CN203118156U - RS485 communication interface - Google Patents
RS485 communication interface Download PDFInfo
- Publication number
- CN203118156U CN203118156U CN 201320045520 CN201320045520U CN203118156U CN 203118156 U CN203118156 U CN 203118156U CN 201320045520 CN201320045520 CN 201320045520 CN 201320045520 U CN201320045520 U CN 201320045520U CN 203118156 U CN203118156 U CN 203118156U
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- China
- Prior art keywords
- circuit
- fire detection
- single chip
- gas sensor
- communication interface
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Abstract
The utility model relates to a fire detection communication circuit. The fire detection communication circuit comprises a gas sensor circuit and a single chip microcomputer control circuit; output signals of the gas sensor circuit are transmitted to the single chip microcomputer control circuit through an A/D data conversion circuit; output signals of the single chip microcomputer control circuit are transmitted to an RS485 communication interface circuit; when the concentration of a gas reaches a certain value, through the judgment of the single chip microcomputer control circuit, standard protocol signals are outputted through an RS485 communication interface, such that fire detection communication circuit can be connected with various system host computers; and therefore the fire detection communication circuit has the advantages of strong compatibility, low cost, strong practicability and the like.
Description
Technical field
The utility model relates to a kind of telecommunication circuit, particularly be a kind of fire detection telecommunication circuit.
Background technology
Traditional fire detector poor compatibility, generally the detector ability connected system main frame of the special-purpose manufacturer production of need influences the user like this to the selection of brand.
The utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of fire detection telecommunication circuit is provided.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of fire detection telecommunication circuit, comprise gas sensor circuit and single chip machine controlling circuit, the output signal of described gas sensor circuit is transported to single chip machine controlling circuit through the A/D data converting circuit, and the output signal of described single chip machine controlling circuit is sent to the RS485 communication interface circuit.
Preferably, described gas sensor circuit is made of the output terminal series connection potentiometer R1 of gas sensor QM.
Preferably, described single chip machine controlling circuit adopts 2051 single-chip microcomputer IC1.
Preferably, described RS485 communication interface circuit is connected to system host by SN75176 communication interface chip IC2.
By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: when gas reaches finite concentration, the utility model is after single chip machine controlling circuit is judged, by RS485 communication interface outputting standard protocol signal, can connect various system hosts, have advantages such as compatibility is strong, cost is low, practical.
Description of drawings
Fig. 1 is frame assumption diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1 and Figure 2, a kind of fire detection telecommunication circuit of the present utility model, comprise gas sensor circuit 1 and single chip machine controlling circuit 2, the output signal of described gas sensor circuit 1 is transported to single chip machine controlling circuit 2 through A/D data converting circuit 11, and the output signal of described single chip machine controlling circuit 2 is sent to RS485 communication interface circuit 21.
Described gas sensor circuit 1 is made of the output terminal series connection potentiometer R1 of gas sensor QM, if detect the inflammable gas smell, resistance decreasing between gas sensor QM then, the sliding end current potential of potentiometer R1 raises, gas sensor QM output terminal current potential raises, the 2nd pin input signal of A/D data conversion module IC3 also increases, the 5th of A/D data conversion module IC3,6, the 12nd of 7 pin and 2051 single-chip microcomputer IC1,18,19 form data transmission circuit, 2051 single-chip microcomputer IC1 constantly read the data-signal of A/D data conversion module IC3, when gas sensor QM detects gas and reaches finite concentration, after 2051 single-chip microcomputer IC1 internal processes are judged, 2051 single-chip microcomputer IC1 and SN75176 communication interface chip IC2 form logical data circuit, send the driving command signal by 2051 single-chip microcomputer IC1 to SN75176 communication interface chip IC2, after SN75176 communication interface chip IC2 inner decoding, be converted to communication interface by the RS485 system bus, the outputting standard protocol signal, can connect various system hosts, have compatible strong, cost is low, advantage such as practical.
Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.
Claims (4)
1. fire detection telecommunication circuit, it is characterized in that: comprise gas sensor circuit (1) and single chip machine controlling circuit (2), the output signal of described gas sensor circuit (1) is transported to single chip machine controlling circuit (2) through A/D data converting circuit (11), and the output signal of described single chip machine controlling circuit (2) is sent to RS485 communication interface circuit (21).
2. fire detection telecommunication circuit according to claim 1 is characterized in that: described gas sensor circuit (1) is made of the output terminal series connection potentiometer R1 of gas sensor QM.
3. fire detection telecommunication circuit according to claim 1 and 2 is characterized in that: described single chip machine controlling circuit (2) employing 2051 single-chip microcomputer IC1.
4. fire detection telecommunication circuit according to claim 1 and 2, it is characterized in that: described RS485 communication interface circuit (21) is connected to system host by SN75176 communication interface chip I C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320045520 CN203118156U (en) | 2013-01-22 | 2013-01-22 | RS485 communication interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320045520 CN203118156U (en) | 2013-01-22 | 2013-01-22 | RS485 communication interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203118156U true CN203118156U (en) | 2013-08-07 |
Family
ID=48898480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320045520 Expired - Fee Related CN203118156U (en) | 2013-01-22 | 2013-01-22 | RS485 communication interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203118156U (en) |
-
2013
- 2013-01-22 CN CN 201320045520 patent/CN203118156U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20140122 |