CN2188826Y

CN2188826Y - communication interface

Info

Publication number: CN2188826Y
Application number: CN 93237885
Authority: CN
Inventors: 汪立森; 梁大志
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-02
Filing date: 1993-11-02
Publication date: 1995-02-01
Anticipated expiration: 2003-11-02

Abstract

The utility model discloses a double-bus remote power feeding communication interface in any polarity which is composed of a control circuit CZQ, a detection circuit JC, a remote power feeding regulation circuit YG/TZ, a double-bus RZX, a polarity changing circuit JX, a signal separation circuit SF, a confirmation circuit ZS, a decoder YMQ, and a detector TCQ. The utility model is characterized in that the syntenic transmission of a time-sharing multiple access coding pulse signal and a remote power feeding power supply is achieved on the double-bus whose load is connected with the double-bus in parallel and in any polarity. The utility model can be used in a place accompanied with various state changes of physical and chemical quantity; the parametric value of a digital quantity, or the switch values of limit exceeding, protection, smoke-sensing, constant temperature, prevention of burglary, calling for help, fault, etc. can be obtained through detecting and monitoring the places.

Description

communication interface

The utility model relates to a kind of two line communication interface.

Normal state variation in industries such as oil, chemical industry, electric power, metallurgy, medical treatment, fire-fighting, amusement with various physical quantitys and chemistry amount, by surveying and monitor the variation of these states, obtain the parameter value of switching value such as out-of-limit, protection, cigarette sense, constant temperature, antitheft, calling for help, fault or digital quantity, to reflect on-the-spot situation.Usually need be sent to these parameter values like clockwork in the km computer in addition and go, computer then selects one of them to carry out analyzing and processing from hundreds of acquisition sensors, and the power supply of enough capacity is provided for on-the-spot all acquisition sensors.The transmission of parameter value and power supply is the form with interface, and computer and scene are connected closely.The present general wire transmission mode that adopts on the engineering, its circuit mature and reliable, be convenient to safeguard, antijamming capability is strong.Interfaces such as multiple-way system bus, three buses, two buses and RS232/RS422 universal serial bus are arranged in form, two common bus interface system antijamming capabilities are strong, communication distance is far away, but two bus interface systems in the market, on bus, can not provide Remote Power Supply, polar requirement is installed.

Task of the present utility model provides the not communication interface of polarity, coded pulse signal and the collinear transmission of Remote Power Supply of a kind of two bus time division multiple accesses.

The utility model is to realize like this, a kind of two-bus remote of being made up of control circuit, two bus RZX, decoder, detector is for being regardless of the polarity communication interface, it is characterized in that also being connected with testing circuit JC between control circuit CZQ and the two bus RZX, far supplying modulation circuit YG/TZ, polarity transformation circuits JX, demultiplexing circuit SF, validating circuit ZS are arranged between two bus RZX and the decoder SF.Control circuit CZQ is connected for the resistance R 6 among the modulation circuit YG/TZ with far away through time division multiple access coded pulse signal BM line, integrated circuit N1(LM317 among the testing circuit JC) the 2nd pin with far away for integrated circuit N2(LM317 in the modulation circuit) the 1st pin be connected, its the 1st pin, the 2nd pin is connected with control circuit CZQ, the 3rd pin of integrated circuit N2, the earth terminal of resistance R 5 is connected with two bus RZX respectively, the common port of diode D2 and D1 among the polarity transformation circuits JX, the common port of D3 and D4 inserts two bus RZX respectively, the common port of diode D2 and D3 inserts validating circuit ZS through resistance R 9, the emitter of triode BG3 among the public termination validating circuit ZS of diode D1 and D4, R7 is connected with resistance R 9 in the validating circuit with the common port of triode BG2 collector electrode among the demultiplexing circuit SF, and the emitter of triode is connected with detector TCQ with decoder YMQ with the anodal common port of diode D5 with resistance R 8 among the demultiplexing circuit SF.Control circuit CZQ can make controller with traditional hardware circuit or computer circuits, and any circuit form that can satisfy the control requirement can.Decoder can be MC14530 codec circuit or 8031 single electric systems, and detector is a detecting sensor.

Far away for modulation circuit YG/TZ by integrated package N2(LM317), transistor BG1, resistance R 3, R4, R5, R6 constitute, Remote Power Supply voltage is provided, the Remote Power Supply voltage range is between 0～V2, and the time division multiple access coded pulse signal BM that control circuit is sent here is modulated on the Remote Power Supply voltage, the voltage range of coded pulse signal realizes the collinear transmission of coded pulse signal and Remote Power Supply between V2～V3.The course of work is, when BM is high level, and transistor BG1 conducting, resistance R 5 is by short circuit, and at this moment the output voltage of integrated package N2 is V2 by the voltage ratio decision of resistance R 3 with R4; When BM was low level, transistor BG1 ended, and at this moment the output voltage of integrated package N2 is the voltage ratio decision of resistance R 3 and R4+R5, is V3.

Testing circuit JC is by resistance R 1, R2, integrated package N1(LM317) constitute, be used for detecting the current increment that two bus RZX go up a certain moment, when two bus currents increase, pressure drop increases on the resistance R 1, " one " terminal voltage of integrated package N1 is descended, and be lower than detection reference voltage VREF, then integrated package N1 output confirms that detection signal 120 upsets are high level, and reflection is changed by call detection device presence states; When if two bus currents do not increase, then integrated package N1 output confirms that detection signal 120 keeps low level, and reflection is not changed by call detection device presence states.

Far away from the integrated package N2(LM317 among the modulation circuit YG/TZ) as two bus RZX drivers, low because of its output impedance, can improve bringing onto load and the antijamming capability of two-bus remote for communication interface.

Polarity transformation circuits JX is made up of diode D1, D2, D3, D4, finishes the conversion of two bus RZX being gone up power supply/signal polarity, makes the not access in parallel with it of polarity of load on the two bus RZX.

Demultiplexing circuit SF is made of capacitor C 2, resistance R 8, diode D5, transistor BG2, capacitor C 1, resistance R 7, and it is separated with far away the collinear time division multiple access coded pulse signal that transmits for DC power supply voltage.Wherein, capacitor C 2, resistance R 8, diode D5 are that pulse signal extracts circuit, and capacitor C 1, resistance R 7, transistor BG2 are parameter voltage stabilizator.Pulse signal extracts circuit the pulse signal of voltage range at V2～V3 is extracted, and the output signal of promptly encoding SIG send decoder YMQ.Here this circuit is not exerted an influence to the parameter voltage stabilizator output voltage is very important to the selection of parameter of diode D5, usually the voltage of voltage regulation value of diode D5 be chosen in Remote Power Supply voltage V2 near.Parameter voltage stabilizator is separated Remote Power Supply voltage, and the dc output power voltage VCC that separates is as the working power of decoder YMQ and detector TCQ.

Validating circuit ZS is made of resistance R 9, R10, transistor BG3, and it converts decoder YMQ comparative result AFF to current signal, sends into testing circuit JS analyzing and processing by two bus RZX.The course of work is, when the state that is detected of called detector TCQ changed, through decoder YMQ relatively, making AFF was high level, makes transistor BG3 conducting, and at this moment one pure load inserts resistance R 9 as two buses, and electric current increases on two buses.Otherwise the state of being detected does not change, and AFF is a low level, and electric current does not increase on two buses.

The utility model compared with the prior art, have that antijamming capability is strong, reliability is high, communication distance far, polarity is installed, power supply realizes far away from, strong, the ratio of performance to price advantages of higher of load capacity.

Accompanying drawing is the utility model electrical schematic diagram

In the accompanying drawing: control circuit CZQ, time division multiple access coded pulse signal BM, direct-current input power supplying voltage VIN confirms detection signal I20, detection reference voltage VREF, testing circuit JC, far away from modulation circuit YG/TZ, two bus RZX, polarity transformation circuits JX, demultiplexing circuit SF, validating circuit ZS, decoder YMQ, detector TCQ, coding output signal SIG, dc output power voltage VCC, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, capacitor C 1, C2, transistor BG1, BG2, BG3, diode D1, D2, D3, D4, integrated package N1, N2(LM317).

With the fire alarm system is example, further specifies the utility model in conjunction with the accompanying drawings.Control circuit CZQ sends different coded pulse signal BM in chronological order to the modulation circuit YG/TZ that supplies far away, remove modulation linearity voltage stabilizing circuit integrated package N1(LM317 by transistor BG1, resistance R 6, R5, R4, R3), realize the stack of coded pulse signal voltage and Remote Power Supply voltage, at this moment, the two bus RZX Remote Power Supply voltage range that goes up transmission between 0～V2, the coded pulse signal voltage range is between V2～V3.Owing to used linear voltage-stabilizing circuit integrated package N1(LM317) make bus driver, very low because of its output impedance, then can improve antijamming capability and the load-carrying ability of two bus RZX greatly.Two bus RZX go up the confession far away/code power voltage signal of transmission, through diode D1, D2, D3, the polarity transformation circuits that D4 constitutes, make the not access in parallel with it of polarity of load on two buses, conversion the confession far away/code power voltage signal after the polarity, in demultiplexing circuit by capacitor C 2, diode D5, the signal extracting circuit that resistance R 8 constitutes and by resistance R 7, capacitor C 1, the parameter voltage stabilizator that transistor BG2 constitutes, code signal voltage and Remote Power Supply voltage are separated, it is the output voltage of parameter voltage stabilizator not to be produced any influence that the parameter of diode D5 is selected to require, the dc output power voltage VCC that separates is as decoder and detector operation power supply, the coding output signal SIG that separates send decoder, decoder has also obtained the code signal voltage that detector converts measurement to be checked to simultaneously, decoder is deciphered comparison with two kinds of code signal voltages, whether the coding of judging two kinds of code signal voltages meets, if meet, then decoder is exported a high level, this level drives by resistance R 10 through resistance R 10, R9, the validating circuit ZS that transistor BG3 constitutes, between the coincidence pulse high period, transistor BG3 saturation conduction, then resistance R 9 is as a pure resistor load on two buses, electric current on this period two bus is increased, at this moment by resistance R 1, R2, "-" terminal voltage of the integrated package N1 of the testing circuit that integrated package N1 constitutes just can be less than "+" end detection reference voltage VREF, confirm that detection signal I20 is high level to control circuit, so the utility model is just judged like clockwork and some state of obtaining measurement to be checked reaches for information about.If do not meet, confirm that then detection signal I20 is low level to control circuit.

Claims

1, a kind of by control circuit, two buses, the two-bus remote that decoder and detector are formed is for being regardless of the polarity communication interface, it is characterized in that being connected to testing circuit JC between control circuit CZQ and the two bus RZX, far away from modulation circuit YG/TZ, between two bus RZX and the decoder YMQ polarity transformation circuits JX is arranged, demultiplexing circuit SF and validating circuit ZS, control circuit CZQ is connected for the resistance R 6 among the modulation circuit YG/TZ with far away through time division multiple access coded pulse signal BM line, the 2nd of integrated circuit N1 the (LM317) pin is connected with the 1st pin for integrated circuit N2 (LM317) in the modulation circuit far away among the testing circuit JC, its the 1st pin, the 2nd pin is connected with control circuit CZQ, the 3rd pin of integrated circuit N2, the earth terminal of resistance R 5 is connected with two bus RZX respectively, the common port of diode D2 and D1 among the polarity transformation circuits JX, the common port of D3 and D4 inserts two bus RZX respectively, the common port of diode D2 and D3 inserts validating circuit ZS through resistance R 9, the emitter of triode BG3 among the public termination validating circuit ZS of diode D1 and D4, R7 is connected with resistance R 9 in the validating circuit with the common port of the collector electrode of triode BG2 among the demultiplexing circuit SF, and the emitter of triode is connected with detector TCQ with decoder YMQ with the anodal common port of diode D5 with resistance R 8 among the demultiplexing circuit SF.

2, the two-bus remote according to claim 1 supplies to be regardless of the polarity communication interface, it is characterized in that by integrated package N2(LM317), transistor BG1, resistance R 3, R4, R5, R6 constitute far provides Remote Power Supply voltage for modulation circuit, time division multiple access coded pulse signal BM is modulated on the Remote Power Supply voltage, realizes the collinear transmission of coded pulse signal and Remote Power Supply.

3, according to the two-bus remote of claim 1 for being regardless of the polarity communication interface, it is characterized in that by resistance R 1, R2, integrated package N1(LM317) the testing circuit JC that constitutes, be used for detecting the current increment that two bus RZX go up a certain moment.

4, the two-bus remote according to claim 1 supplies to be regardless of the polarity communication interface, it is characterized in that polarity transformation circuits JX is made up of diode D1, D2, D3, D4, finish the conversion of two bus RZX being gone up power supply/signal polarity, make the not access in parallel with it of polarity of load of two bus RZX.

5, the two-bus remote according to claim 1 supplies to be regardless of the polarity communication interface, it is characterized in that demultiplexing circuit SF is made of capacitor C 1, C2, resistance R 7, R8, diode D5, transistor BG2, it is separated with far away the collinear multi-address coding pulse signal that transmits for DC power supply voltage, wherein the signal extracting circuit of capacitor C 2, resistance R 8, diode D5 formation send decoder YMQ voltage range at the coding output signal SIG of V2～V3.

6, the two-bus remote according to claim 1 or 6 supplies to be regardless of the polarity communication interface, the voltage of voltage regulation value that it is characterized in that diode D5 among the demultiplexing circuit SF be chosen in Remote Power Supply voltage V2 near, guarantee parameter voltage stabilizator dc output power voltage VCC not to be exerted an influence.

7, the two-bus remote according to claim 1 supplies to be regardless of the polarity communication interface, it is characterized in that the parameter voltage stabilizator that is made of capacitor C 1, resistance R 7, transistor BG2 among the demultiplexing circuit SF separates Remote Power Supply voltage, the dc output power voltage VCC that separates is as the working power of decoder YMQ and detector TCQ.

8, the two-bus remote according to claim 1 supplies to be regardless of the polarity communication interface, it is characterized in that validating circuit ZS is made of resistance R 9, R10, transistor BG3, and it converts the comparative result of decoder YMQ to current signal.