CN104881392A - Multiplexing RS485 circuit - Google Patents
Multiplexing RS485 circuit Download PDFInfo
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- CN104881392A CN104881392A CN201510342818.6A CN201510342818A CN104881392A CN 104881392 A CN104881392 A CN 104881392A CN 201510342818 A CN201510342818 A CN 201510342818A CN 104881392 A CN104881392 A CN 104881392A
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- circuit
- pin
- shift register
- register group
- controller
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4204—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0004—Parallel ports, e.g. centronics
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Communication Control (AREA)
- Small-Scale Networks (AREA)
Abstract
The invention discloses a multiplexing RS485 circuit. The multiplexing RS485 circuit comprises a controller, a serial-in parallel-out shifting register group and an RS485 circuit; the controller is provided with a UART interface and three I/O ports; the I/O ports are connected with the input end of the serial-in parallel-out shifting register group, respectively; the output end of the serial-in parallel-out shifting register group is connected with more than two RS485 circuits, respectively, and enables each RS485 circuit; the RXD pin and the TXD pin of the UART interface of the controller are correspondingly connected with RO pin and the DI pin of an RS485 communication circuit, respectively. The multiplexing RS485 circuit has high efficiency, high systematicness and higher practical value, and is especially suitable for application in the DMX512 communication protocol.
Description
Technical field
The present invention relates to circuit engineering field, particularly relate to a kind of multiplexed RS485 circuit.
Background technology
The present invention comes from RS485 Control and Application, has two parts in the circuit, two parts circuit be respectively minimum system circuit you, be called for short: MCU; Some is telecommunication circuit, is called for short: RS485.How to solve MCU when only having the UART Universal Asynchronous Receiver Transmitter interface of 1 and multiple common I/O port, hardware handles is passed through with 1 UART Universal Asynchronous Receiver Transmitter interface and common I/O port and multiple RS485, can be made with selective communication, Ru Yilu, multichannel, all (in circuit) RS485 communicate.
This circuit has only used 1 UART Universal Asynchronous Receiver Transmitter interface to communicate with the RS485 of multichannel (more than 1 tunnel) in other circuit present unlike this circuit, having MCU to come can to any road in multichannel or multichannel and whole RS485 circuit controls and the transmission of information, and be all employing 1 UART Universal Asynchronous Receiver Transmitter Interface Controller 1 RS485 circuit in circuit in the past, or adopt special MCU to control the RS485 circuit of multichannel, so improve the cost of circuit; Now have employed new control mode and decrease demand to UART Universal Asynchronous Receiver Transmitter interface quantity.
A prior art [1], sees " between a kind of elevator outer-office calling plate and master control board synchronous communication device " (Shanghai: CN2815986,2006-09-13, author Jiang Zhijun, Wu Zuojin, Liu Ming).As shown in Figure 1, it is characterized in that in this communication device: 1 UART Universal Asynchronous Receiver Transmitter interface of MCU drives separately 1 RS485 circuit to receive and sends data thus control the transmitting-receiving of multiple RS485 circuit.In prior art [1], this bus multiplex communication mode efficiency comparison is low, needs repeatedly to return answer signal, and the time causing transmission data used is longer, thus the ageing of whole system lowers greatly.
A prior art [2], sees " Multipath general purpose asynchronous transceiver " (Sichuan: CN2645348,2004-09-29, author Yang Shouping).As shown in Figure 2, it is characterized in that in this kind of DLT asynchronous communication: expand two or more UART Universal Asynchronous Receiver Transmitter by a UART Universal Asynchronous Receiver Transmitter, and expansion UART Universal Asynchronous Receiver Transmitter baud rate out can be arranged by software or control line.In prior art [2], large to the dependence of universal asynchronous serial interface, internal circuit is complicated, and does not make full use of processor resource.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, providing a kind of can carry out to the signal of Control Console the lighting system that forward process realizes multidiameter delay control.
The technical solution used in the present invention is:
A kind of multiplexed RS485 circuit, it comprises controller, SI PO shift register group and RS485 circuit, described controller has a UART interface and three I/O mouths, three described I/O mouths connect the input end of SI PO shift register group respectively, the output terminal of described SI PO shift register group connects the RS485 circuit of more than two-way respectively, and the RS485 circuit controlling each road is enable; The RXD pin of the UART interface of described controller and TXD pin are respectively with the RO pin of RS485 telecommunication circuit with DI pin is corresponding is connected.
Described SI PO shift register group comprises the SI PO shift register of two or more cascade; The nRE pin of each road RS485 circuit is connected with a delivery outlet of SI PO shift register respectively with DE pin, and described controller is by SI PO shift register each road enable RS485 circuit.
Described controller is arm processor.
The present invention adopts above technical scheme, under the state not using special IC, by the UART interface of controller be connected at controller by three I/O mouths realize the control to RS485 circuit more than two-way by the SI PO shift register group that controls.It is strong that the present invention controls dirigibility, when not needing software programming, and can the circuit sending signal of any road wherein, multichannel or whole RS485 separately simultaneously; Also the signal that each RS485 circuit returns can be received at times.The present invention also reduces the dependence to special chip, reduces the cost of development of product and the production cost of product.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details;
The theory diagram of Fig. 1 prior art [1];
The theory diagram of Fig. 2 prior art [2];
The system chart of a kind of multiplexed RS485 circuit of Fig. 3 the present invention.
Embodiment
As shown in Figure 3, the present invention it comprise controller, SI PO shift register group and RS485 circuit, described controller has a UART interface and three I/O mouths, three described I/O mouths connect the input end of SI PO shift register group respectively, the output terminal of described SI PO shift register group connects the RS485 circuit of more than two-way respectively, and the RS485 circuit controlling each road is enable; The RXD pin of the UART interface of described controller and TXD pin are respectively with the RO pin of RS485 telecommunication circuit with DI pin is corresponding is connected.
Described SI PO shift register group comprises the SI PO shift register of two or more cascade; The nRE pin of each road RS485 circuit is connected with a delivery outlet of SI PO shift register respectively with DE pin, and described controller is by SI PO shift register each road enable RS485 circuit.
Described controller is arm processor.
The present invention adopts above technical scheme, under the state not using special IC, by the UART interface of controller be connected at controller by three I/O mouths realize the control to RS485 circuit more than two-way by the SI PO shift register group that controls.It is strong that the present invention controls dirigibility, when not needing software programming, and can the circuit sending signal of any road wherein, multichannel or whole RS485 separately simultaneously; Also the signal that each RS485 circuit returns can be received at times.The present invention also reduces the dependence to special chip, reduces the cost of development of product and the production cost of product.
In sum, a kind of multiplexed RS485 circuit set forth in the present invention, has high efficiency, systematicness and higher practical value, is particularly suitable for the application in DMX512 communication protocol.
Claims (3)
1. a multiplexed RS485 circuit, it is characterized in that: it comprises controller, SI PO shift register group and RS485 circuit, described controller has a UART interface and three I/O mouths, three described I/O mouths connect the input end of SI PO shift register group respectively, the output terminal of described SI PO shift register group connects the RS485 circuit of more than two-way respectively, and the RS485 circuit controlling each road is enable; The RXD pin of the UART interface of described controller and TXD pin are respectively with the RO pin of RS485 telecommunication circuit with DI pin is corresponding is connected.
2. a kind of multiplexed RS485 circuit according to claim 1, is characterized in that: described SI PO shift register group comprises the SI PO shift register of two or more cascade; The nRE pin of each road RS485 circuit is connected with a delivery outlet of SI PO shift register respectively with DE pin, and described controller is by SI PO shift register each road enable RS485 circuit.
3. a kind of multiplexed RS485 circuit according to claim 1, is characterized in that: described controller is arm processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342818.6A CN104881392B (en) | 2015-06-19 | 2015-06-19 | A kind of RS485 circuits of multiplexing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342818.6A CN104881392B (en) | 2015-06-19 | 2015-06-19 | A kind of RS485 circuits of multiplexing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104881392A true CN104881392A (en) | 2015-09-02 |
| CN104881392B CN104881392B (en) | 2018-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510342818.6A Active CN104881392B (en) | 2015-06-19 | 2015-06-19 | A kind of RS485 circuits of multiplexing |
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| Country | Link |
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| CN (1) | CN104881392B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107396505A (en) * | 2017-09-20 | 2017-11-24 | 上海乐野网络科技有限公司 | A kind of circuit for driving multigroup LED to show |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020184543A1 (en) * | 2001-05-31 | 2002-12-05 | Philips Semiconductor, Inc. | Power and frequency adjustable UART device |
| CN101404839A (en) * | 2008-05-16 | 2009-04-08 | 上海大峡谷光电科技有限公司 | Enhancement type DMX512 light control system added with auxiliary collocation channel |
| CN204117139U (en) * | 2014-09-04 | 2015-01-21 | 特变电工西安电气科技有限公司 | The directional control circuit of a kind of RS485 |
-
2015
- 2015-06-19 CN CN201510342818.6A patent/CN104881392B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020184543A1 (en) * | 2001-05-31 | 2002-12-05 | Philips Semiconductor, Inc. | Power and frequency adjustable UART device |
| CN101404839A (en) * | 2008-05-16 | 2009-04-08 | 上海大峡谷光电科技有限公司 | Enhancement type DMX512 light control system added with auxiliary collocation channel |
| CN204117139U (en) * | 2014-09-04 | 2015-01-21 | 特变电工西安电气科技有限公司 | The directional control circuit of a kind of RS485 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107396505A (en) * | 2017-09-20 | 2017-11-24 | 上海乐野网络科技有限公司 | A kind of circuit for driving multigroup LED to show |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104881392B (en) | 2018-10-16 |
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