CN214122761U - Hardware configuration isolation IO and RS485 switching circuit - Google Patents
Hardware configuration isolation IO and RS485 switching circuit Download PDFInfo
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- CN214122761U CN214122761U CN202120569209.5U CN202120569209U CN214122761U CN 214122761 U CN214122761 U CN 214122761U CN 202120569209 U CN202120569209 U CN 202120569209U CN 214122761 U CN214122761 U CN 214122761U
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Abstract
The utility model relates to a hardware configuration isolation IO and RS485 switching circuit, which belongs to the technical field of industrial process control; the hardware configuration isolation IO and RS485 switching circuit consists of a differential signal conversion unit, a single-ended signal conversion unit, a digital isolation communication unit and an isolation RS485 receiving and transmitting unit, wherein the differential signal conversion unit, the single-ended signal conversion unit, the digital isolation communication unit and the isolation RS485 receiving and transmitting unit can be used in a mixed mode at the same time, and isolation communication of various hardware configurations is realized; the utility model discloses a hardware configuration keeps apart IO and RS485 switching circuit, has not only reduced development cost, supports the isolation communication and the conversion of multiple signal, can satisfy the industrial control in-process, the communication matching between the different equipment to the device that uses can use the device substitution of the same specification; and the method has high flexibility, and can randomly adjust the configuration of the hardware circuit according to the type of the industrial field transmission signal and the number of transmission channels.
Description
Technical Field
The utility model relates to a IO and RS485 switching circuit are kept apart to hardware configuration belongs to technical field for industrial process control.
Background
In recent years, with the high-speed development of the industrial field in China, industrial equipment automation and Internet of things building need to form a system, RS485 transmission is commonly used in industry, IO interface control is needed, in order to improve the reliability of information exchange between equipment, a communication interface and an information exchange IO interface are often required to be electrically isolated, and some signals are required to be transmitted differentially; the number and the transmission direction of IO interfaces between different devices are different, so that a plurality of different switching circuits are required to carry out communication matching, and the design and development period of a hardware circuit is prolonged.
Therefore, in order to achieve the purpose of flexible hardware configuration, a flexible hardware configuration isolation IO and RS485 switching circuit is urgently needed, however, no product with the above functions is available at the present stage.
SUMMERY OF THE UTILITY MODEL
The technical demand to nimble hardware configuration, the utility model discloses a IO and RS485 switching circuit are kept apart to hardware configuration, this circuit comprises difference signal conversion unit, single-ended signal conversion unit, digital isolation communication unit, isolation formula RS485 transceiver unit, can adjust the compound mode of each conversion unit according to the application demand to realize nimble many configuration hardware switching circuit, reduce development cost, simplify the design.
The purpose of the utility model is realized like this:
a hardware configuration isolation IO and RS485 switching circuit is characterized by comprising a differential signal conversion unit, a single-ended signal conversion unit, a digital isolation communication unit and an isolation RS485 receiving and transmitting unit, wherein the differential signal conversion unit, the single-ended signal conversion unit, the digital isolation communication unit and the isolation RS485 receiving and transmitting unit can be used in a mixed mode at the same time, and isolation communication of multiple hardware configurations is achieved;
the differential signal conversion unit is composed of two single-circuit differential signal conversion circuits, each single-circuit differential signal conversion circuit generates two differential signal pairs, and can perform isolation processing on signals, each single-circuit differential signal conversion circuit is composed of a TLP2186, a 74LVC2G04 and a plurality of resistors, peripheral circuits of the TLP2186 and the TLP2186 receive two single-circuit signals, an output result is used as a positive end of an output differential signal pair, and output results of the peripheral circuits of the 74LVC2G04 and the 74LVC2G04 are used as negative ends of the differential signal pair;
the single-ended signal conversion unit is composed of two single-ended signal conversion circuits, each single-ended signal conversion circuit is composed of a TLP2168 and a plurality of resistors, two differential signal pairs are received by a TLP2186 and peripheral circuits of the TLP2186, and the TLP2186 converts input electrical signals into optical signals and then converts the optical signals into electrical signals in an electrical-optical-electrical transmission manner;
the digital isolation communication unit consists of two ADUM140X and a plurality of resistors, each ADUM140X receives or sends 4 paths of single-end signals at the same time, and the isolation communication between the digital circuit and the analog circuit is realized through the iCoupler digital interface technology of ADUM 140X;
the isolated RS485 transceiver unit consists of an ISO3082 chip and a plurality of resistors.
Has the advantages that:
first, this application provides a hardware configuration isolation IO and RS485 switching circuit.
Second, the utility model discloses reduce development cost, support the isolation communication and the conversion of multiple signal, can satisfy the industrial control in-process, communication between the different equipment matches to the device that uses can use the device of the same specification to replace.
And thirdly, the method has high flexibility, and the configuration of the hardware circuit can be adjusted at will according to the type of the industrial field transmission signals and the number of transmission channels.
Drawings
Fig. 1 is a general block diagram of the hardware configuration isolation IO and RS485 switching circuit of the present invention.
Fig. 2 is a circuit diagram of the differential signal conversion unit of fig. 1.
Fig. 3 is a circuit diagram of the one-terminal signal conversion unit in fig. 1.
Fig. 4 is a circuit diagram of the digital isolation communication unit in fig. 1.
Fig. 5 is a circuit diagram of the isolated RS485 transceiver unit in fig. 1.
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings.
Detailed description of the invention
Following is the utility model relates to a hardware configuration keeps apart IO and RS485 switching circuit's embodiment.
In this embodiment, the hardware configuration isolation IO and RS485 switching circuit is composed of a differential signal conversion unit, a single-ended signal conversion unit, a digital isolation communication unit, and an isolation RS485 transceiver unit, as shown in fig. 1, the differential signal conversion unit, the single-ended signal conversion unit, the digital isolation communication unit, and the isolation RS485 transceiver unit can be used in a mixed manner at the same time, so as to implement isolation communication of multiple hardware configurations;
the differential signal conversion unit is composed of two single-circuit differential signal conversion circuits, each single-circuit differential signal conversion circuit generates two differential signal pairs, and can perform isolation processing on signals, each single-circuit differential signal conversion circuit is composed of a TLP2186, a 74LVC2G04 and a plurality of resistors, peripheral circuits of the TLP2186 and the TLP2186 receive two single-circuit signals, an output result is used as a positive end of an output differential signal pair, and output results of the peripheral circuits of the 74LVC2G04 and the 74LVC2G04 are used as negative ends of the differential signal pair;
the single-ended signal conversion unit is composed of two single-ended signal conversion circuits, each single-ended signal conversion circuit is composed of a TLP2168 and a plurality of resistors, two differential signal pairs are received by a TLP2186 and peripheral circuits of the TLP2186, and the TLP2186 converts input electrical signals into optical signals and then converts the optical signals into electrical signals in an electrical-optical-electrical transmission manner;
the digital isolation communication unit consists of two ADUM140X and a plurality of resistors, each ADUM140X receives or sends 4 paths of single-end signals at the same time, and the isolation communication between the digital circuit and the analog circuit is realized through the iCoupler digital interface technology of ADUM 140X;
the isolated RS485 transceiver unit consists of an ISO3082 chip and a plurality of resistors.
Detailed description of the invention
Following is the utility model relates to a difference signal conversion unit's among IO and the RS485 switching circuit is kept apart to hardware configuration embodiment.
As shown in fig. 2, the differential signal conversion unit in this embodiment includes two single-circuit differential signal conversion circuits, each single-circuit differential signal conversion circuit generates two differential signal pairs, and can perform isolation processing on signals, each single-circuit differential signal conversion circuit includes one TLP2186, one 74LVC2G04, and a plurality of resistors, peripheral circuits of the TLP2186 and the TLP2186 receive the two single-terminal signals, and output results as positive terminals of the output differential signal pairs, and output results of the peripheral circuits of the 74LVC2G04 and the 74LVC2G04 are negative terminals of the differential signal pairs.
Under the condition that only one path of single-path differential signal conversion circuit works:
the single-ended control signals MIOA0, MIOA1 of the microprocessor unit are inputted to C1, C2 of TLP2168, when MIOA0, MIOA1 are set to 0, VO1 of TLP2168 outputs positive terminal signal DIOA0+ of the differential signal, VO2 of TLP2168 outputs positive terminal signal DIOA1+ of the differential signal, DIOA0+ is inputted to 1A pin of 74LVC2G04, DIOA1+ is inputted to 2A pin of 74LVC2G04, after logic conversion of 74LVC2G04, DIOA0-, DIOA 1-are outputted through 1Y, 2Y of 74LVC2G04, resulting in differential signal pairs DIOA0+ and DIOA0-, DIOA1+ and DIOA 1-which can be directly used as output signals.
Under the condition that the two single-path differential signal conversion circuits work:
the single-ended control signals MIOA0, MIOA1 of the microprocessor unit are input to C1, C1 of UA1, MIOA1 are used to control the switching of TLP2168, when MIOA1, MIOA1 are set to 0, the internal light emitting diodes between A1 and C1 are turned on, the output of each TLP2168 includes two inverters, which are acted by an inverter, the output signals are DIOA1+, DIOA 72 +, DIOA1+, DIOA positive terminal 1+, the output level of two TLP2168 is opposite to the output signals of MIOA1, MIOA 72, DIOA1+, DIOA + DIUA + 1+, DIOA + 3+, DIOA + 1+ and DIOA + 1+ 3+ DIOA + 3+ 1+ 3+ DIOA + 1+ DIOA + 1+ and DIOA + 1+ DIOA + 1+, DIOA + 3+ 1+ and DIOA + 1+ DIOA + 1+ 3+ DIOA + 1+ DIOA1+ DIOA + 1+ DIOA + 1+ DIOA + 1+ DIOA, 2Y outputs, the obtained DIOA0-, DIOA1-, DIOA 2-and DIOA 3-signals are used as negative side signals of the differential signals, thus forming four pairs of differential signals, namely DIOA0+ and DIOA0-, DIOA1+ and DIOA1-, DIOA2+ and DIOA2-, DIOA3+ and DIOA3-, and the converted differential signal pairs can be directly used as control signals of external equipment.
Detailed description of the invention
The following is the utility model relates to a single-ended signal conversion unit's among IO and the RS485 switching circuit is kept apart to hardware configuration embodiment.
As shown in fig. 3, the single-ended signal conversion unit in this embodiment is composed of two single-ended signal conversion circuits, each single-ended signal conversion circuit is composed of a TLP2168 and a plurality of resistors, two differential signal pairs are received by a TLP2186 and a peripheral circuit of the TLP2186, and the TLP2186 converts an input electrical signal into an optical signal and then converts the optical signal into an electrical signal in an electrical-optical-electrical transmission manner.
Under the condition that only one single-circuit single-ended signal conversion circuit works:
an externally input DIOA0+ and DIOA0-, DIOA1+ and DIOA 1-differential signal pair is used as an input signal of the TLP2186, DIOA0+ and DIOA 0-are input to pins A1 and C1 of the TLP2186, DIOA1+ and DIOA 1-are input to pins C2 and A2 of the TLP2186, when DIOA0-, DIOA 1-input is high level, DIOA0+, DIOA1+ input is low level, the TIP2186 outputs 2 single-end signals as MIOA0 and MIOA1, respectively, and the obtained single-end signals can be directly used as the input of the microprocessor.
Under the condition that the two single-ended signal conversion circuits work:
the external input pairs of DIOA0+ and DIOA0-, DIOA1+ and DIOA1-, DIOA2+ and DIOA2-, DIOA3+ and DIOA 3-differential signal as input signals of TLP2186, DIOA0+ and DIOA 0-input to pins A1 and C1 of UA10, DIOA1+ and DIOA 1-input to pins C2 and A2 of UA10, DIOA2+ and DIOA 2-input to pins A2 and C2 of UA 2, DIOA2+ and DIOA 2-input to pins C2 and A2 of UA 2, when the internal light emitting diodes of DIOA2-, DIOA 2-input high level, DIOA2+, DIOA +, DI3672 +, DIOA2+ input low level, TIP 6, each internal light emitting diode as internal light emitting diode, and internal light emitting diode as output signal of the microprocessor, the internal light emitting diode and the internal light emitting diode as single-end of the MIOA2 and the output of the microprocessor.
Detailed description of the invention
Following is the utility model relates to a digital isolation communication unit's among IO and the RS485 through-circuit is kept apart to hardware configuration concrete implementation.
As shown in fig. 4, the digital isolation communication unit in this embodiment is composed of two admum 140X and a plurality of resistors, each of the admum 140X receives or transmits 4 paths of single-ended signals at the same time, and the digital isolation communication between the digital circuit and the analog circuit is implemented by the icompler digital interface technology of the admum 140X.
The method comprises the following specific steps: two ADUM140X are placed in a mirror image mode, only one ADUM140 is needed to be welded in practical application, if a digital isolation IO interface needs to be expanded in the later period, the other ADUM140X is needed to be welded, pins VDD1 and VE1 of UA3 are connected to 3.3V voltage provided by a microprocessor, GND1 is connected to digital ground GND, pins VDD2 and VE2 are connected to 5V voltage provided by an analog circuit part, GND2 is connected to analog ground GNDA, a VIA pin is connected to an IOA0 pin of the microprocessor, the LIOA0 signal is isolated and then output through a VOA pin RIOA0 signal, the VOA pin is connected to an external output terminal PIOA0, a pin is connected to an IOA1 pin of the microprocessor, the LIOA1 signal is isolated and then output through a VOA 1 signal, the VOA pin is connected to an external output terminal PIOA1, a C pin is connected to an external input terminal PIOA2, the RIOA2 signal is isolated and then output through a pin 5, the IOA pin is connected to an external input terminal PIOA pin 2, after the RIOA3 signal is isolated, LIOA3 signal is output through VOD pin, VOC pin is connected with IOA3 pin of microprocessor, the microprocessor is used as reference point, VIA and VOA, VIB and VOB are two ways of isolated signal output, VIC and VOC, VID and VOD are two ways of isolated signal input, thus realizing isolated communication between digital part and analog part.
Detailed description of the invention
Following is the utility model relates to an isolated RS485 receiving and dispatching unit's among hardware configuration isolation IO and the RS485 through circuit embodiment.
As shown in fig. 5, the isolated RS485 transceiver unit according to this embodiment includes one piece of ISO3082 and a plurality of resistors.
The method comprises the following specific steps: a pin VDD1 is connected with a 3.3V power supply, a pin GND1 is connected with a digital ground, a pin VDD2 is connected with a 5V power supply, a pin GND2 is connected with an analog ground, a pin R is connected with a pin RXA of a microprocessor, the main function of the device is to receive input signals, the RE pin and the DE pin are connected with the DEVA pin of the microprocessor, used for transmitting read-write enable signals, a pin D is connected with a pin TXA of the microprocessor and used for sending output control signals, a pin A is connected with an external output terminal A485A, used for transmitting the A end signal of the RS485, the B pin is connected with the external output terminal of the A485B, used for transmitting the B-terminal signal of RS485, the IOS3082 has the function of bidirectional conversion, when the microprocessor is used as a receiving end, the IOS3082 converts the A485A and B485B signals into RXA signals suitable for being received by the microprocessor, when the microprocessor is used as a transmitting terminal, the IOS3082 converts the TXA signal of the microprocessor into A485A and B485B signals suitable for RS485 communication.
It should be noted that, in the differential signal conversion unit, the case where only one single-path differential signal conversion circuit works and the case where both the two single-path differential signal conversion circuits work are defined as a working condition a1 and a working condition a2, respectively; in the single-ended signal conversion unit, the condition that only one single-ended signal conversion circuit works and the condition that both single-ended signal conversion circuits work are defined as a working condition B1 and a working condition B2 respectively; in this application hardware configuration isolation IO and RS485 switching circuit, can carry out four kinds of combinations of operating mode A1 and operating mode B1, operating mode A1 and operating mode B2, operating mode A2 and operating mode B1, operating mode A2 and operating mode B2.
It should be noted that the present application relates to circuits and electronic components and modules, all of which are prior art, and that the present invention is fully capable of implementation by those skilled in the art, and is not limited to software and process modifications.
Claims (1)
1. A hardware configuration isolation IO and RS485 switching circuit is characterized by comprising a differential signal conversion unit, a single-ended signal conversion unit, a digital isolation communication unit and an isolation RS485 receiving and transmitting unit, wherein the differential signal conversion unit, the single-ended signal conversion unit, the digital isolation communication unit and the isolation RS485 receiving and transmitting unit can be used in a mixed mode at the same time, and isolation communication of multiple hardware configurations is achieved;
the differential signal conversion unit is composed of two single-circuit differential signal conversion circuits, each single-circuit differential signal conversion circuit generates two differential signal pairs, and can perform isolation processing on signals, each single-circuit differential signal conversion circuit is composed of a TLP2186, a 74LVC2G04 and a plurality of resistors, peripheral circuits of the TLP2186 and the TLP2186 receive two single-circuit signals, an output result is used as a positive end of an output differential signal pair, and output results of the peripheral circuits of the 74LVC2G04 and the 74LVC2G04 are used as negative ends of the differential signal pair;
the single-ended signal conversion unit is composed of two single-ended signal conversion circuits, each single-ended signal conversion circuit is composed of a TLP2168 and a plurality of resistors, two differential signal pairs are received by a TLP2186 and peripheral circuits of the TLP2186, and the TLP2186 converts input electrical signals into optical signals and then converts the optical signals into electrical signals in an electrical-optical-electrical transmission manner;
the digital isolation communication unit consists of two ADUM140X and a plurality of resistors, each ADUM140X receives or sends 4 paths of single-end signals at the same time, and the isolation communication between the digital circuit and the analog circuit is realized through the iCoupler digital interface technology of ADUM 140X;
the isolated RS485 transceiver unit consists of an ISO3082 chip and a plurality of resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120569209.5U CN214122761U (en) | 2021-03-20 | 2021-03-20 | Hardware configuration isolation IO and RS485 switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120569209.5U CN214122761U (en) | 2021-03-20 | 2021-03-20 | Hardware configuration isolation IO and RS485 switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214122761U true CN214122761U (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120569209.5U Expired - Fee Related CN214122761U (en) | 2021-03-20 | 2021-03-20 | Hardware configuration isolation IO and RS485 switching circuit |
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| CN (1) | CN214122761U (en) |
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2021
- 2021-03-20 CN CN202120569209.5U patent/CN214122761U/en not_active Expired - Fee Related
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