CN205318153U - Intermediate handing circuit of RS485 signal bus hang -up - Google Patents
Intermediate handing circuit of RS485 signal bus hang -up Download PDFInfo
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- CN205318153U CN205318153U CN201521054386.0U CN201521054386U CN205318153U CN 205318153 U CN205318153 U CN 205318153U CN 201521054386 U CN201521054386 U CN 201521054386U CN 205318153 U CN205318153 U CN 205318153U
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Abstract
The utility model relates to an intermediate handing circuit of RS485 signal bus hang -up, the treatment circuit includes that n sends main control unit 485, 485 simulation change over switch, and each way of main control unit's interface is divided equally and is do not connected respective reception control unit 485, and each way is received main control unit 485 and is corresponded and connect respective start -up time delay module, and each way is received main control unit 485 and is connected 485 simulation change over switch simultaneously, and this 485 simulation change over switch is through being connected by the controller in output RS485 and the bus. The utility model discloses become the TTL signal to original RS485 signal, the MCU's of being convenient for like this discernment. Become the RS485 signal to the TTL signal afterwards, receive only one letter enabling signal of MCU, hou mian signal is no longer received, and whether MCU only pays close attention to the back interrupt signal that other passageways come in and determines and switch.
Description
Technical field
The utility model belongs to electronic applications, it relates to the process of RS485 signal bus, the intermediate treatment circuit of especially a kind of RS485 signal bus suspension.
Background technology
Several operating devices are connected to a receiving equipment or multiple receiving equipment, certain main control equipment is sent completely and can not discharge bus, and other equipment can not obtain the control of bus, at this moment other equipment just can not send signal, at this moment bus will be in the state of a kind of paralysis, it is easy to does not also discharge the phenomenon of bus when occurring that certain principal controller does not send data. Because any one sends does not discharge bus, being also exactly enable pin when being in high level of 485, the bus of 485 can be held always, and other principal controller can not obtain the control of bus.
By the retrieval of patent document, not yet find the patent document relevant to the utility model application.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, the intermediate treatment circuit of a kind of RS485 signal bus suspension is provided, this circuit is arranged on principal controller and by between controller, realize which master control equipment have signal just forcibly signal switching to, in this road, ensureing have the principal controller of signal to obtain control.
The purpose of this utility model is achieved through the following technical solutions:
The intermediate treatment circuit of a kind of RS485 signal bus suspension, it is arranged on the interface being connected with principal controller, between the o controller being connected with by controller, it is characterized in that: described process circuit comprises n transmission principal controller 485, 485 analog switch, the each road of the interface of principal controller connects respective reception controller 485 respectively, each road receives principal controller 485 correspondence and connects respective start-up study module, the principal controller 485 of each road reception simultaneously connects 485 analog switch, this 485 analog switch is by exporting RS485 and being connected by controller in bus.
And, described reception principal controller 485 and o controller 485 all adopt MAX485, and start-up study module adopts 74HC123,485 analog switch to adopt CD4052.
Advantage of the present utility model and positively effect be:
1, the intermediate treatment circuit that the utility model is introduced, which has signal to make in switching over Dao Na mono-tunnel can to make main control equipment, the operating device on this road and receiving equipment is made to carry out normally communicating, to avoid a road wherein to hold bus, and in the situation that oneself other main control equipment of obstructed courier can not communicate, and generally there is not the problem of bus collision in such mode of connection.
2, the utility model becomes original RS485 signal into TTL signal, is convenient to the identification of MCU like this. Finally again TTL signal being turned into RS485 signal, MCU receives only a letter initiating signal, and signal below no longer receives, and only pays close attention to the look-at-me that other passage comes in and judge whether switching after MCU.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is schematic circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described; The present embodiment is descriptive, is not limited, can not thus limit protection domain of the present utility model.
The intermediate treatment circuit of a kind of RS485 signal bus suspension, between the o controller be arranged on the interface being connected with principal controller, being connected with by controller, comprising n reception principal controller 485, n start-up study module and 485 analog switch, the present embodiment accompanying drawing carries out describing for four principal controllers. The each road of the interface of principal controller connects respective reception principal controller 485 respectively, each road receives principal controller 485 correspondence and connects respective start-up study module, the principal controller 485 of each road reception simultaneously connects 485 analog switch, and this 485 analog switch is connected with by controller by o controller.
Described reception principal controller 485 and o controller 485 all adopt MAX485, and start-up study module adopts 74HC123,485 analog switch to adopt CD4052.
Principle of work of the present utility model is:
485 signals on each road are converted to TTL signal through respective corresponding reception principal controller 485, start-up study module simultaneously, MCU sends 485 analog switch (CD4052) to simultaneously, and MCU receives initiating signal according to different external interrupt and controls to start analog switch. Form RS485 signal again through 485 output signals like this, just define a complete passage, the limitation no longer pinned by bus.
At each road principal controller 485 as corresponding 485 elder generations received under Signal reception, according to the feature------lower level transmitting data start bit, correspondence is received in start-up study module 74HC123, make the interrupt pin of MCU receive start bit and switch passage corresponding to 485 analog switch (CD4052) as the look-at-me identification of MCU (74HC123 mainly start bit signal time delay is convenient to) according to the different signal input of interrupting of correspondence, by o controller 485 (MAX485), signal is sent again, effectively the Resolving probiems of a certain principal controller pulling bus can be fallen by such a kind of conversion.
Realisation. This scheme has been applied on the equipment of reality, for the equipment connection of compatible different manufacturers creates real application to consolidated network.
Claims (2)
1. the intermediate treatment circuit of a RS485 signal bus suspension, it is arranged on the interface being connected with principal controller, between the o controller being connected with by controller, it is characterized in that: described process circuit comprises n transmission principal controller 485, 485 analog switch, the each road of the interface of principal controller connects respective reception controller 485 respectively, each road receives principal controller 485 correspondence and connects respective start-up study module, the principal controller 485 of each road reception simultaneously connects 485 analog switch, this 485 analog switch is by exporting RS485 and being connected by controller in bus.
2. the intermediate treatment circuit of RS485 signal bus suspension according to claim 1, it is characterized in that: described reception principal controller 485 and o controller 485 all adopt MAX485, start-up study module adopts 74HC123,485 analog switch to adopt CD4052.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521054386.0U CN205318153U (en) | 2015-12-15 | 2015-12-15 | Intermediate handing circuit of RS485 signal bus hang -up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521054386.0U CN205318153U (en) | 2015-12-15 | 2015-12-15 | Intermediate handing circuit of RS485 signal bus hang -up |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205318153U true CN205318153U (en) | 2016-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521054386.0U Active CN205318153U (en) | 2015-12-15 | 2015-12-15 | Intermediate handing circuit of RS485 signal bus hang -up |
Country Status (1)
| Country | Link |
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| CN (1) | CN205318153U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109800201A (en) * | 2018-12-18 | 2019-05-24 | 珠海派诺科技股份有限公司 | The driving method of RS485 real-time tranception control based on linux |
| CN113377698A (en) * | 2021-06-30 | 2021-09-10 | 四川湖山电器股份有限公司 | Novel RS-485 physical interface |
-
2015
- 2015-12-15 CN CN201521054386.0U patent/CN205318153U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109800201A (en) * | 2018-12-18 | 2019-05-24 | 珠海派诺科技股份有限公司 | The driving method of RS485 real-time tranception control based on linux |
| CN109800201B (en) * | 2018-12-18 | 2021-04-13 | 珠海派诺科技股份有限公司 | Driving method for RS485 real-time receiving and transmitting control based on linux |
| CN113377698A (en) * | 2021-06-30 | 2021-09-10 | 四川湖山电器股份有限公司 | Novel RS-485 physical interface |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |