CN101753488A - Non-polarity 485 communication technology - Google Patents
Non-polarity 485 communication technology Download PDFInfo
- Publication number
- CN101753488A CN101753488A CN200810217735A CN200810217735A CN101753488A CN 101753488 A CN101753488 A CN 101753488A CN 200810217735 A CN200810217735 A CN 200810217735A CN 200810217735 A CN200810217735 A CN 200810217735A CN 101753488 A CN101753488 A CN 101753488A
- Authority
- CN
- China
- Prior art keywords
- line
- communication
- pin
- polarity
- communication line
- 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.)
- Pending
Links
Landscapes
- Dc Digital Transmission (AREA)
Abstract
The invention relates to a non-polarity 485 communication technology, in particular to a cabled communication technology. Pins A and B of a 458 chip are serially connected with a polarity conversion switch and then is connected with a communication circuit. When the voltage Vab between the wires A and B of the communication circuit is more than 200 mv or the Vba is more than 200 MV and lasts for a given time, the polarity conversion switch is controlled to act, so the pins A and B of the 485 chip are connected with the wire AB or the wire BA of the communication circuit. The error wire connection problem of the 485 communication circuit can be eliminated. The non-polarity 485 communication technology is applicable to all 485 communication fields.
Description
Affiliated technical field
The invention belongs to the cable communicating technology category, relate to 485 communication technologys.
Background technology
485 communication technologys are used very extensive, its communication line divides A, B two kinds of polarity, its wiring rules: two communicate by letter pin A and B of 485 chips, couple together by two communication line A lines and B line, the connection that the A line of the A pin of all 485 chips, B pin and communication line, B line must be consistent: the A pin connects the A line, the B pin connects the B line, and to keep voltage Vab＞200mv between A line and B line, otherwise, whole or part line traffic paralysis.
Summary of the invention
Purpose of the present invention: a kind of 485 communication technologys that need not to distinguish polarity are provided.
Technical scheme provided by the present invention is: give A pin, polarity reversing switch of B pin serial connection of 485 chips, be connected on the communication line.Voltage Vab＞200mv when between 485 communication line A lines, B line, and duration when surpassing certain hour, polarity reversing switch makes the A pin of 485 chips connect the A line of communication line, and the B pin connects the B line of communication line.Voltage Vba＞200mv when between 485 communication line A lines, B line, and duration when surpassing certain hour, polarity reversing switch makes the A pin of 485 chips connect the B line of communication line, and the B pin connects the A line of communication line.
Beneficial effect of the present invention: current 485 communication connection need be distinguished A line and B line, and assembling is produced and brought inconvenience to practical large-scale, have also increased many artificial site operation accidents.The present invention will eliminate 485 communication line wiring error problems, and it is simpler, reliable that 485 communication equipments are installed, and use of large-scale production is more convenient.
Embodiment
Give A pin, single-pole double throw simulant electronic switch of B pin serial connection of 485 chips, be connected on the communication line.Use the voltage on the comparator detection communication line, when the voltage Vab between communication line A line, B line＞200mv, start 1 second integrating circuit, Vab continues 1 second＞200mv, integrating circuit output high level drives the single-pole double throw simulant electronic switch, make the A line of the A pin connection communication line of 485 chips, the B pin connects the B line of communication line.Otherwise, when the voltage Vba between communication line A line, B line＞200mv, start 1 second integrating circuit, Vba continues 1 second＞200mv, the integrating circuit output low level drives the single-pole double throw simulant electronic switch, makes the B line of the A pin connection communication line of 485 chips, and the B pin connects the A line of communication line.
Claims (3)
1. nonpolarity 485 communication technologys is characterized in that: give A pin, polarity reversing switch of B pin serial connection of 485 chips, be connected on the communication line.
2. according to claim 1 described nonpolarity 485 communication technologys, its further feature is: the voltage Vab＞200mv when between 485 communication line A lines, B line, and the duration is when surpassing certain hour, polarity reversing switch makes the A pin of 485 chips connect the A line of communication line, and the B pin connects the B line of communication line.
3. according to claim 1 described nonpolarity 485 communication technologys, its further feature is: the voltage Vba＞200mv when between 485 communication line A lines, B line, and the duration is when surpassing certain hour, polarity reversing switch makes the A pin of 485 chips connect the B line of communication line, and the B pin connects the A line of communication line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217735A CN101753488A (en) | 2008-12-02 | 2008-12-02 | Non-polarity 485 communication technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217735A CN101753488A (en) | 2008-12-02 | 2008-12-02 | Non-polarity 485 communication technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101753488A true CN101753488A (en) | 2010-06-23 |
Family
ID=42479907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810217735A Pending CN101753488A (en) | 2008-12-02 | 2008-12-02 | Non-polarity 485 communication technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101753488A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011057538A1 (en) * | 2009-11-12 | 2011-05-19 | Liu Aimin | Non-polarity 485 chip |
-
2008
- 2008-12-02 CN CN200810217735A patent/CN101753488A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011057538A1 (en) * | 2009-11-12 | 2011-05-19 | Liu Aimin | Non-polarity 485 chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8818530B2 (en) | LED light controller system and method | |
| CN106649177A (en) | Device for automatic identification and switching of port of universal serial interface and working method thereof | |
| CN105137114B (en) | A kind of vehicle speed sensor and negative voltage Anti-jamming Communication system | |
| CN204154882U (en) | The sampling of a kind of power supply noble potential fault and holding circuit | |
| CN101753488A (en) | Non-polarity 485 communication technology | |
| CN202565020U (en) | Failure detecting circuit of automatic change-over switch | |
| CN102820789B (en) | Alternating-current zero line and firing line identification and conversion circuit | |
| CN214540463U (en) | Relay board for switching and detecting multiple paths of signals | |
| WO2011057538A1 (en) | Non-polarity 485 chip | |
| CN207817457U (en) | A kind of multifunctional fuel battery testing platform controller | |
| CN201311699Y (en) | Alarming probe line failure prompt device | |
| CN108304339A (en) | A kind of serial expanded circuit and its working method of dynamic managing and control system | |
| CN101702407A (en) | Non-polarity 485 chip | |
| CN203691706U (en) | Two pin RGB-LED control circuit | |
| CN203054078U (en) | Nonpolar 485 communication circuit suitable for electric energy meter | |
| CN206155619U (en) | Trailer bed recognition device based on 1 wire | |
| CN207503441U (en) | MBUS buses send signaling conversion circuit | |
| CN208986864U (en) | One kind preventing brush motor common conduct circuit | |
| CN207397258U (en) | A kind of test nine kinds of needles turns SFP interface circuits | |
| CN202583796U (en) | Hot-pluggable multichannel analogue output module | |
| CN206490659U (en) | multi-channel analog signal switching circuit | |
| CN205792231U (en) | A kind of driving power supply | |
| CN110376421A (en) | A kind of detection circuit of analog input signal | |
| CN202818119U (en) | Circuit for identifying and converting AC zero and live wire | |
| CN101997236A (en) | Non-polarity 485 chip design scheme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Aimin Document name: Notification that Application Deemed to be Withdrawn |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100623 |