CN106899322A - A kind of 458 telecommunication circuits - Google Patents
A kind of 458 telecommunication circuits Download PDFInfo
- Publication number
- CN106899322A CN106899322A CN201710098817.0A CN201710098817A CN106899322A CN 106899322 A CN106899322 A CN 106899322A CN 201710098817 A CN201710098817 A CN 201710098817A CN 106899322 A CN106899322 A CN 106899322A
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- CN
- China
- Prior art keywords
- circuit
- communication
- sub
- common mode
- tvs pipe
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Dc Digital Transmission (AREA)
Abstract
The invention discloses a kind of 458 telecommunication circuit, including 458 communication chips, except common mode disturbances sub-circuit, drive sub-circuits, input circuit, photo-coupler and communication ends, also include TVS pipe, it is described except common mode disturbances sub-circuit, drive sub-circuits, input circuit and photo-coupler are electrically connected with 458 communication chips respectively, 458 communication chip is connected further through TVS pipe with communication ends, it is of the invention except common mode disturbances sub-circuit can effectively ensure that common-mode voltage be in 7~+12V in the range of, and prevent that electric current is excessive to cause original paper to damage by two TVS pipes.
Description
Technical field
The present invention relates to communication electronics field, and in particular to a kind of 458 telecommunication circuit.
Background technology
The RS-485 communication interfaces of electric energy meter configuration use differential circuit principle, extend driver and receiver is shared together
One multipoint application of line, allows to access 32 drivers and 32 receivers on the same line, collectively constitutes the communication that changes the outfit
Line.Communication logic is differential signal negative logic, and+2V~+6V represents " 1 " that -6V~-2V is represented " 0 ".RS485 has two-wire system and four
The two kinds of wiring of line system, four-wire system is full-duplex communication mode, but it is less use, two-wire system is half-duplex operation mode.
The half-duplex network of RS485 interfaces composition in electric energy meter, usually two-wire system, are transmitted using Shielded Twisted Pair more.
This mode of connection can at most mount 32 nodes for bus type topological structure on same bus.In RS485 communication networks
In be generally adopted by the host tape of master-slave communication mode, i.e., multiple slaves.In many cases, RS-485 communication links are connected
When simply " A ", " B " of each interface held with a pair of twisted-pair feeders simply couple together.
The content of the invention
(1) technical problem to be solved
In order to overcome prior art not enough, it is proposed that a kind of 458 telecommunication circuit.
(2) technical scheme
The present invention is achieved through the following technical solutions：The present invention proposes a kind of 458 telecommunication circuit, including 458 communication cores
Piece, except common mode disturbances sub-circuit, drive sub-circuits, input circuit, photo-coupler and communication ends, also include TVS pipe,
It is described except common mode disturbances sub-circuit, drive sub-circuits, input circuit and photo-coupler are electrical with 458 communication chips respectively
Connection, 458 communication chip is connected further through TVS pipe with communication ends.
Further, 458 communication chip is a difference transceiver suppressed with transient voltage.
Further, the TVS pipe model P4SMA6.
(3) beneficial effect
The present invention has the advantages that relative to prior art：
A kind of 458 telecommunication circuit that the present invention is mentioned, one, prevent common mode disturbances：It is of the invention except common mode disturbances sub-circuit
Can effectively ensure that common-mode voltage is in the range of -7~+12V, and prevent that electric current is excessive to be caused by two TVS pipes
Original paper is damaged；2nd, electromagnetic radiation is suppressed：The present invention is led to by setting one and returning in RS485 interface communication chip common modes part
The backward channel (signal ground) of the low-resistance of road, i.e., is effectively prevented electromagnetic radiation, it is ensured that the operation safety of intelligent electric meter.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
A kind of 458 telecommunication circuit as shown in Figure 1, including 458 communication chips, except common mode disturbances sub-circuit, drive son electricity
Road, input circuit, photo-coupler and communication ends, also include TVS pipe, described except common mode disturbances sub-circuit, driving
Circuit, input circuit and photo-coupler respectively with 458 communication chips be electrically connected with, 458 communication chip further through
TVS pipe is connected with communication ends.
Wherein, 458 communication chip is a difference transceiver suppressed with transient voltage；The TVS pipe model
P4SMA6。
A kind of 458 telecommunication circuit that the present invention is mentioned, the characteristic of RS485 has：(1) electrical characteristic of RS-485：Logical zero
Represented by+(2-6) V of the voltage difference of line-to-line；Logical one is represented by-(2-6) V of the voltage difference of line-to-line.Interface signal electricity
It is flat to be reduced than RS-232, the chip of interface circuit is just hardly damaged, and the level is compatible with Transistor-Transistor Logic level, can facilitate and TTL electricity
Road connects；(2) the data maximum transmission rate of RS-485 is 10Mbps；(3) RS-485 interfaces are using balance driver and difference
Divide the combination of receiver, anti-common mode disturbances ability strengthens, i.e., noise immunity is good；(4) maximum transmitted of RS-485 interfaces away from
It it is 4000 feet from standard value, actually up to 1219 meters, RS-232 interface only allows 1 transmitting-receiving of connection in bus in addition
Device, i.e., single station ability.And RS-485 interfaces are to allow to connect up to 128 transceivers in bus.There is multistation ability, this
Sample user can easily set up device network using single RS-485 interfaces.Because the half-duplex of RS485 interfaces composition
Network, it is general only to need two lines (being typically AB lines), so RS485 interfaces use Shielded Twisted Pair.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to structure of the invention
Think and scope is defined.On the premise of design concept of the present invention is not departed from, this area ordinary person is to technology of the invention
The all variations and modifications that scheme is made, all should drop into protection scope of the present invention, claimed technology contents of the invention,
All record in detail in the claims.
Claims (3)
1. a kind of 458 telecommunication circuit, it is characterised in that：Including 458 communication chips, except common mode disturbances sub-circuit, drive sub-circuits,
Input circuit, photo-coupler and communication ends, also include TVS pipe, described except common mode disturbances sub-circuit, driving son electricity
Road, input circuit and photo-coupler are electrically connected with 458 communication chips respectively, and 458 communication chip is further through TVS
Pipe is connected with communication ends.
2. a kind of 458 telecommunication circuit according to claim 1, it is characterised in that：458 communication chip is one with wink
The difference transceiver that state voltage suppresses.
3. a kind of 458 telecommunication circuit according to claim 1, it is characterised in that：The TVS pipe model P4SMA6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098817.0A CN106899322A (en) | 2017-02-23 | 2017-02-23 | A kind of 458 telecommunication circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098817.0A CN106899322A (en) | 2017-02-23 | 2017-02-23 | A kind of 458 telecommunication circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106899322A true CN106899322A (en) | 2017-06-27 |
Family
ID=59185719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710098817.0A Pending CN106899322A (en) | 2017-02-23 | 2017-02-23 | A kind of 458 telecommunication circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106899322A (en) |
-
2017
- 2017-02-23 CN CN201710098817.0A patent/CN106899322A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170627 |
|
| WD01 | Invention patent application deemed withdrawn after publication |