CN112118084A - Half-duplex differential bus isolation relay device and data line transmission system - Google Patents
Half-duplex differential bus isolation relay device and data line transmission system Download PDFInfo
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- CN112118084A CN112118084A CN202010910813.XA CN202010910813A CN112118084A CN 112118084 A CN112118084 A CN 112118084A CN 202010910813 A CN202010910813 A CN 202010910813A CN 112118084 A CN112118084 A CN 112118084A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/36—Repeater circuits
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Abstract
The invention relates to a half-duplex differential bus isolation relay device and a data line transmission system. A half-duplex differential bus isolation relay device comprises a first transceiver, a second transceiver, a signal isolator, a first power supply and a second power supply; the receiving end of the first transceiver is connected with the control end of the second transceiver through the signal isolator, and the control end of the first transceiver is connected with the receiving end of the second transceiver through the signal isolator; the transmitting ends of the first transceiver and the second transceiver are grounded; the first power supply and the second power supply provide power to the first transceiver and the second transceiver, respectively. The invention provides an isolation relay device, which realizes accurate transmission of signals in a line system by simply using a first transceiver, a second transceiver and a signal isolator, does not need transfer processing, and is quick and convenient.
Description
Technical Field
The invention relates to signal transmission, in particular to a half-duplex differential bus isolation relay device and a data line transmission system.
Background
The differential circuit has the characteristics of wide application, strong anti-interference capability and long transmission distance. In long distance transmission, due to potential variation and driving capability problems, relaying or isolation is often required. In the traditional mode, the differential data needs to be transmitted after being encoded and analyzed, and the participation of a CPU (central processing unit) is needed for control, so that the cost is high.
In the existing mode, mostly, a differential bus converts a differential signal into a normal data stream through a transceiver, the data stream is analyzed by using a CPU and then transmitted through another transceiver, the two transceivers are isolated, and the two transceivers use two independent isolation power supplies. The purpose of relaying and isolating is realized.
Patent document CN202010107445.5 discloses a serial communication relay apparatus and a system, the serial communication relay apparatus being located at one end of a communication exchange and relaying communication with another serial communication relay apparatus located at the other end of the communication exchange, the serial communication relay apparatus including: the device comprises a half-duplex transceiving circuit, a full-duplex transceiving circuit, a coding and decoding circuit and an optical module; the method does not change the bus communication interface of the original control system equipment, adopts a serial communication relay device irrelevant to a protocol, and solves the problems that the distance of the tested equipment in a semi-physical simulation system is too large, and the asynchronous serial communication and the customized synchronous serial communication cannot be correctly interacted through digital signal sampling and reconstruction and optical/electrical conversion. However, the above problem still cannot be solved, and a processor is still required to implement the line transmission.
Therefore, the existing half-duplex relay technology has the defects and needs to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide a half-duplex differential bus isolation relay device and a data line transmission system, which can effectively solve the technical problems mentioned in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a half-duplex differential bus isolation relay device comprises a first transceiver, a second transceiver, a signal isolator, a first power supply and a second power supply;
the receiving end of the first transceiver is connected with the control end of the second transceiver through the signal isolator, and the control end of the first transceiver is connected with the receiving end of the second transceiver through the signal isolator; the transmitting ends of the first transceiver and the second transceiver are grounded; the first power supply and the second power supply provide power to the first transceiver and the second transceiver, respectively.
Preferably, the half-duplex differential bus isolation relay device comprises a signal isolator and a signal isolator, wherein the signal isolator comprises a first isolator and a second isolator; the input end of the first isolator is connected with the receiving end of the first transceiver, and the output end of the first isolator is connected with the control end of the second transceiver; the input end of the second isolator is connected with the receiving end of the second transceiver, and the output end of the second isolator is connected with the control end of the first transceiver.
Preferably, in the half-duplex differential bus isolation relay device, the first isolator and the second isolator adopt the same isolation optocoupler.
Preferably, in the half-duplex differential bus isolation relay device, an input end of the first isolation optocoupler and an output end of the second isolation optocoupler are respectively connected to the first power supply; the output end of the first isolation optocoupler and the input end of the second isolation optocoupler are respectively connected with the second power supply.
Preferably, in the half-duplex differential bus isolation relay device, the first isolation optocoupler is an isolation optocoupler with a model number of TPL 785.
Preferably, in the half-duplex differential bus isolation relay device, the second isolation optocoupler is an isolation optocoupler with a model number of TPL 785.
Preferably, the first transceiver of the half-duplex differential bus isolation relay device has a first differential transceiver chip with a model number of SN65HVD 32.
Preferably, the half-duplex differential bus isolation relay device, the second transceiver has a second differential transceiver chip, model number SN65HVD 32.
A data line transmission system, wherein each segment of the data line is connected using the apparatus of any one of claims 1-8.
Compared with the prior art, the half-duplex differential bus isolation relay device and the data line transmission system provided by the invention have the following beneficial effects:
1) the invention provides an isolation relay device, which simply uses a first transceiver/a second transceiver and a signal isolator to realize accurate transmission of signals in a line system, does not need transfer processing, and is quick and convenient;
2) the isolation relay device provided by the invention is constructed by using the differential transceiving chip and the isolation optocoupler, can ensure real-time transmission in the transmission of communication signals, does not cause distortion, and has great progress;
3) the data line transmission system provided by the invention uses the isolation relay device provided by the invention to realize rapid signal transmission and ensure that the communication signal is not distorted in long-distance transmission.
Drawings
Fig. 1 is a block diagram of an isolation relay device according to the present invention;
fig. 2 is a block diagram of an embodiment of an isolated relay device provided in the present invention;
fig. 3 is a circuit diagram of an isolated repeater device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a half-duplex differential bus isolation relay device, which is characterized in that the device comprises a first transceiver 1, a second transceiver 2, a signal isolator 3, a first power source 4 and a second power source 5; generally, the first transceiver 1 and the second transceiver 2 are transceiver devices commonly used in the art, and each transceiver device has a receiving end, a transmitting end, and a control end, and the first transceiver and the second transceiver perform single-ended signal synthesis by using level signals received by the transmitting end and the receiving end to cooperate with a level signal of the control end.
The receiving end of the first transceiver 1 is connected with the control end of the second transceiver 2 through the signal isolator 3, and the control end is connected with the receiving end of the second transceiver 2 through the signal isolator 3; the transmitting ends of the first transceiver 1 and the second transceiver 2 are both grounded; the first power supply 4 and the second power supply 5 supply power to the first transceiver 1 and the second transceiver 2, respectively. In a specific implementation, the device is installed at a node in a communication line, the first transceiver 1 and the second transceiver 2 are respectively used for receiving a communication signal transmitted by the line and transmitting the received communication signal to a transceiver at the other end (the communication signal received by the first transceiver 1 is transmitted to the second transceiver 2; the communication signal received by the second transceiver 2 is transmitted to the first transceiver 1) with two line end points of the line node; in addition, a communication signal transmitted by another transceiver needs to be transmitted in the connected line. The first transceiver 1 and the second transceiver 2 are both differential transceivers, and are used for performing interconversion between differential signals and single-ended signals; the signal isolator 3 is used for realizing level isolation between the first transceiver 1 and the second transceiver 2, preventing signal serial interference and realizing accurate signal transmission; the first power source 4 and the second power source 5 are both power sources commonly used in the art, such as a storage battery.
Specifically, the working principle of the device is as follows: after receiving the differential signal of the line, the first transceiver 1 converts the differential signal into a single-ended signal, transmits the single-ended signal to the second transceiver 2 through the signal isolator 3, and the second transceiver 2 converts the single-ended signal into a differential signal and transmits the differential signal to the line, so that a transfer processing device is not needed, and the method is fast and convenient. The operation principle of the second transceiver 2 is the same as that described above, and is not limited.
The further operating principle of the device of the invention is: when the first transceiver 1 receives the differential signal, the differential signal is converted into a single-ended signal, an action port for sending the single-ended signal to the outside is a receiving end at the moment, the single-ended signal is transmitted to the control end of the second transceiver 2 in a high-low level mode, and the sending ends of the two transceivers are grounded and output a low level in a default mode; when the receiving end of the first transceiver 1 sends a low level, the control end of the second transceiver 2 receives the low level, the second transceiver 2 defaults to use a level signal obtained by the sending end, namely a low level signal, to participate in differential signal conversion and sending, when the first transceiver 1 sends a high level signal through the receiving end, the control end of the second transceiver 2 obtains a high level signal, and then the differential signal is exchanged by using the high level signal. The process of transmitting and converting the information of the second transceiver 2 is similar to the above process, and is not described in detail.
Preferably, in this embodiment, the signal isolator 3 includes a first isolating optocoupler U2 and a second isolating optocoupler U3; the input end of the first isolation optocoupler U2 is connected with the first transceiver 1, and the output end of the first isolation optocoupler U2 is connected with the second transceiver 2; the input end of the second isolation optocoupler U3 is connected with the second transceiver 2, and the output end of the second isolation optocoupler U3 is connected with the second transceiver 2.
Specifically, in this embodiment, the two isolation optocouplers respectively perform positive phase transmission (i.e., the original transmission of the binary data of the single-ended signal) and reverse phase transmission (i.e., the reverse transmission of the binary data of the single-ended signal).
In positive transmission, the anode of the diode at the input end of the first isolation optocoupler U2 is connected to the receiving end of the first transceiver 1, and the collector at the output end is connected to the second power supply 5. When the receiving end of the first transceiver 1 sends a high level, the first isolation optocoupler U2 is activated to send a high level signal to the control end of the second transceiver 2 to form a high level signal; on the contrary, when the receiving end of the first transceiver 1 sends a low level, the first isolation optocoupler U2 is not activated, and at this time, the control end of the second transceiver 2 does not generate a high level, and a low level signal received by the sending end is used by default, so as to form a single-ended signal by repeating the steps, and further perform conversion of the differential signal.
In reverse transmission, the anode of the diode at the input end of the first isolation optocoupler U2 is connected with the first power supply 4, the cathode of the diode is connected with the receiving end of the first transceiver 1, and the collector at the output end of the first isolation optocoupler U2 is connected with the second power supply 5. When the receiving end of the first transceiver 1 sends a low level, the first isolation optocoupler U2 is activated to send a high level signal to the control end of the second transceiver 2 to form a high level signal; on the contrary, when the receiving end of the first transceiver 1 sends a low level, the first isolation optocoupler U2 is activated, and at this time, the control end of the second transceiver 2 obtains a high level, and the low level signal received by the sending end is used by default, so as to form an inverted single-ended signal in a reciprocating manner, and further perform conversion of the differential signal. The two signal transmission methods may be preset in two transceivers, and the setting method is a common technical means in the field and is not limited.
Preferably, in this embodiment, the first isolation optocoupler U2 and the second isolation optocoupler U3 both use isolation optocouplers of model TPL 785.
Preferably, reverse data transmission is preferentially used, that is, in this embodiment, an input end of the first isolation optocoupler U2 and an output end of the second isolation optocoupler U3 are respectively connected to the first power supply 4; the output end of the first isolation optocoupler U2 and the input end of the second isolation optocoupler U3 are respectively connected with the second power supply 5.
In an implementation, two input ends of the first isolating optocoupler U2 are connected to the first transceiver 1 and the first power supply 4, respectively, and when the first transceiver 1 receives a differential signal, the differential signal is converted into a single-ended signal and transmitted to an input end of the first isolating optocoupler U2, where the first isolating optocoupler U2 is activated; two input ends of the first isolation optocoupler U2 are respectively connected with the second power supply 5 and the second transceiver 2, and after the first isolation optocoupler U2 is activated, a switch at an output end of the first isolation optocoupler is switched on and off according to the single-ended signal, and the first isolation optocoupler is matched with the second power supply 5 to form a single-ended signal which is input into the second transceiver 2. The working principle of the second isolation optocoupler U3 is the same as that described above, and is not described herein again. Under the condition of no signal transmission, the first/second isolation optocoupler is not activated, and at the moment, the first/second power supply only supplies power to the first/second transceiver, so that real-time receiving of differential signals is realized.
Preferably, in this embodiment, the first transceiver 1 has a first differential transceiver chip U1 with a model number SN65HVD 32.
Preferably, in this embodiment, the second transceiver 2 has a second differential transceiver chip U2 with a model number SN65HVD 32.
Specifically, the VCC pin of the first differential transceiver chip U1 is connected to the first power supply 4, in the absence of differential signals, the real-time standby detection is carried out, when the A/B pin of the first differential transceiver chip U1 receives a first differential signal A1-B1, a single-ended signal is sent through the R pin, at which time the first isolating optocoupler U2 is activated according to the characteristics of the single-ended signal, thereby transmitting the single-ended signal to the RE # pin (controlled pin) and the DE pin of the second differential transceiver chip U2, when the RE # pin of the second differential transceiver chip U2 has a level inflow, it will no longer accept differential signals, while, at the same time, accepting the single-ended signal through the DE pin, and then converted into a second differential signal A2-B2, and then transmitted to the connected circuit through the A/B of the second differential transceiver chip. Specifically, the reverse working principle is the same, and is not described herein.
Correspondingly, the invention also provides a data line transmission system, and each section of line node in the data line is connected by using the device. In specific implementation, generally, the device is applied to an RS485 link, and communication distortion is caused due to an excessively long communication line, so that stable transmission of communication signals can be realized by using the device for transfer, and the definition of the signals is ensured.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (9)
1. A half-duplex differential bus isolation relay device is characterized by comprising a first transceiver, a second transceiver, a signal isolator, a first power supply and a second power supply;
the receiving end of the first transceiver is connected with the control end of the second transceiver through the signal isolator, and the control end of the first transceiver is connected with the receiving end of the second transceiver through the signal isolator; the transmitting ends of the first transceiver and the second transceiver are grounded; the first power supply and the second power supply provide power to the first transceiver and the second transceiver, respectively.
2. The half-duplex differential bus isolation relay device of claim 1, wherein the signal isolator comprises a first isolator and a second isolator; the input end of the first isolator is connected with the receiving end of the first transceiver, and the output end of the first isolator is connected with the control end of the second transceiver; the input end of the second isolator is connected with the receiving end of the second transceiver, and the output end of the second isolator is connected with the control end of the first transceiver.
3. The half-duplex differential bus isolation relay device of claim 2, wherein the first isolator and the second isolator employ the same isolation optocoupler.
4. The half-duplex differential bus isolation relay device of claim 3, wherein an input of the first isolation optocoupler and an output of the second isolation optocoupler are connected to the first power supply, respectively; the output end of the first isolation optocoupler and the input end of the second isolation optocoupler are respectively connected with the second power supply.
5. The half-duplex differential bus isolation relay device of claim 3, wherein the first isolation optocoupler is an isolation optocoupler of model TPL 785.
6. The half-duplex differential bus isolation relay device of claim 3, wherein the second isolation optocoupler is an isolation optocoupler of model TPL 785.
7. The half-duplex differential bus isolation relay device of claim 1, wherein the first transceiver has a first differential transceiver chip model SN65HVD 32.
8. The half-duplex differential bus isolation relay device of claim 1, wherein the second transceiver has a second differential transceiver chip model SN65HVD 32.
9. A data transmission system in which data link nodes in each segment of a data link are connected using the apparatus of any one of claims 1 to 8.
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| CN202010910813.XA CN112118084A (en) | 2020-09-02 | 2020-09-02 | Half-duplex differential bus isolation relay device and data line transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113783584A (en) * | 2021-11-11 | 2021-12-10 | 汇智机器人科技(深圳)有限公司 | Isolated single-wire serial communication device and method |
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2020
- 2020-09-02 CN CN202010910813.XA patent/CN112118084A/en active Pending
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| CN109597783A (en) * | 2018-11-30 | 2019-04-09 | 中国电子科技集团公司第四十八研究所 | A kind of double light-coupled isolation type RS485 circuits |
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