CN1201272C - Alarm information transmission method and two-wire system communication bus equipment - Google Patents
Alarm information transmission method and two-wire system communication bus equipment Download PDFInfo
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- CN1201272C CN1201272C CN 02129002 CN02129002A CN1201272C CN 1201272 C CN1201272 C CN 1201272C CN 02129002 CN02129002 CN 02129002 CN 02129002 A CN02129002 A CN 02129002A CN 1201272 C CN1201272 C CN 1201272C
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Abstract
The present invention provides an alarm information transmission method which relates to fire hazard alarm fields. A main device is used for polling accidental devices circularly, and the accidental devices carry out polling answering. The present invention is characterized in that in answering information of the accidental devices, alarm information is set as precedence information, and in each polling period, before the accidental devices carry out an answering time sequence, a precedence information time groove is arranged so as to transmit the precedence information. A two-wire system communication bus device comprises the main device (1) and a plurality of accidental devices (2), wherein the main device(1) is connected with the accidental devices (2) through two-wire system serial communication buses (3), and the accidental devices (2) also comprise a conflict detection circuit and a conflict blocking circuit. Because of the adoption of the proposal, the precedence information of the accidental devices is responded fast, so that the alarm information can be transferred fast.
Description
Technical field
The present invention relates to the fire alarm field, relate in particular to the device that a kind of serial communication bus that adopts two-wire system carries out fire alarm.
Background technology
In the industry cycle, the automatic fire detection-alarm system is made up of alarm controller and the fire detector that is distributed in each check point usually, be connected by two bus modes between alarm controller and each fire detector, because the fire detector power supply must be provided by alarm controller, therefore its information transmission intelligence each other is superimposed upon on the direct supply, its communication means is such: alarm controller carries out signaling by the fire detector address to fire detector, receives back sign indicating number then.When communicating, generally send voltage signal by alarm controller, fire detector therein the superimposed current signal to reply.
At present, the subject matter that the automatic fire alarm detection system faces is the time that the warning message of alarm should be lacked as far as possible to be transferred to controller.The method that adopts equipment alarm information inquiry one by one can shorten supervision time of individual equipment by improving bus speed, no doubt can improve response speed, but system cost, power consumption and reliability will be affected, and the amplitude of shortening response time can be very not big yet.
The applying date is on Dec 2nd, 1999, application number is 99114584.4, publication number is CN1296245A, name is called " a kind of two-bus communication and use the fire alarm system of this method ", proposed a kind of addressed location in each detection bus loop to be divided into groups, after the addressed location with fire alarm interrupt priority produces fire alarm, on the position of signaling position correspondence, return the group number pulse to alarm controller by two buses, number pulse in the passback group on going back to corresponding position, sign indicating number position, alarm controller calculates the address number of the addressed location that produces fire signal according to numbering in group number and the group and reports to the police.The essence of this scheme, still touring the detection, just the reception and the transmission of this signal are divided into groups, transmission time when adopting method of grouping can shorten the warning of individual equipment at double, but increase along with the slave unit number of reporting to the police simultaneously, repeatedly the inquiry address of reporting to the police is tending towards slowly network speed, and the address that this mode can only alarm verification, can not transmit the data of prior information.Therefore, though can play the effect of timely warning to a certain extent, can't be from changing the drawback that warning message lags behind in essence.
Summary of the invention
The present invention is exactly at the slow weakness of present warning message transmission, proposes a kind of new warning message testing circuit, and the alarm information transmission method that uses this warning message testing circuit, can react and transmit rapidly warning message rapidly.
A kind of two-wire system communication bus equipment, comprise the main equipment 1 and a plurality of slave units 2 that connect by two-wire system serial communication bus 3, described main equipment 1 comprises microprocessor 5, comparator circuit 4, the power supply of two different magnitudes of voltage, gauge tap 13 and the current source 15 that is connected on the comparator circuit positive input, the serial port input RX of described microprocessor connects the output terminal of a comparator circuit, opening of output TX gauge tap 13 closed, and described power supply is responsible for bus level is provided; Described slave unit 2 comprises microprocessor 6, comparator circuit 11, and the RX input end of microprocessor 6 connects the output terminal of comparator circuit 11, and comparator circuit receives bus 3 signals by rectifier bridge 12; It is characterized in that, described slave unit 2 also comprises a conflict monitoring circuit and a conflict lockout circuit, described conflict monitoring circuit receives bus state signal, compare with microprocessor serial port output TX signal, the conflict lockout circuit receives the comparative result of conflict monitoring circuit, carry out computing with the output signal of microprocessor serial port output TX, the output control signal, opening of gauge tap 14 closed.
Described two-wire system communication bus equipment, its conflict monitoring circuit, comprise XOR circuit 7 and comparator circuit 8, the positive input of described comparator circuit 8 connects the output terminal of rectifier bridge 12, reverse input end connects voltage source 16, the serial port output TX end of its output terminal and microprocessor 6, common input end as XOR circuit.
Described two-wire system communication bus equipment, its lockout circuit that conflicts, comprise trigger 10 and NOR circuit 9, described trigger receives the output signal of collision detection circuit and the clock signal of microprocessor 6, its output is exported TX jointly as the input signal of NOR circuit 9 with the serial port of microprocessor 6, closes in order to opening of gauge tap 14.
Described two-wire system communication bus equipment, its trigger are rest-set flip-flop.
Owing to adopt for example such scheme, the slave unit prior information responds fast, can transmit warning message rapidly.Simultaneously, adopt such scheme, bus to have that low cost, slave unit prior information respond fast, the characteristics of two-way data communication, nonpolarity double bus connects between the master-slave equipment, network can be the arbitrary topology form, can connect 240 slave units, and total line length can reach 1.5km.
Description of drawings
Fig. 1 is the structural representation of the main equipment that uses of the present invention;
Fig. 2 is the structural representation of slave unit of the present invention;
Fig. 3 is a circuit diagram of the specific embodiment of the invention;
Fig. 4 is the control program process flow diagram of main equipment of the present invention;
Fig. 5 is the control program process flow diagram of slave unit of the present invention;
Fig. 6 normally patrols and examines bus correlation timing figure;
Fig. 7 is that two slave units of the present invention send prior information bus timing figure simultaneously
Fig. 8 is the synoptic diagram of the Manchester's cde that uses of the present invention.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
Shown in Fig. 1,2 and 3, be the two-wire system communication bus equipment that the present invention uses, comprise a main equipment 1 and a slave unit 2, main equipment 1 is connected by double bus 3 with slave unit 2.Main equipment can be the controller of fire protection alarm system or safety-protection system, realizes the failure message of system and the inquiry of warning message.This main equipment 1 comprises microprocessor 5, comparator circuit 4, the power supply of two different magnitudes of voltage and gauge tap 13, the serial port of microprocessor 5 input RX connects the output terminal of a comparator circuit, and the serial port output TX gauge tap 13 of microprocessor 5 is controlled it and opened and close, this power supply is a power supply and the power supply that 7 volts of voltages are provided that 24 volts of voltages are provided, be responsible for bus level is provided, also comprise the unidirectional conducting current source of a 20mA in this circuit, be connected between 7 volts of voltage sources and the bus.Voltage source in addition and sample resistance constitute the sample circuit of 15mA electric current.
This lockout circuit that conflicts, form by trigger 10 and NOR circuit 9, this trigger receives the output signal of collision detection circuit and the clock signal of microprocessor 6, and the TX output terminal of its output and microprocessor 6 closes in order to opening of gauge tap 14 jointly as the input signal of NOR circuit 9.
Above-mentioned trigger is a rest-set flip-flop.
In the process of patrolling and examining, slave unit reports main equipment with information, finishes transmission of Information.
As shown in Figure 1, the serial port of the main equipment microprocessor 5 that the present invention uses output TX and input RX are connected on the double bus 3 by interface, connect power supply simultaneously and give bus node 2 power supplies.In microprocessor 5, store the main equipment control program, its process flow diagram is as shown in Figure 4.
The slave unit that the present invention uses comprises microprocessor 6, and serial port output TX and input RX are by interface connecting bus 3, and XOR circuit 7 and comparator circuit 8 constitute the conflict monitoring circuit, and NOR circuit 9 and RS latch cicuit 10 constitute the conflict lockout circuit.In microprocessor 6, store the slave unit control program, its process flow diagram is as shown in Figure 5.
Among the present invention, main equipment circular test slave unit, it when sending out the high level position alarm power supply, and provide the intermediate level of current limliting for alarm transmission information, as Fig. 1, microprocessor 5 TX gauge tap 13, output 24V when 13 closures, bus output 7V voltage during disconnection, 24 volts relative 7 volts is high level.
Between high period, main equipment 1 is slave unit 2 power supplies, and when 7V exported, main equipment provided the current driving ability of 20mA, and the driving that provides of information is provided for detector.
The present invention divides the response message of slave unit, warning message is set to prior information, all the other response messages are general information, prior information has precedence over general responses information, in each polling period, before slave unit is patrolled and examined the sequential of replying, a prior information time slot is set, this prior information time slot is used for starting the transmission prior information specially, assurance in each polling period, can send a prior information to the timely response and the processing of emergency condition, also can send several prior informations, this is specifically determined according to actual conditions by the user.In the present embodiment, be chosen in and send a prior information in the polling period.
The information and patrol and examine response message of patrolling and examining of the present invention is transmitted by the mode of two-wire system USB (universal serial bus).This is patrolled and examined information and patrols and examines response message and works out by the Manchester's cde mode.As shown in Figure 8, be the sign indicating number shape figure of a Manchester's cde, this Methods for Coding can have multiple, promptly can realize by software coding, also can realize by hardware encoding, and in the art, this is a technique known, does not repeat them here.Manchester's cde is encoded as a kind of baseband signal commonly used, and its time is divided into equally spaced segment, and wherein every segment is represented a bit.Each short time itself is dimidiation again, and preceding half time period is for transmitted number the radix-minus-one complement that this time period transmits bit value, and what back half time period transmitted is bit value itself.As seen in a period of time, the total once variation of signal level of its intermediate point.Therefore carry the synchronizing information of signal transmission and do not need to transmit in addition synchronizing signal.Because the form that Manchester's cde uses radix-minus-one complement to add positive sign indicating number constitutes, and can carry out verification by turn, reliability that therefore can enhanced system.High and low level during main equipment information sends in the present invention evenly distributes, and has guaranteed that content and length that main equipment information sends can not impact the power supply of slave unit.
Can be seen that by Fig. 1 in the slave unit that the present invention uses, comprised XOR circuit 7 and comparator circuit 8, both constitute the conflict monitoring circuit, NOR circuit 9 and RS latch cicuit 10 constitute the conflict lockout circuit.When a plurality of equipment prior informations sent simultaneously, slave unit blocked by bus monitoring and conflict, and guaranteeing always has the prior information of an equipment successfully to send.
When system has only a prior information, can finish the prior information transmission at a polling period; There is N prior information when simultaneously, then can all send to main equipment at N polling period.Because bus can be finished the transmission of prior information at short notice, also can guarantee consistent high-level efficiency during many information collisions.
Be somebody's turn to do the realization principle that conflict is blocked below specifically once.
Shown in Fig. 6 and 7, slave unit of the present invention patrol and examine reply during, the 7v level of current limliting 15ma is provided by main equipment.
Slave unit receive main equipment patrol and examine order after, conflict monitoring and lockout circuit initialization:
When slave unit receives the order of patrolling and examining of main equipment, the CLR pin of the CPU6 control trigger 10 of slave unit is effective, trigger Q output low level, and the TX pin of slave unit CPU be high level at ordinary times, rejection gate 9 output low levels, switch 14 disconnects, bus maintenance 7V level.The comparative level of comparer 8 is 3V, compares the output high level with bus input voltage 7V.Two inputs of XOR gate 7 are all high level, the output conflict monitoring CO pin output low level of XOR gate.
CO pin output low level is monitored in conflict this moment, the locking signal output low level, and lockout circuit is inoperative.
When slave unit sent low level signal, the output and the TX of trigger 10 were all low level signal, rejection gate 9 output high level signals, and switch 14 closures, bus are pulled into the low level below the 3V down.This moment, the comparative level of comparer 8 was 3V, compared output low level with bus input voltage 7V.Two inputs of XOR gate 7 are all low level, and CO pin output low level is monitored in the output conflict of XOR gate.
CO pin output low level, locking signal output low level are monitored in conflict this moment.Lockout circuit is inoperative.
When slave unit output high level:
1, all slave units are all exported high level:
This moment, bus was a high level, and situation is identical during with initialization, and CO pin output low level is monitored in conflict, the locking signal output low level, and lockout circuit is inoperative.
2, there is output low level when other slave unit:
Because there is the slave unit output low level, this moment, bus pulled down to below the 3V comparer 8 output low levels, and TX is a high level, therefore two of XOR gate 7 one of input be that one of low level is high level, export high level, the trigger output high level that is triggered.No matter how TX changed rejection gate 9 and was blocked and is low level this moment.
CO pin output high level is monitored in conflict this moment, locking signal output high level, and lockout circuit is worked, and this slave unit stops data and sends, and no longer bus is exerted an influence.
This shows, on bus be a plurality of slave units and relation, a slave unit output low level signal is the low spot position, during all slave units output noble potentials, bus is a noble potential.
When having the slave unit of output noble potential and electronegative potential simultaneously on the bus, the conflict monitoring circuit of the slave unit of output noble potential works, block simultaneously output circuit immediately, thereby the slave unit that sends electronegative potential continues normal the transmission, and the bus waveform is not exerted an influence.
As Fig. 6 and Fig. 7, be respectively and normally patrol and examine the sequential chart that sends the bus of prior information with two slave units simultaneously, the left side is that main equipment sends information, and the right side is that slave unit sends information, and the centre is a slave unit prior information transmitting time groove.Main equipment sends the bus waveform of high level 24V, low level 7V, and slave unit receives by the comparator circuit 11 of figure one.Main equipment is put intermediate level with bus after patrolling and examining and being sent completely, and waits for that slave unit sends information.
As shown in Figure 7, when two slave units send prior information simultaneously, preceding four bit signal unanimities that send at the first and second two slave units as can be seen, the TX signal of first, second slave unit is consistent with bus through the signal that Fig. 3 comparator circuit 8 produces, therefore no conflict occurred.The TX of the 5th bit first equipment is a low level, and bus is drawn and is low level.And that the 5th of second equipment is high level is opposite through the level that comparator circuit 8 produces with bus, XOR gate 7 output high level, conflict lockout circuit RS trigger circuit 10 output high level signal such as Fig. 7 D of Fig. 3, second equipment stops output, complete transmission information such as Fig. 7 A, E and the F that has kept first equipment of the current signal of bus.
As a same reason, when more slave unit sends information simultaneously, owing to comprise unique address information in the prior information, therefore the preferential equipment that sends low level bit, to continue to send, miscellaneous equipment stops to send successively, and bus keeps a prior information transmission main equipment at last, wait until when patrol and examine next time, send the prior information of miscellaneous equipment one by one.
Slave unit is waited for the prior information time slot of 4 bit periods (T), transmitting apparatus status information.Slave unit TX exports high, and switch 14 disconnects, and bus keeps the 7V intermediate level, and slave unit output is low, switch 14 closures, and slave unit is from total line absorption 20mA electric current, and bus level pulls down to low level, and main equipment receives the current signal of bus by the comparator circuit 4 of Fig. 3.
The A of Fig. 7, B, C, D, E, F are the sequential chart that two slave unit prior information conflicts send.After bus message is sent completely, suppose to have two slave units of first, second to possess prior information simultaneously, its door sends simultaneously at the prior information time slot, the serial that the A of Fig. 7, B are respectively first equipment sends the level signal of mouthful TX and the locking signal that conflicts, the serial that the C of Fig. 7, D are respectively second equipment sends the level signal of mouthful TX and the locking signal that conflicts, and the E of Fig. 7, F are respectively voltage waveform and the detected current waveform of main equipment on the bus.
Warning message transmission plan science of the present invention, reliable operation can be made reflection fast to the variation of system at short notice, and personnel have saved valuable time for fire detection.Owing to adopt such scheme, bus has that low cost, slave unit prior information respond fast, the characteristics of two-way data communication, and nonpolarity double bus connects between the master-slave equipment, and network can be the arbitrary topology form, can connect 240 slave units, total line length can reach 1.5km.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (4)
1, a kind of two-wire system communication bus equipment, comprise the main equipment (1) and a plurality of slave units (2) that connect by two-wire system serial communication bus (3), described main equipment (1) comprises microprocessor (5), comparator circuit (4), the power supply of two different magnitudes of voltage, gauge tap (13) and be connected on the current source (15) of comparator circuit positive input, the serial port input RX of described microprocessor connects the output terminal of a comparator circuit, opening of output TX gauge tap 13 closed, and described power supply is responsible for bus level is provided; Described slave unit
(2) comprise microprocessor (6), comparator circuit (11), the RX input end of microprocessor (6) connects the output terminal of comparator circuit (11), and comparator circuit receives bus (3) signal by rectifier bridge (12); It is characterized in that, described slave unit (2) also comprises a conflict monitoring circuit and a conflict lockout circuit, described conflict monitoring circuit receives bus state signal, compare with microprocessor serial port output TX signal, the conflict lockout circuit receives the comparative result of conflict monitoring circuit, carry out computing with the output signal of microprocessor serial port output TX, the output control signal, opening of gauge tap (14) closed.
2, two-wire system communication bus equipment as claimed in claim 1, it is characterized in that described conflict monitoring circuit, comprise XOR circuit (7) and comparator circuit (8), the positive input of described comparator circuit (8) connects the output terminal of rectifier bridge (12), reverse input end connects voltage source (16), the serial port output TX end of its output terminal and microprocessor (6), common input end as XOR circuit.
3, two-wire system communication bus equipment as claimed in claim 1 or 2, it is characterized in that described conflict lockout circuit, comprise trigger (10) and NOR circuit (9), described trigger receives the output signal of collision detection circuit and the clock signal of microprocessor (6), its output is exported TX jointly as the input signal of NOR circuit (9) with the serial port of microprocessor (6), closes in order to opening of gauge tap (14).
4, two-wire system communication bus equipment as claimed in claim 3 is characterized in that described trigger is a rest-set flip-flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02129002 CN1201272C (en) | 2002-08-23 | 2002-08-23 | Alarm information transmission method and two-wire system communication bus equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02129002 CN1201272C (en) | 2002-08-23 | 2002-08-23 | Alarm information transmission method and two-wire system communication bus equipment |
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| Publication Number | Publication Date |
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| CN1477604A CN1477604A (en) | 2004-02-25 |
| CN1201272C true CN1201272C (en) | 2005-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02129002 Expired - Fee Related CN1201272C (en) | 2002-08-23 | 2002-08-23 | Alarm information transmission method and two-wire system communication bus equipment |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819710B (en) * | 2010-03-30 | 2011-12-21 | 西安盛赛尔电子有限公司 | Two-way serial communication protocol based communication method for fire alarm system |
| CN103077575B (en) * | 2012-11-01 | 2015-09-23 | 深圳市泛海三江电子有限公司 | Sensor access bus protocol |
| CN103092801A (en) * | 2013-01-29 | 2013-05-08 | 北京强联通讯技术有限公司 | Bus power supply communication method |
| CN106297145A (en) * | 2016-08-29 | 2017-01-04 | 合肥康胜达智能科技有限公司 | A kind of fire protection warning monitoring system |
| KR102401481B1 (en) | 2017-12-22 | 2022-05-24 | 삼성전자주식회사 | Appliances and control method thereof |
| CN109617825B (en) * | 2018-11-30 | 2022-03-25 | 京信网络系统股份有限公司 | Message processing device, method and communication system |
| CN111813723B (en) * | 2020-09-02 | 2021-02-02 | 深圳市英美华科技有限公司 | Power bus data transmission method and device and computer readable storage medium |
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2002
- 2002-08-23 CN CN 02129002 patent/CN1201272C/en not_active Expired - Fee Related
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| CN1477604A (en) | 2004-02-25 |
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Granted publication date: 20050511 Termination date: 20170823 |