the 2nd 485 bus communication unit 4，Described first singlechip chip 1 docks with the second analogue communication serial ports of second singlechip chip 2，Described first singlechip chip 1 connects and controls indicating fault unit 5，Described acousto-optic warning unit 6 connects and is controlled by the first singlechip chip 1.

Operation principle: 485 bus communication fault detection module are used in system host and the intermediary of the extension set that communicates, also serve as a member in extension set simultaneously, when system host sends instruction, first singlechip chip 1 receives correct instruction at any time, depending on second singlechip chip 2 then situation according to 485 bus communication link, when 485 bus communication link are normal, if second singlechip chip 2 can receive correct instruction, pass through 1P1.2, 1P1.3 feeds back to the first singlechip chip 1 and compares, if identical, if communication extension set has back code, then it is considered as communication normal, otherwise confirm as the open circuit that communicates, first singlechip chip 1 driving malfunction indicating member 5 shows open circuit fault type, control acousto-optic warning unit 6 simultaneously and carry out sound and light alarm；If second singlechip chip 2 cannot receive correct instruction, in stipulated time, second singlechip chip 2 feeds back to the first singlechip chip 1 by 1P1.2,1P1.3 and compares, then confirm as communication short circuit, first singlechip chip 1 driving malfunction indicating member 5 shows short trouble type, controls acousto-optic warning unit 6 simultaneously and carries out sound and light alarm.

This utility model passes through Appropriate application the first singlechip chip, second singlechip chip, first resistance R01 and the second resistance R02 is connected to form detection circuit each via the one 485 bus communication unit and the 2nd 485 bus communication unit with 485 bus communication link, first singlechip chip and the isolation of 485 bus communication link, second singlechip chip and 485 bus communication link are without isolation, by two groups of communication serial port intercommunication of two chips, combine through logical operations and judge, so that the first singlechip chip can accurately judge short circuit or the open circuit fault of 485 bus communication link, correct differentiation short circuit and open circuit type, reduce communication data distortion, the generation of misinformation accident, understand the current intelligence of 485 bus communication link in time.

Although specifically showing in conjunction with preferred embodiment and describing this utility model; but those skilled in the art should be understood that; in the spirit and scope of the present utility model limited without departing from appended claims; this utility model can be made a variety of changes in the form and details, be protection domain of the present utility model.

Claims (2)

1. null1. a bus communication fault detection module，It is characterized in that: include the first singlechip chip、Second singlechip chip、One 485 bus communication unit、2nd 485 bus communication unit，First resistance R01、Second resistance R02 and indicating fault unit，Described first resistance R01 and the second resistance R02 connects with two ports of 485 bus communication link respectively，Described one 485 bus communication unit is connected with first resistance R01 one end and second resistance R02 one end respectively and constitutes in parallel with 485 bus communication link，Described 2nd 485 bus communication unit is connected with the first resistance R01 other end and the second resistance R02 other end respectively and constitutes in parallel with 485 bus communication link，Described first singlechip chip and the one 485 bus communication unit communication connect，Described second singlechip chip and the 2nd 485 bus communication unit communication connect，Described first singlechip chip docks with the second analogue communication serial ports of second singlechip chip，Described first singlechip chip connects and controls indicating fault unit.
2. 485 bus communication fault detection module the most according to claim 1, it is characterised in that: also include that acousto-optic warning unit, described acousto-optic warning unit connect and be controlled by the first singlechip chip.