CN201060545Y - Half-duplex communication transmitting-receiving controller - Google Patents
Half-duplex communication transmitting-receiving controller Download PDFInfo
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- CN201060545Y CN201060545Y CNU2007200912652U CN200720091265U CN201060545Y CN 201060545 Y CN201060545 Y CN 201060545Y CN U2007200912652 U CNU2007200912652 U CN U2007200912652U CN 200720091265 U CN200720091265 U CN 200720091265U CN 201060545 Y CN201060545 Y CN 201060545Y
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Abstract
The utility model relates to a semiduplex communication transceiver which consists of a power supply module, a CPU and a communication module; wherein, the communication interfaces of the CPU and the communication module are connected in series; the room between the CPU and the communication module is provided with a transceiver circuit; the control input interfaces COM_CONT1 and COM_CONT2 are connected with the control I/O output of the CPU; the output control interface CONT_OUT is connected with the receiving/transmitting control interface of the communication module. The semiduplex communication transceiver of the utility model has the advantages of reasonable circuit design, low cost, simplicity and practicability, and can be embedded in the circuitry of any semiduplex communication equipment to support the reliable and steady operation of a semiduplex communication bus, so as to improve the stability of the network and reduce the cost of debugging and maintenance. The utility model provides an effective cheap solution for the reliable and effective application of the semiduplex communication bus, and has the value of being widely applied.
Description
(1) technical field:
The utility model relates to a kind of half duplex communication receiving/transmission control device.
(2) background technology:
Current various fieldbus application is chargeed as central air conditioner, fire protection warning, and applications such as central three meter transcribing generally adopt semiduplex fieldbus, as fieldbus such as employing RS485 buses.Half-duplex bus has characteristics and requirement, and synchronization can only have an equipment to send data to bus, and therefore, bus apparatus must be in accepting state when not responding the host communication order arbitrarily, could ensure the no conflict of bus and the reliability of communication.Because on-the-spot complicated situation, in bus construction at the scene, debugging and the later stage use, to cause network paralysis be to perplex technological development and field maintemance staff's problem always because of taking for a long time bus to occur, be in transmit status as long as there is a node to hinder for some reason in the unit networks, bus will take for a long time, causes the half pair of merit communication network paralysis in this unit.Need consume a large amount of human and material resources and time and in debugging and maintenance, search malfunctioning node.Can not take bus if the trouble spot is in accepting state, also can not influence whole network, the workload of at this moment investigating malfunctioning node will reduce significantly, and the staff can directly fix a point to check at malfunctioning node.
At the problems referred to above, former technical way commonly used is to add protection in the communication of equipment, for example selects high-level communication chip for use, adds photoelectricity and isolates, and adds anti-thunder tube or the like measure.But such situation often appears in actual applications: because the half duplex communication bus is relatively stricter to the transmitting-receiving control requirement of slave, adopt single high-low level transmitting-receiving control circuit, when node procedure deadlock or hardware fault occur and exports single level always, transmitting-receiving control pin control signal change with the output of CPU control pin high level or low level, the communication that influences bus in case the level of output control communication module is in that transmit status will take bus for a long time.Because the deadlock of system equipment makes transmitting-receiving control be in random state, bus is disturbed always or at interval tends to cause network paralysis, causes the probability of network paralysis also quite big.Therefore, even take above-mentioned measure still to have very big communication security hidden danger.
(3) utility model content:
The utility model is at the problem that prior art exists, and it is lower to design and manufacture a kind of cost, has the half duplex communication receiving/transmission control device of high noise immunity.
The technical solution adopted in the utility model:
A kind of half duplex communication receiving/transmission control device, contain promising its power module of working power is provided, central processing unit and communication module, the serial communication interface of communication module and central processing unit is corresponding to be connected, between central processing unit and communication module, be connected with the transmitting-receiving control circuit, control input interface COM_CONT1, the COM_CONT2 of described transmitting-receiving control circuit connects the control I/O output interface of central processing unit, and the output control interface CONT_OUT of transmitting-receiving control circuit connects the reception/transmission control interface of communication module.The transmitting-receiving control circuit is just carried out according to the unique particular level of control I/O output interface output of central processing unit and is sent control, when promptly having only the control I/O of central processing unit to export unique reverse level simultaneously, communication module just is in transmit status, other level state transmitting-receiving control module all is in accepting state, guarantees that to greatest extent bus can cause can't communication for faulty equipment takies for a long time.
Described half duplex communication receiving/transmission control device, the transmitting-receiving control circuit adopts photoelectric isolating circuit, communication module adopts the RS485 communicating circuit, two of photoelectrical coupler corresponding respectively two or two groups of control I/O output interfaces that connect central processing unit of input end in the photoelectric isolating circuit, the output terminal CONT_OUT of photoelectrical coupler connects the reception/transmission control interface of integrated circuit (IC) chip MAX487 in the RS485 communicating circuit
Described half duplex communication receiving/transmission control device, the transmitting-receiving control circuit adopts the transistor control circuit, two corresponding respectively two or two groups of control I/O output interfaces that connect central processing unit of its control base stage of the transistor that is of coupled connections, the collector of NPN transistor connects power supply, and the collector output CONT_OUT of PNP transistor connects reception/transmission control interface of communication module integrated circuit (IC) chip MAX487.
Described half duplex communication receiving/transmission control device, the transmitting-receiving control circuit adopts integrated operational amplifier and AND, adopt two operational amplifier LM358 to constitute two comparers, the in-phase input end of one of them comparer and corresponding respectively two or the two groups of control I/O output interfaces that are connected central processing unit of the inverting input of another comparer, the output terminal of two comparers inserts two input ends of an AND 74HCO8 respectively, and the output terminal CONT_OUT of AND connects reception/transmission control interface of communication module integrated circuit (IC) chip MAX487.
Described half duplex communication receiving/transmission control device, not only effective to the MAX487 communication module, effective equally to other products such as MAX485, SP485, composition modules such as SP487, SN75176, applicable to the transmitting-receiving control of all half duplex communication buses.
Positive beneficial effect of the present utility model:
1, the utility model half duplex communication receiving/transmission control device, reliable and stable operation to the half duplex communication bus provides effective support, in the practical application of half duplex communication bus, can improve stability of network greatly at the scene, significantly the cost that reduces debugging and safeguard.The utility model transmitting-receiving control circuit can be embedded in the circuit of any half duplex communication equipment, realizes identical effect, an effective cheap solution that provides in the reliable and effective application of others for the half duplex communication bus.
2, the utility model half duplex communication receiving/transmission control device, circuit design is reasonable, and is simple and practical, and cost is low, uses easy to maintenancely, can realize reliable half duplex communication, has fabulous application value.
(4), description of drawings
Fig. 1: half duplex communication receiving/transmission control device synoptic diagram
Fig. 2: one of half duplex communication receiving/transmission control device transmitting-receiving control circuit
Fig. 3: two of half duplex communication receiving/transmission control device transmitting-receiving control circuit
Fig. 4: three of half duplex communication receiving/transmission control device transmitting-receiving control circuit
Fig. 5: half duplex communication receiving/transmission control device cpu control circuit
Fig. 6: communication of half duplex communication receiving/transmission control device and power circuit
(5), embodiment:
Embodiment one: referring to Fig. 1, the utility model half duplex communication receiving/transmission control device, contain power module and provide working power for it, the serial communication interface of communication module and central processing unit is corresponding to be connected, between central processing unit and communication module, be connected with the transmitting-receiving control circuit, control input interface COM_CONT1, the COM_CONT2 of described transmitting-receiving control circuit connects the control I/O output interface of central processing unit, and the output control interface CONT_OUT of transmitting-receiving control circuit connects the reception/transmission control interface of communication module.The transmitting-receiving control circuit is carried out corresponding sending and receiving conversion and control according to the specific level signal of the control I/O output interface output of central processing unit.
The present embodiment embodiment is referring to Fig. 2, Fig. 5, Fig. 6, the transmitting-receiving control circuit adopts photoelectric isolating circuit, communication module adopts the RS485 communicating circuit, central processor CPU adopts 89S52, two of photoelectrical coupler corresponding respectively P that connect central processing unit of input end COM_CONT1, COM_CONT2 in the photoelectric isolating circuit
1.0And P
2.0Interface, the output terminal CONT_OUT of photoelectrical coupler connects the reception/transmission control interface of integrated circuit (IC) chip MAX487 in the RS485 communicating circuit.
J11 is power supply input and communication interface among Fig. 6, and power interface provides power supply to entire circuit.U11 is CPU among the figure, and U1 is a photoelectrical coupler, and U12 is a communication RS485 bus communication master chip.The CPU of device can control the reception and the transmission of communication by the transmitting-receiving control circuit.In this embodiment, having only the CPU operate as normal and making COM_CONT1 is high, COM_CONT2 when low, and CONT_OUT is output as height, and communicating circuit sends data to external bus.CONT_OUT is output as low, the communicating circuit accepting state.For example chip has been broken, and all of the port is high or low entirely, and this moment, CONT_OUT was output as lowly, and node device is in accepting state, can not disturb external bus.Adopt this scheme of photoelectric isolating circuit effectively the most succinct.
Embodiment two: referring to Fig. 1, Fig. 3, Fig. 5, Fig. 6, present embodiment transmitting-receiving control circuit adopts the transistor control circuit, two corresponding respectively two or two groups of control I/O output interfaces that connect central processing unit of its control base stage of the transistor that is of coupled connections, the collector of NPN transistor connects power supply, and the collector output CONT_OUT of PNP transistor connects reception/transmission control interface of communication module integrated circuit (IC) chip MAX487.U11 is CPU among the figure, and TR1 and TR2 are triode 9013,9012, and U12 is a communication RS485 bus communication master chip, and J11 is a power input interface.
The difference of present embodiment and embodiment one is to receive and dispatch control circuit and changes triode control into, and principle is identical with embodiment one with function in such cases, no longer repeats.Here the operate in saturation district of the triode of Li Yonging, characteristics reach the function that needs according to this.
Embodiment three: referring to Fig. 1, Fig. 4, Fig. 5, Fig. 6, present embodiment half duplex communication receiving/transmission control device, the transmitting-receiving control circuit adopts integrated operational amplifier and AND, adopt two operational amplifier LM358 to constitute two comparers, the in-phase input end of one of them comparer and corresponding respectively two or the two groups of control I/O output interfaces that are connected central processing unit of the inverting input of another comparer, the output terminal of two comparers inserts two input ends of an AND 74HC08 respectively, and the output terminal CONT_OUT of AND connects the driving input reception/transmission control interface of communication module integrated circuit (IC) chip MAX487.U11 is CPU among the figure, and U12 is a communication RS485 bus communication master chip, and J11 is a power input interface.The difference of present embodiment and embodiment one is to receive and dispatch control circuit and changes operational amplifier and AND control into.Principle is identical with embodiment one with function in such cases, is not repeating.Here the exemplary functions of the operational amplifier of Li Yonging constitutes two comparers, and an AND processing signals of end can reach the function that needs by this circuit.
Embodiment four: referring to Fig. 1, Fig. 2, Fig. 5, Fig. 6, and present embodiment half duplex communication receiving/transmission control device, slightly different with embodiment one: promptly by one group of port P of central processor CPU
1.0～P
1.7The common input end COM_CONT1 that connects photoelectrical coupler; The port P of central processor CPU
2.0Another input end COM_CONT2 that connects photoelectrical coupler.In this embodiment, has only CPU operate as normal and make and be P
1.0～P
1.7High, P
2.0When low, CONT OUT is output as height, and communicating circuit sends data to external bus.Other situation CONT_OUT is output as low, the communicating circuit accepting state.For example chip has been broken, and all of the port is high or low entirely, and this moment, CONT_OUT was output as lowly, did not disturb external bus.
In the specific implementation process, in conjunction with Fig. 1, can be Fig. 2, any one in 3,4 or the combination of several transmitting-receiving control circuits are embedded in the communication control circuit of other products, to reach identical functions, improve the reliability of half duplex communication bus.
Claims (5)
1. half duplex communication receiving/transmission control device, contain power module, central processing unit and communication module, the serial communication interface of communication module and central processing unit is corresponding to be connected, it is characterized in that: between central processing unit and communication module, be connected with the transmitting-receiving control circuit, control input interface COM_CONT1, the COM_CONT2 of described transmitting-receiving control circuit connects the control I/O output interface of central processing unit, and the output control interface CONT_OUT of transmitting-receiving control circuit connects the reception/transmission control interface of communication module.
2. half duplex communication receiving/transmission control device according to claim 1, it is characterized in that: described transmitting-receiving control circuit adopts photoelectric isolating circuit, communication module adopts the RS485 communicating circuit, two of photoelectrical coupler corresponding respectively two or two groups of control I/O output interfaces that connect central processing unit of input end in the photoelectric isolating circuit, the output terminal CONT_OUT of photoelectrical coupler connects the reception/transmission control interface of integrated circuit (IC) chip MAX487 in the RS485 communicating circuit.
3. half duplex communication receiving/transmission control device according to claim 1, it is characterized in that: described transmitting-receiving control circuit adopts the transistor control circuit, two corresponding respectively two or two groups of control I/O output interfaces that connect central processing unit of its control base stage of the transistor that is of coupled connections, the collector of NPN transistor connects power supply, and the collector output CONT_OUT of PNP transistor connects reception/transmission control interface of communication module integrated circuit (IC) chip MAX487.
4. half duplex communication receiving/transmission control device according to claim 1, it is characterized in that: described transmitting-receiving control circuit adopts integrated operational amplifier and AND, adopt two operational amplifier LM358 to constitute two comparers, the in-phase input end of one of them comparer and corresponding respectively two or the two groups of control I/O output interfaces that are connected central processing unit of the inverting input of another comparer, the output terminal of two comparers inserts two input ends of an AND 74HC08 respectively, and the output terminal CONT_OUT of AND connects reception/transmission control interface of communication module integrated circuit (IC) chip MAX487
5. according to claim 2,3 or 4 described half duplex communication receiving/transmission control device, it is characterized in that: integrated circuit (IC) chip or adopt among MAX485, SP485, SP487, the SN75176 any one in the communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200912652U CN201060545Y (en) | 2007-07-30 | 2007-07-30 | Half-duplex communication transmitting-receiving controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200912652U CN201060545Y (en) | 2007-07-30 | 2007-07-30 | Half-duplex communication transmitting-receiving controller |
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| Publication Number | Publication Date |
|---|---|
| CN201060545Y true CN201060545Y (en) | 2008-05-14 |
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ID=39409029
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200912652U Expired - Fee Related CN201060545Y (en) | 2007-07-30 | 2007-07-30 | Half-duplex communication transmitting-receiving controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188488B (en) * | 2007-07-30 | 2011-08-17 | 郑州春泉暖通节能设备有限公司 | Control method and device for half duplex communication receiving/transmission |
| CN109599843A (en) * | 2019-01-09 | 2019-04-09 | 深圳市德兰明海科技有限公司 | A kind of current foldback circuit and inverter of light-coupled isolation |
| CN112460748A (en) * | 2020-11-23 | 2021-03-09 | 珠海格力电器股份有限公司 | Communication device and method for internal and external machines and direct-current power supply variable frequency air conditioner |
-
2007
- 2007-07-30 CN CNU2007200912652U patent/CN201060545Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188488B (en) * | 2007-07-30 | 2011-08-17 | 郑州春泉暖通节能设备有限公司 | Control method and device for half duplex communication receiving/transmission |
| CN109599843A (en) * | 2019-01-09 | 2019-04-09 | 深圳市德兰明海科技有限公司 | A kind of current foldback circuit and inverter of light-coupled isolation |
| CN112460748A (en) * | 2020-11-23 | 2021-03-09 | 珠海格力电器股份有限公司 | Communication device and method for internal and external machines and direct-current power supply variable frequency air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHENGZHOU CHUNQUAN ENERGY-SAVING CO., LTD. Free format text: FORMER NAME: CHUNQUAN NUANTONG ENERGY SAVING EQUIPMENT CO., LTD., ZHENGZHOU |
|
| CP03 | Change of name, title or address |
Address after: 450001 Henan Province, Zhengzhou high tech Development Zone Chuk Street No. 6 Building 1 1 unit 8 floor No. 13 Patentee after: ZHENGZHOU CHUNQUAN ENERGY-SAVING CO., LTD. Address before: The road high tech Zone screen 450001 Henan province Zhengzhou City No. 20 Patentee before: Zhengzhou Chunquan HVAC Energy-Saving Equipment Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080514 Termination date: 20160730 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |