CN1153150C - Bidirectional transmission method and equipment for multiple groups of measuring and controling information by two-line power supply - Google Patents
Bidirectional transmission method and equipment for multiple groups of measuring and controling information by two-line power supply Download PDFInfo
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- CN1153150C CN1153150C CNB021021171A CN02102117A CN1153150C CN 1153150 C CN1153150 C CN 1153150C CN B021021171 A CNB021021171 A CN B021021171A CN 02102117 A CN02102117 A CN 02102117A CN 1153150 C CN1153150 C CN 1153150C
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Abstract
The present invention relates to a method and a device for transmitting wired measure and control information. A host machine is directly connected with a plurality of measure and control units through two transmission wires; a main transceiver changes a reversing wire, a transmitting wire and a ground wire of a serial port of a computer into two wires which are responsible for the power supply and the bidirectional information transmission of all on-line measure and control units, namely that the main transceiver transmits data pulse signals to the measure and control units, changes current signals transmitted by the measure and control units to voltage signals and transmits the voltage signals to the computer. The host machine transmits orders to the two transmission wires in a voltage variation mode, and the measure and control units receive the orders and do corresponding work. After the measure and control units receive the orders transmitted by the host machine, the measure and control units check self addresses and do the work of measure, control and data transmission according to requirements of the orders, and work results transmit data to the host machine in a current changing mode. The present invention has the advantages of simple and quick installation and easy, safe and simple adjustment and maintenance, the host machine and the measure and control units are directly connected through the transmission wires in a nonpolarity mode, and the measure and control units do not need a power source; the present invention is suitable for occasions requiring measure and control with long connection wires, large area and multiple bits.
Description
(1) technical field: the present invention is a kind of wired observing and controlling information transferring method and device, is applicable to long line, large tracts of land, many groups position measurement control occasion, as the TT﹠C system of bulk storage plant, the kilowatt meter reading-out system of residential quarters etc.
(2) background technology: existent method is according to relevant communications protocol with device at present, be connected through transmission line with many extension sets by host computer, every extension set articulates a plurality of measuring elements (quantity generally is no more than 128, and distance generally is no more than 100 meters) more then.Its shortcoming is to be necessary for every extension set to be equipped with independent working power, complicated integral structure, and installation is bothersome, technical requirement is high.
(3) summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of two wires power supply many groups observing and controlling information bidirectional transmission method and device, to accomplish except that main frame, need not to be equipped with other power supplys, main frame can directly be connected with a plurality of measurement and control units, one-piece construction is simple, and it is convenient to install, and technical requirement is not high.
The inventive method is as follows: form main frame by computing machine and main transceiver, form a measurement and control unit by a microprocessor and microprocessor peripheral circuit, main frame directly is connected with a plurality of measurement and control units by two transmission lines, main transceiver is received serial ports of computers, send out, the three-way two wires that is transformed into, ground, undertake the power supply and the bidirectional transfer of information of all online monitoring method unit, be that main transceiver is to measurement and control unit output data pulse signal and the current signal that measurement and control unit is sent here is become voltage signal export to computing machine, main frame sends instructions on two transmission lines in the change in voltage mode, after measurement and control unit is received the instruction that main frame sends, check self address, and do measurement by command request, control and data transmission work, working result arrives main frame with the electric current variation pattern with data transfer, during transmission-line voltage changed, it was in running order to keep measurement and control unit by the storage capacitor in the measurement and control unit.
The structure of apparatus of the present invention is as follows:
1, whole device includes a main frame 1, two transfer wires 2 and 3,1～10000 measurement and control units 4 that are parallel on transfer wire 2 and 3 of being connected with main frame 1,
2, main frame 1 contains a robot calculator and the main transceiver that is connected with this computing machine, and each measurement and control unit 4 contains a microprocessor and its microprocessor linked peripheral circuit,
3, main transceiver contain one forward (promptly by the direction of main frame) output data pulse signal towards measurement and control unit and can with reverse (promptly by the direction of measurement and control unit) towards main frame the input the electric current letter become the circuit that voltage signal is exported to computing machine, the forward input port RD of main transceiver is connected with the data sending terminal of computer serial communication interface through after the level conversion, the forward output port WR of main transceiver is connected with the data receiver of computer serial communication interface through after the level conversion, the forward input port GND of main transceiver is a common ground, be connected with the earth terminal of computer serial communication interface, and the I/O1 port of main transceiver (promptly forward exporting reverse input port 1) is connected with transfer wire 2, the I/O2 port of main transceiver (promptly forward exporting reverse input port 2) is common ground GND, be connected with transfer wire 3
4, microprocessor peripheral circuit is by regulator rectifier circuit, forward data pulse signal is picked up circuit and revers voltage-current conversion circuit composition, two input ends of regulator rectifier circuit are connected with 3 with transfer wire 2 respectively, two output terminals of regulator rectifier circuit are parallel with storage capacitor and are connected with the power input of microprocessor, forward the data pulse signal input end of picking up circuit is connected with the output terminal of rectification circuit, and output terminal is connected with the RD port (being the Data Receiving port) of microprocessor, and the input end of voltage-to-current translation circuit is connected with the WR port (being the data sending terminal mouth) of microprocessor, and output terminal is connected with the output terminal of rectification circuit.
When apparatus of the present invention are used, according to actual needs with each measurement and control unit and corresponding sensing elements (as probes such as temperature, humidity, infrared, air-sensitives), executive circuit (as photoelectricity coupling drive circuit, relay circuit control circuit etc.) connection.Transfer wire 2 and 3 is preferably a single-core shielding line (screen layer is as earth terminal).
Apparatus of the present invention have realized two wires power supply, bidirectional transfer of information.Main transceiver provides power supply by two transmission lines for a plurality of measurement and control units, and the microprocessor in the measurement and control unit operates under the low power consumpting state, and the working current of single measurement and control unit is 40 μ A; Calculate with 10000 measurement and control units, the bus static working current is less than 500mA.
The main transceiver circuit with the serial ports of computers sending and receiving, the three-way two wires that is transformed into, undertake the power supply and the bidirectional transfer of information of all online monitoring method unit, communication distance greater than 2000 meters, the sum that can articulate measurement and control unit can be up to 10000, measurement and control unit can be used for purposes such as measurement, control by different programmings.
After measurement and control unit enters measurement or state of a control, by self address number order time-sharing work, main frame forward sends instructions on two transmission lines in change in voltage mode (speed is greater than 1200bps), measurement and control unit is done relevant work after receiving instruction, during transmission-line voltage changes, it is in running order that storage capacitor in the measurement and control unit is kept measurement and control unit, after measurement and control unit is received the instruction that main frame sends, check self address, and do measurement by command request, work such as control and data transmission, working result arrives main frame so that electric current variation pattern (speed is greater than 1200bps) is reverse with data transfer.
The principle of work of main frame:
1. Host Command sends:
Computer command in the main frame through being imported by main transceiver RD mouth after the level conversion, generates forward data pulse at the I/O1 of main transceiver port through the data sending terminal output of serial communication interface, sends on two transmission lines that link to each other with measurement and control unit.
2. host data receives:
By the reverse data current that transmits of measurement and control unit, the I/O2 port input by main transceiver is transformed into voltage data through main transceiver, by the data receiver that is sent to the computer serial communication interface after the WR mouth process level conversion.
The principle of work of measurement and control unit:
1. power supply:
Two transmission lines that link to each other with main frame are for all online monitoring method unit provide working power.
2. signal receives:
The forward data pulse that main frame sends is picked up through inspection, is sent to microprocessor RD port, and microprocessor is made corresponding processing after receiving order.
3. signal sends:
After microprocessor is finished the task of appointment, as receive the data command that calls that main frame sends, microprocessor WR port sends data, and is transformed into the backward current signal and sends on two transmission lines that are connected with main frame.
Advantage of the present invention:
Main frame and a plurality of measurement and control units directly are connected through two transmission lines are nonpolarity, except that main frame, need not be equipped with other power supplys, install simple and convenient, debugging maintenance is easy, transmission line operating voltage low current is little, security performance good, and that system constitutes is simple, cost performance is high, the purposes scope wide, be applicable to long line, large tracts of land, many groups position are measured, the occasion of control.
(4) description of drawings:
Fig. 1 is the electric theory diagram of apparatus of the present invention.
Fig. 2 is the electrical schematic diagram of embodiment.
(5) embodiment: see the embodiment that Fig. 2 is illustrated.
Circuit among Fig. 2 in the frame of broken lines 5 is a main transceiver.The main transceiver circuit by a routine collect (emitter following) circuit altogether, a grounded emitter circuit is formed.Conventional (emitter following) circuit of collection altogether is connected into by transistor BG2, and grounded emitter circuit is connected into by transistor BG1.The base stage of BG2 meets the forward input port RD of main transceiver, and this port is connected with the data sending terminal of computer serial communication interface through after the level conversion.Electric current is picked up the resistance R cross-over connection in the base loop of BG1.When the electric current of R changed, the base loop voltage of BG1 changed thereupon, produces change in voltage on the collector of BG1, and the WR port is connected with the data receiver of computer serial communication interface through after the level conversion.
4 is measurement and control unit among Fig. 2, microprocessor peripheral circuit wherein comprises rectification circuit B1, the mu balanced circuit of being made up of BG3, R5, Z1, storage capacitor C1, the forward data pulse signal of being made up of R6 and R7 are picked up circuit, revers voltage-current conversion circuit of being made up of BG4, R8.
In Fig. 2, BG1～BG4 is transistor, and R1～R8 is a resistance, and Z1 is a voltage stabilizing diode.Microprocessor CPU in the measurement and control unit is a low-power scm.
In the embodiment circuit that provides, also can adopt the transistor device and the power supply of opposite polarity, reach identical functions.
Though what the embodiment circuit used is discrete device, also can use multiple device or corresponding integrated circuit to constitute the circuit of identical function.
Above embodiment device is successfully applied to " storage two-line intelligent module temp measuring system " among.This temp measuring system is used at how tame grain storage enterprise practical, and effect is good.
Above embodiment is only for the present invention is further illustrated, and scope of the present invention is not subjected to the limitation of illustrated embodiment.
Claims (4)
1, the many groups of a kind of two wires power supply observing and controlling information bidirectional transmission method, it is characterized in that: form main frame by computing machine and main transceiver, form a measurement and control unit by a microprocessor and microprocessor peripheral circuit, main frame directly is connected with a plurality of measurement and control units by two transmission lines, main transceiver is received serial ports of computers, send out, the three-way two wires that is transformed into, ground, undertake the power supply and the bidirectional transfer of information of all online monitoring method unit, be that main transceiver is to measurement and control unit output data pulse signal and the current signal that measurement and control unit is sent here is become voltage signal export to computing machine, main frame sends instructions on two transmission lines in the change in voltage mode, after measurement and control unit is received the instruction that main frame sends, check self address, and do measurement by command request, control and data transmission work, working result arrives main frame with the electric current variation pattern with data transfer, during transmission-line voltage changed, it was in running order to keep measurement and control unit by the storage capacitor in the measurement and control unit.
2, the many groups of a kind of two wires power supply observing and controlling information bidirectional transmitting device is characterized in that:
A, whole device include a main frame (1), two transfer wires (2 and 3) that are connected with main frame (1), and 1～10000 measurement and control unit (4) that is parallel on said two transfer wires (2 and 3),
B, main frame (1) contain a robot calculator and the main transceiver that is connected with this computing machine, and each measurement and control unit (4) contains a microprocessor and connected microprocessor peripheral circuit,
C, main transceiver contains a forward output data pulse signal and the electric current letter of reverse input can be become the circuit that voltage signal is exported to computing machine, the forward input port (RD) of main transceiver is connected with the data sending terminal of computer serial communication interface through after the level conversion, the forward output port (WR) of main transceiver is connected with the data receiver of computer serial communication interface through after the level conversion, another of main transceiver forward input port (GND) is common ground, be connected with the earth terminal of computer serial communication interface, and the reverse input port of forward output (I/O1) of main transceiver is connected with a transfer wire (2), the reverse input port of forward output (I/O2) of main transceiver is common ground (GND), be connected with another transfer wire (3)
D, microprocessor peripheral circuit is by regulator rectifier circuit, forward data pulse signal is picked up circuit and revers voltage-current conversion circuit composition, two input ends of regulator rectifier circuit are connected with two transfer wires (2 and 3) respectively, two output terminals of regulator rectifier circuit are parallel with storage capacitor and are connected with the power input of microprocessor, forward the data pulse signal input end of picking up circuit is connected with the output terminal of rectification circuit, and output terminal is connected with the Data Receiving port (RD) of microprocessor, and the input end of voltage-to-current translation circuit is connected with the data sending terminal mouth (WR) of microprocessor, and output terminal is connected with the output terminal of rectification circuit.
3, as the many groups of the said two wires power supply of claim 2 observing and controlling information bidirectional transmitting device, it is characterized in that: form altogether by collector, a grounded emitter circuit by a routine for the main transceiver circuit.
4, as the many groups of the said two wires power supply of claim 3 observing and controlling information bidirectional transmitting device, it is characterized in that: conventional collector altogether is connected into by transistor (BG2), grounded emitter circuit also is connected into by transistor (BG1), altogether the base stage of the transistor (BG2) of collector connects an input port (RD) forward of main transceiver, and electric current is picked up resistance (R) cross-over connection in the base loop of the transistor (BG1) of grounded emitter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021021171A CN1153150C (en) | 2002-01-10 | 2002-01-10 | Bidirectional transmission method and equipment for multiple groups of measuring and controling information by two-line power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021021171A CN1153150C (en) | 2002-01-10 | 2002-01-10 | Bidirectional transmission method and equipment for multiple groups of measuring and controling information by two-line power supply |
Publications (2)
| Publication Number | Publication Date |
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| CN1360263A CN1360263A (en) | 2002-07-24 |
| CN1153150C true CN1153150C (en) | 2004-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021021171A Expired - Fee Related CN1153150C (en) | 2002-01-10 | 2002-01-10 | Bidirectional transmission method and equipment for multiple groups of measuring and controling information by two-line power supply |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101562925B (en) * | 2008-04-17 | 2012-11-28 | 锦鑫光电股份有限公司 | Signal reading method based on DMX512 protocol |
| CN101662372B (en) * | 2008-08-29 | 2011-12-21 | 王安军 | Serial bus system of party-line transmitting of information and power |
| TWI505657B (en) * | 2011-10-21 | 2015-10-21 | Chicony Electronics Co Ltd | Power line communication method and electronic system and electronic device using the same |
| CN108964718B (en) * | 2018-08-03 | 2022-05-03 | 深圳市磊芯半导体有限公司 | Bidirectional signal transmission system and equipment management method thereof |
| CN110504983B (en) * | 2019-08-27 | 2021-06-08 | 深圳天地宽视信息科技有限公司 | Circuit control system, method and medium for integrating main machine and machine of indoor unit |
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Owner name: KUNMING CITY GRAIN AND OIL PURCHASE AND SALE CO., Free format text: FORMER NAME OR ADDRESS: KUNMING-CITY GRAINS-OIL STORAGE AND TRANSPOTATION CO |
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Address after: 650041 No. 26, Civil Aviation Road, Yunnan, Kunming Patentee after: Kunming cereals and oils purchase and sale Co., Ltd. Address before: 650041 Kunming grain and oil storage and transportation company, No. 26, Civil Aviation Road, Yunnan, Kunming Patentee before: Kunming-City Grains-Oil Storage and Transpotation Co |
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