CN2874646Y - Digital bus interface device for warning system - Google Patents
Digital bus interface device for warning system Download PDFInfo
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- CN2874646Y CN2874646Y CN 200520126102 CN200520126102U CN2874646Y CN 2874646 Y CN2874646 Y CN 2874646Y CN 200520126102 CN200520126102 CN 200520126102 CN 200520126102 U CN200520126102 U CN 200520126102U CN 2874646 Y CN2874646 Y CN 2874646Y
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- interface device
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- warning system
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Abstract
The utility model relates to a digitized bus interface device of warning system and belongs to the field of warning technical field. The device is arranged between the fire alarm controller and detector and is composed of a SCM circuit, a pulse modulator, a current detecting circuit and a filtering circuit. In addition, the pulse modulator is connected with the output terminal of SCM circuit. The current detecting circuit is connected with the input terminal of SCM circuit. The filtering circuit is arranged at the output terminal of the interface device. SCM controls the pulse modulator to modulate the data signal onto the power source and transmit to the detector. The current detecting circuit converts the current pulse returned by the detector into TTL signal, thus tackling quick response of the detector connected with two buses to fire. Output terminal of the interface device has filtering circuit to greatly boost signal quality at the bus end and effectively eliminate deformation of bus signals at the long wire end.
Description
Technical field
The utility model belongs to the alarm technique field, relates to a kind of digital bus interface device that is used for warning system.
Technical background
Present fire alarm system generally is made up of fire alarm control unit and detector, and all detectors all are connected on the output double bus of this fire alarm control unit.Fire alarm control unit regularly sends coded signal to detector, and microprocessor is contained in detector inside, after detecting the coded address that is complementary with oneself address, the state of oneself is sent to fire alarm control unit by bus.Because long line and the on-the-spot influence of disturbing, the data of transmission often distort, and are difficult to normal detection.Double bus power supply and signal can not send simultaneously, and this routine inspection mode has a polling period, and therefore, the fire response speed of detector is subjected to the influence of polling period, can not be very fast.
The utility model content
The purpose of this utility model provides a kind of digital bus interface device that is used for warning system, and transmission when it can solve double bus power supply and signal, the distortion of the terminal bus signals of long line and the fire of detector respond fast.
The digital bus interface device that is used for warning system provided by the utility model adopts following technical scheme: this digital bus interface device is connected between fire alarm control unit and the detector, be characterized in forming by single chip circuit, pulse-modulator, current detection circuit and filtering circuit, the output of pulse-modulator and single chip circuit is joined, the input of current detection circuit order sheet machine circuit, filtering circuit is connected on the output terminal of interface arrangement.
Principle of work of the present utility model is as described below: the digital bus interface device that is used for warning system that is provided, be connected between fire alarm control unit and the detector, fire alarm control unit is connected to detectors all on the output double bus by this digital bus interface device to the outside and sends the fire alarm request signal.When the single chip circuit in the digital bus interface device receives the fire alarm request signal of fire alarm control unit transmission, single chip circuit is encoded to signal transmitted, send coded signal to pulse-modulator, pulse-modulator is modulated to coded signal to be sent on the power supply, make existing signal on the double bus of output, power supply is arranged again, solved and be connected on the quick response problem of the fire of detector on the double bus.When the detector on being connected in parallel on the output double bus is received the signal of these fire alarm inquiries, each detector can both respond according to the state of oneself, and the pulse current that returns of detector is converted to the TTL signal through current detection circuit and delivers to fire alarm control unit through single chip circuit.When fire alarm took place, detector returned the address of oneself at once when receiving the fire alarm request signal, and fire alarm control unit carries out status poll by this address after receiving this address, obtain the State of alarm of this address rapidly.When simultaneously plural detector return address being arranged, the current signal that returns is superimposed, and returning the big address of pulse width so will at first be detected.Fire alarm control unit will at first be patrolled and examined this address, after fire alarm is confirmed, and system's processing that will take urgent measure.Simultaneously, the single chip circuit in this bus interface devices is during fire alarm control unit sends signal, and the input signal of down interface device after sending signal ended, is opened input signal, has avoided the interference of output signal to return signal.Can filter radio-frequency component in the square waveform that sends at the filtering circuit of this interface arrangement output terminal, reduced the oscillatory occurences of radio-frequency component in transmission course, pass through Filtering Processing, the signal quality of terminal bus is improved greatly, solved the distortion problem of the terminal bus signals of long line effectively.
The digital bus interface device of warning system that is used for provided by the utility model is because the enforcement of above-mentioned measure, having solved power supply and signal send simultaneously in the double bus transmission the problem and the fire of solution detector effectively responds fast, can be connected with various outside detecting modules, under heavy load, long line, strong jamming situation, all can work reliably.
Description of drawings
Fig. 1 is a circuit frame principle figure of the present utility model;
Fig. 2 is the circuit theory diagrams of the utility model embodiment;
The software flow pattern of Fig. 3 the utility model embodiment.
Among the figure: D1, single-chip microcomputer, D2C, phase inverter, V1, V2, V3, transistor, N1, comparer, R1-R11, C1, filter capacitor, L1, common mode inductance, F1, resettable fuse.
Embodiment
Further specify enforcement of the present utility model below in conjunction with accompanying drawing.Figure 1 shows that circuit frame principle figure of the present utility model, is the digital bus interface device that is used for warning system in the empty frame.As can be seen from Figure 1: this digital bus interface device is connected between fire alarm control unit and the detector, this device is made up of single chip circuit, pulse-modulator, current detection circuit and filtering circuit, the output of pulse-modulator and single chip circuit is joined, the input of current detection circuit order sheet machine circuit, filtering circuit is connected on the output terminal of interface arrangement.Fig. 2 is the circuit theory diagrams of an embodiment of the utility model.Described in this embodiment single chip circuit adopts single-chip microcomputer D1, the pull-down circuit that push-pull circuit that pulse-modulator is made of not gate D2C, resistance R 1, R2, R3, R4, transistor V1, V2 and resistance R 5, R6, R7 transistor V3 constitute is formed, current detection circuit is made up of comparer N1 and resistance R 8, R9, R10, R11, and wherein the input of pulse-modulator is connected in the I/O mouth of single-chip microcomputer D1 on the P1.3; Another one P1.5 joins in the same I/O mouth of the output of current detection circuit and single-chip microcomputer D1.Filtering circuit at this interface arrangement output terminal adopts capacitor C 1.Output terminal at interface arrangement also adds common mode inductance L1.Also be provided with a short-circuit protection circuit of forming by resettable fuse F1 on this interface arrangement.
When single-chip microcomputer D1 receives the fire alarm request signal of fire alarm control unit transmission, send coded signal by single-chip microcomputer D1 by P1.3 in the one I/O mouth, this I/O mouth is the high speed I/O port, can send the high pulse of precision, also can measure pulse width accurately.This coded signal is sent into the pull-down circuit of being made up of transistor V3 and resistance R 5, R6, R7, be used for bus drop-down by force, coded signal is through phase inverter D2C simultaneously, send into the push-pull circuit of forming by resistance R 1, R2, R3, R4, transistor V1, V2, improved driving force on the one hand, simultaneously, provide on the high level signal to bus and to draw, by pulse-modulator coded signal to be sent is modulated on the power supply, make existing signal on the double bus of output, power supply is arranged again, and power supply is used to provide and be connected in the detector operation power supply of exporting on the double bus.Because the effect of push-pull circuit and pull-down circuit makes the pulse signal figure of output more precipitous in the pulse-modulator, make coded signal transmission ground faster, be connected on detector on the output bus before patrolling and examining at every turn, all carry out broadcast query fire alarm state one time.In broadcasting command, do not contain address information, each detector can both respond according to the state of oneself.When fire alarm takes place, detector is when receiving the fire alarm request signal of being sent by this interface arrangement, return the address of oneself at once, current detection circuit in the digital interface unit that the current pulse signal that returns provides by the utility model is delivered to P1.5 in the I/O mouth of single-chip microcomputer D1 in the device, the pulse current that returns of detector forms a pulse voltage on sample resistance R9, detect through sending single-chip microcomputer D1 after the processing and amplifying.The P1 mouth P1.5 can send the high pulse of precision and measure pulse width accurately among the single-chip microcomputer D1.Single-chip microcomputer D1 is resent to fire alarm control unit after converting this current pulse signal to the TTL signal, and fire alarm control unit carries out status poll by this address after receiving this address, obtain the State of alarm of this address rapidly.When simultaneously plural detector return address being arranged, the current signal that returns is superimposed, and returning the big address of pulse width so will at first be detected.Fire alarm control unit will at first be patrolled and examined this address, and after fire alarm is confirmed, this detector will not respond the order of fire broadcast query.Capacitor filtering C1 at described interface arrangement output terminal, can filter the radio-frequency component in the square waveform that sends, reduced the oscillatory occurences of radio-frequency component in transmission course, pass through Filtering Processing, the signal quality of terminal bus is improved greatly, solved the distortion of the terminal bus signals of long line effectively, made total line length can reach 1500 meters.The common mode inductance L1 of interface arrangement output terminal is in order to suppress the common mode interference on the bus, to but not decay of differential signal.Resettable fuse F1 when short circuit takes place, can protect automatically, when short circuit disappears, can recover automatically, has improved system reliability greatly.The utility model has solved power supply and signal send simultaneously in the double bus transmission problem effectively and the fire of solution detector responds fast, can be connected with various outside detecting modules, all can work reliably under heavy load, long line, strong jamming situation.In the present embodiment: single-chip microcomputer D1 adopts 89V51, and not gate D2C adopts 74HC14, and comparer N1A adopts LM358, and transistor V1, V3 adopt C1008, and transistor V2 adopts TIP42.
Claims (5)
1, a kind of digital bus interface device that is used for warning system, be connected between fire alarm control unit and the detector, it is characterized in that forming by single chip circuit, pulse-modulator, current detection circuit and filtering circuit, the output of pulse-modulator and single chip circuit is joined, the input of current detection circuit and single chip circuit is joined, and at the output terminal of interface arrangement filtering circuit is arranged.
2, the digital bus interface device that is used for warning system according to claim 1, it is characterized in that described single chip circuit adopts single-chip microcomputer (D1), pulse-modulator is made up of the push-pull circuit of not gate (D2C), resistance (R1, R2, R3, R4), transistor (V1, V2) formation and the pull-down circuit that resistance (R5, R6, R7) transistor (V3) constitutes, current detection circuit is made up of comparer (N1) and resistance (R8, R9, R10, R11), and wherein the input of pulse-modulator is connected in the I/O mouth of single-chip microcomputer (D1) on one (P1.3); Another one (P1.5) joins in the same I/O mouth of the output of current detection circuit and single-chip microcomputer (D1).
3, the digital bus interface device that is used for warning system according to claim 1 and 2, the filtering circuit that it is characterized in that described interface arrangement output terminal are electric capacity (C1).
4, the digital bus interface device that is used for warning system according to claim 1 and 2 is characterized in that also being provided with on this interface arrangement a short-circuit protection circuit of being made up of resettable fuse (F1).
5, the digital bus interface device that is used for warning system according to claim 1 and 2 is characterized in that the output terminal of described interface arrangement adds common mode inductance (L1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520126102 CN2874646Y (en) | 2005-12-16 | 2005-12-16 | Digital bus interface device for warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520126102 CN2874646Y (en) | 2005-12-16 | 2005-12-16 | Digital bus interface device for warning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2874646Y true CN2874646Y (en) | 2007-02-28 |
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ID=37781242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520126102 Expired - Fee Related CN2874646Y (en) | 2005-12-16 | 2005-12-16 | Digital bus interface device for warning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2874646Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355395A (en) * | 2011-10-09 | 2012-02-15 | 蚌埠依爱消防电子有限责任公司 | Bus communication protocol of fire alarm system |
| CN106990730A (en) * | 2017-03-31 | 2017-07-28 | 四川赛科安全技术有限公司 | A kind of device and its implementation for realizing the remote large driven current density of fire-fighting bus |
-
2005
- 2005-12-16 CN CN 200520126102 patent/CN2874646Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355395A (en) * | 2011-10-09 | 2012-02-15 | 蚌埠依爱消防电子有限责任公司 | Bus communication protocol of fire alarm system |
| CN106990730A (en) * | 2017-03-31 | 2017-07-28 | 四川赛科安全技术有限公司 | A kind of device and its implementation for realizing the remote large driven current density of fire-fighting bus |
| CN106990730B (en) * | 2017-03-31 | 2019-11-01 | 四川赛科安全技术有限公司 | A kind of implementation method of device that realizing the remote large driven current density of fire-fighting bus |
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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: 20070228 Termination date: 20121216 |