CN2342522Y - DC power modulated digital communication device - Google Patents
DC power modulated digital communication device Download PDFInfo
- Publication number
- CN2342522Y CN2342522Y CN 98234989 CN98234989U CN2342522Y CN 2342522 Y CN2342522 Y CN 2342522Y CN 98234989 CN98234989 CN 98234989 CN 98234989 U CN98234989 U CN 98234989U CN 2342522 Y CN2342522 Y CN 2342522Y
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- CN
- China
- Prior art keywords
- circuit
- transmission line
- digital communication
- power supply
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Bidirectional Digital Transmission (AREA)
Abstract
The utility model provides a DC power modulating type digital communication device which is composed of an A terminal and a B terminal signal circuits, a decoding circuit, a duplexer, a transmission line, etc. The utility model is characterized in that a single end transmission circuit connecting mode is adopted, and each transmitting terminal port at A and B terminals is respectively connected with a pull-up resistance R which can directly connect a DC power supply to the transmission line. The circuits has strong interference resisting abilities, and circuit structures are simplified. Simultaneously, the power management mode of digital communication centralized power supply can also be realized, the electric power consumption of the circuits is lowered, and the circuit cost is reduced.
Description
The utility model relates to the Digital Transmission communications field, particularly a kind of DC power supply modulation system digital communication apparatus.
Existing digital communication apparatus, be to adopt both-end transmission means (see figure 1), it is example that its operation principle is sent signal with the A end, A end signal circuit sends a string rectangular signal of being made up of the height potential change, arrive B end decoding circuit through transmission line, because transmission line distributed capacitance and line resistance influence deform signal.When transmission line is dual-hinge line, introduce electromagnetic interference easily especially, promptly some non-signal potentials of superposition change on transmission line, cause decoding circuit can't receive correct signal, produce error code or communication failure.In practicality, in order to overcome the problems referred to above, adopted following scheme: 1. use the hermetic type coaxial cable as transmission line, though can significantly reduce like this or shield electromagnetic interference, but its material cost, construction and maintenance cost then increase greatly, only are applicable to large-scale digital communication equipment.2. increase drive circuit at transmitting terminal, increase at receiving terminal and isolate and anti-interference, shaping circuit (seeing shown in Figure 2).Still there are two problems owing to increased the circuit corresponding function pointedly in such scheme so can use in practice, and the one, the circuit cost height, power consumption increases; The 2nd, though certain antijamming capability is arranged, because the high resistant characteristic of decoding circuit and both-end are " suspension " state when being transmitted in no signal, to the highstrung characteristic of interference signal, the error rate is still higher in actual applications.
The purpose of this utility model provides a kind of single-ended transmission communication mode, improves the antijamming capability of circuit when simplifying circuit, and practical again digital communication apparatus with low cost.
Technical solution of the present utility model is such: duplexer, signal circuit and decoding circuit etc. by A end signal circuit, decoding circuit, duplexer, transmission line and B end constitute, feature is to adopt the single-ended transmission circuit connecting mode, is connected to an energy respectively and DC power supply directly is connected to the pull-up resistor R that improves the circuit antijamming capability on the transmission line on each transmit port of A, B end.
The utility model utilizes the DC power supply filtration very strong to interference signal (filtering) characteristic simultaneously owing to adopted the circuit connecting mode of single-ended transmission, so not only simplified circuit structure greatly, has reduced circuit cost.While has also been improved the antijamming capability of circuit greatly, has overcome exist in the prior art many not to be, thereby has effectively improved circuit reliability and practicality.
Below in conjunction with accompanying drawing the utility model is illustrated.
Fig. 1 is the prior art circuits block diagram;
Fig. 2 is another prior art circuits block diagram;
Fig. 3 is the utility model circuit theory diagrams.
As shown in Figure 3: constitute by A, B end signal circuit, decoding circuit, duplexer, transmission line etc.Embodiment of the present utility model is on the basis of existing technology, the deficiency that transmission is subject to disturb at both-end, this circuit of circuit connecting mode of proposition single-ended transmission.Being different from general single-ended transmission mode, is to connect an energy respectively DC power supply directly to be connected to the pull-up resistor R that improves the circuit antijamming capability on the transmission line on each transmit port of A, B end.Adopt this connecting mode, can utilize the DC power supply filtration very strong (filtering) characteristic, improve the circuit antijamming capability greatly interference signal.Because signal is that superposition transmits on supply voltage, so image is called the DC power supply modulation.
Each signal and decoding circuit are public digital telecommunication circuit among the utility model Fig. 3, wherein the signal circuit way of output can be a triode, duplexer among the figure is the signal device, generally can realize that with the signal and the decoding circuit of end duplex acts on by sequencing control in actual applications.
The utility model carries out the communication of RS-485 form by the connecting mode of Fig. 3, and wherein transmission line is selected the 1KM dual-hinge line for use.In the communication with in, the short-wave signal source disturbs (output 500MW continuous wavelength, Distance Transmission line or arbitrary end 1.0CM), after opening with 500 watts of carbon brush motors, apart from transmission line and arbitrary end 1.0CM interference, both-end does not have error code with 9600 speed rates.
Claims (1)
- A kind of DC power supply modulation system digital communication apparatus, constitute by A end signal circuit, decoding circuit, duplexer transmission line and B end signal circuit, decoding circuit, duplexer etc., it is characterized in that: adopt the single-ended transmission circuit connecting mode, on each transmit port of A, B end, be connected to an energy respectively and DC power supply directly be connected to the pull-up resistor R that improves the circuit antijamming capability on the transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98234989 CN2342522Y (en) | 1998-09-02 | 1998-09-02 | DC power modulated digital communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98234989 CN2342522Y (en) | 1998-09-02 | 1998-09-02 | DC power modulated digital communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2342522Y true CN2342522Y (en) | 1999-10-06 |
Family
ID=33983389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98234989 Expired - Fee Related CN2342522Y (en) | 1998-09-02 | 1998-09-02 | DC power modulated digital communication device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2342522Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316790C (en) * | 2003-03-21 | 2007-05-16 | 华为技术有限公司 | Ethernet non-magnetic point-to-point connection method |
-
1998
- 1998-09-02 CN CN 98234989 patent/CN2342522Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316790C (en) * | 2003-03-21 | 2007-05-16 | 华为技术有限公司 | Ethernet non-magnetic point-to-point connection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |