Remote SSI sensor communication system

Abstract

The utility model relates to a long-distance SSI sensor communication system, which belongs to the technical field of communication technology, and comprises a device, the device is connected with a first conversion circuit used for converting a TTL level signal and an RS485 signal, the first conversion circuit is connected with a transmission circuit, and the transmission circuit is connected with a second conversion circuit. The transmission circuit is connected with a second conversion circuit used for converting TTL level signals and RS485 signals, and the second conversion circuit is connected with a sensor. According to the invention, long-distance stable communication can be realized.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a long-range SSI sensor communication system. Background Technology

[0002] In the field of industrial automation, especially in data communication between sensors and devices, various communication interfaces are widely used to improve system reliability and efficiency. Among them, the Synchronous Serial Interface (SSI) has been widely used in many industrial scenarios due to its high-speed and efficient data transmission capabilities and low cost advantages. However, its transmission distance is relatively short, which limits the communication distance between sensors and devices.

[0003] Among existing technical solutions, the Synchronous Serial Interface (SSI) has been widely used in many industrial scenarios due to its high-speed and efficient data transmission capabilities and low cost advantages.

[0004] Although the above methods can meet the needs of communication over a certain distance, their transmission distance is relatively short, which limits the communication distance between sensors and devices. They still cannot meet the needs of long-distance communication. How to achieve stable communication over long distances is a technical problem that urgently needs to be solved. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a long-range SSI sensor communication system that enables stable communication over long distances.

[0006] This application provides a long-distance SSI sensor communication system using the following technical solution:

[0007] A long-range SSI sensor communication system includes a device connected to a first conversion circuit for converting TTL level signals to RS485 signals. The first conversion circuit is connected to a transmission circuit, and the transmission circuit is connected to a second conversion circuit for converting TTL level signals to RS485 signals. The second conversion circuit is connected to a sensor.

[0008] By adopting the above technical solution, the device can convert the generated TTL level signal into an RS485 signal in the first conversion circuit, transmit it over a long distance through the transmission circuit, and then convert the RS485 signal back into a TTL level signal through the second conversion circuit to achieve long-distance communication with the sensor; the sensor then converts the generated TTL level signal back into an RS485 signal to communicate with the device, thus achieving long-distance full-duplex communication.

[0009] This application further specifies that: the device is connected to the first conversion circuit via the SSI protocol, and the sensor is connected to the second conversion circuit via the SSI protocol.

[0010] By adopting the above technical solutions, SSI can be configured for different data rates and formats, supporting data transmission over longer distances.

[0011] This application further provides that: the first conversion circuit includes a first RS485 / RS422 transceiver, the DI pin of the first RS485 / RS422 transceiver is connected to the SCK pin of the device via the SSI protocol, and the Y port and Z port of the first RS485 / RS422 transceiver are connected to the second conversion circuit via a transmission circuit.

[0012] By adopting the above technical solution, the SCK pin of the device inputs the TTL signal of the clock signal in the SPI communication protocol to the DI pin of the first LTC2582. After receiving the TTL signal, the DI pin of the first LTC2582 converts it into an RS485 signal. The Y and Z ports of the first LTC2582 are responsible for outputting the RS485 signal to the second conversion circuit.

[0013] This application further specifies that: the second conversion circuit includes a second RS485 / RS422 transceiver, the A port of the second RS485 / RS422 transceiver is connected to the Y port of the first RS485 / RS422 transceiver through a transmission circuit, the B port of the second RS485 / RS422 transceiver is connected to the Z port of the first RS485 / RS422 transceiver through a transmission circuit, and the RO pin of the second RS485 / RS422 transceiver is connected to the SCK pin of the sensor through the SSI protocol.

[0014] By adopting the above technical solution, after receiving the RS485 signal transmitted from the Y and Z ports of the first RS485 / RS422 transceiver, the A and B ports of the second RS485 / RS422 transceiver convert the RS485 signal into a TTL signal and transmit the TTL signal from the RO pin to the SCK pin of the sensor, thereby realizing long-distance communication between the device and the sensor.

[0015] This application further specifies that the DO pin of the sensor is connected to the DI pin of the second RS485 / RS422 transceiver via the SSI protocol.

[0016] By adopting the above technical solution, the DO pin of the sensor inputs the TTL signal to the DI pin of the second RS485 / RS422 transceiver, and the second RS485 / RS422 transceiver converts the TTL signal into an RS485 signal.

[0017] This application further specifies that: the Z port of the second RS485 / RS422 transceiver is connected to the B port of the first RS485 / RS422 transceiver through a transmission circuit, and the Y port of the second RS485 / RS422 transceiver is connected to the A port of the first RS485 / RS422 transceiver through a transmission circuit.

[0018] By adopting the above technical solution, the Y and Z ports of the second RS485 / RS422 transceiver transmit the RS485 signal converted from the TTL signal to the first RS485 / RS422 transceiver, and the first RS485 / RS422 transceiver receives the RS485 signal through the A and B ports.

[0019] This application further specifies that the RO pin of the first RS485 / RS422 transceiver is connected to the DI pin of the device via the SSI protocol.

[0020] By adopting the above technical solution, after the first RS485 / RS422 transceiver converts the RS485 signal into a TTL signal, it transmits the TTL signal to the DI pin of the device through the RO pin of the first RS485 / RS422 transceiver. At this time, the device receives the signal from the sensor, realizing full-duplex long-distance signal transmission.

[0021] This application further specifies that the first RS485 / RS422 transceiver and the second RS485 / RS422 transceiver are LTC2852.

[0022] By adopting the above technical solution, the LTC2852, as an RS485 / RS422 transceiver, can support data transmission rates up to 20Mbps, enabling RS422 signals to be converted into RS485 signals.

[0023] This application further specifies that the transmission circuit includes a shielded twisted pair cable, and the first conversion circuit and the second conversion circuit transmit data via the shielded twisted pair cable.

[0024] By adopting the above technical solution, using shielded twisted-pair cable can effectively reduce electromagnetic interference and maintain signal integrity, thereby supporting longer transmission distances for RS485 signals and enabling full-duplex communication between the device and the sensor side.

[0025] In summary, this application has the following beneficial effects:

[0026] The device and sensor in this application are connected to an RS485 / RS422 transceiver via the SSI protocol, which performs bidirectional conversion between TTL level signals and RS485 signals. By utilizing the high transmission rate and long transmission distance of RS485, the performance of long-distance communication is significantly improved, solving the problem of limited transmission distance in the prior art. The use of shielded twisted-pair cable as the transmission medium effectively reduces electromagnetic interference and improves the stability and reliability of signal transmission. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall circuit structure of this application.

[0028] Reference numerals: 1. Equipment; 2. First conversion circuit; 20. First RS485 / RS422 transceiver; 3. Second conversion circuit; 30. Second RS485 / RS422 transceiver; 4. Sensor; 5. Shielded twisted pair cable. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 This application will be described in further detail below.

[0030] refer to Figure 1 In this embodiment, a long-range SSI sensor communication system includes a device 1 connected to a first conversion circuit 2. The first conversion circuit 2 converts the TTL level signal input to the device 1 into an RS485 signal. TTL signals are typically used for short-range communication, but their signal attenuation is rapid, making them unsuitable for long-distance transmission. RS485 signals have stronger driving capabilities and can support longer communication distances. Specifically, the first conversion circuit 2 converts the TTL level signal of the device 1 into an RS485 signal. The first conversion circuit 2 is connected to a transmission circuit, which is connected to a second conversion circuit 3. Utilizing the strong anti-interference capability of RS485 signals and their theoretical transmission distance of up to 1200 meters (and actual transmission distance of up to 3000 meters), the transmission circuit can transmit the RS485 signal output from the first conversion circuit 2 to the long-distance second conversion circuit 3. The second conversion circuit 3 performs the conversion between TTL level signals and RS485 signals; specifically, the first conversion circuit 2 converts the RS485 signal of the device 1 into a TTL level signal. The second conversion circuit 3 is connected to the sensor 4. When the sensor 4 sends a TTL level signal, the second conversion circuit 3 converts the TTL level signal into an RS485 signal, and then transmits the RS485 signal to the first conversion circuit 2 through the transmission circuit. The first conversion circuit 2 then converts the RS485 signal back into a TTL level signal and transmits it to the device 1, thereby realizing long-distance full-duplex communication between the device 1 and the sensor 4.

[0031] This application further specifies that: device 1 is connected to the first conversion circuit 2 via the SSI protocol, and sensor 4 is connected to the second conversion circuit 3 via the SSI protocol. SSI can be configured to different data rates and formats to support data transmission over longer distances.

[0032] Furthermore, the first conversion circuit 2 includes a first RS485 / RS422 transceiver 20. The SSI protocol is designed based on the full-duplex characteristics of RS422. Directly replacing the RS422 interface of SSI with an RS485 interface may lead to incompatibility. Therefore, an RS485 / RS422 transceiver is used to convert the RS422 signal to an RS485 signal. The DI pin of the first RS485 / RS422 transceiver 20 is connected to the SCK pin of device 1 via the SSI protocol. The RE# pin of the first RS485 / RS422 transceiver 20 is grounded, and the DE pin is connected to VCC. The Y and Z ports of the first RS485 / RS422 transceiver 20 are connected to the second conversion circuit 3 via a transmission circuit. The SCK pin of device 1 inputs the TTL clock signal to the DI pin of the first LTC2582. The DI pin of the first LTC2582 receives the TTL signal and converts it into an RS485 signal. The Y and Z ports of the first LTC2582 are responsible for outputting the RS485 signal to the second conversion circuit 3. Therefore, the first RS485 / RS422 transceiver 20 converts the TTL signal of device 1 into an RS485 signal for transmission in the transmission circuit, thereby increasing the transmission distance of device 1.

[0033] Furthermore, the second conversion circuit 3 includes a second RS485 / RS422 transceiver 30. The A port of the second RS485 / RS422 transceiver 30 is connected to the Y port of the first RS485 / RS422 transceiver 20 through a transmission circuit. The B port of the second RS485 / RS422 transceiver 30 is connected to the Z port of the first RS485 / RS422 transceiver 20 through a transmission circuit. The RE# pin of the second RS485 / RS422 transceiver 30 is grounded, and the DE pin is connected to VCC. The Y and Z ports of the first RS485 / RS422 transceiver 20 transmit the RS485 signal converted from the TTL signal of device 1 to the A and B ports of the second RS485 / RS422 transceiver 30. The second RS485 / RS422 transceiver 30 converts the RS485 signal into a TTL signal. The RO pin of the second RS485 / RS422 transceiver 30 is connected to the SCK pin of the sensor 4 through the SSI protocol. The second RS485 / RS422 transceiver 30 transmits the TTL signal from the RO pin to the SCK pin of the sensor 4, realizing long-distance communication between device 1 and sensor 4.

[0034] Furthermore, the DO pin of sensor 4 is connected to the DI pin of the second RS485 / RS422 transceiver 30 via the SSI protocol. The DO pin of sensor 4 inputs the TTL signal to the DI pin of the second RS485 / RS422 transceiver 30 to realize the RS485 signal conversion before the long-distance signal transmission from sensor 4 to device 1.

[0035] Furthermore, the Z port of the second RS485 / RS422 transceiver 30 is connected to the B port of the first RS485 / RS422 transceiver 20 through a transmission circuit, and the Y port of the second RS485 / RS422 transceiver 30 is connected to the A port of the first RS485 / RS422 transceiver 20 through a transmission circuit. The Y and Z ports of the second RS485 / RS422 transceiver 30 transmit the RS485 signal converted from the TTL signal to the first RS485 / RS422 transceiver 20. The first RS485 / RS422 transceiver 20 receives the RS485 signal through the A and B ports, thus realizing long-distance signal transmission between the two RS485 / RS422 transceivers.

[0036] Furthermore, the RO pin of the first RS485 / RS422 transceiver 20 is connected to the DI pin of device 1 via the SSI protocol. After the first RS485 / RS422 transceiver 20 converts the RS485 signal transmitted by the second RS485 / RS422 transceiver 30 through the transmission circuit into a TTL signal, the first RS485 / RS422 transceiver 20 transmits the TTL signal to the DI pin of device 1 through the RO pin of the first RS485 / RS422 transceiver 20. At this time, device 1 receives the signal from sensor 4, thereby realizing full-duplex long-distance signal transmission between device 1 and sensor 4.

[0037] In addition, the first RS485 / RS422 transceiver 20 and the second RS485 / RS422 transceiver 30 are LTC2852. The LTC2852 is a 3.3V 20Mbps RS485 / RS422 transceiver manufactured by Analog Devices. It supports RS485 and RS422 communication protocols, can achieve a data transmission rate of up to 20Mbps under 3.3V power supply, can convert TTL signals to RS485 signals, and also supports switching between RS485 and RS422 communication protocols.

[0038] Furthermore, the transmission circuit includes shielded twisted-pair cable 5, through which the first conversion circuit 2 and the second conversion circuit 3 transmit data. The shielded twisted-pair cable 5 effectively resists electromagnetic interference and noise interference, ensuring signal stability and reliability, which is crucial for applications requiring stable data transmission. The shielded twisted-pair cable 5 also allows for better transmission distance of RS485 signals, enabling full-duplex communication between device 1 and sensor 4.

[0039] The implementation principle of this application embodiment is as follows: Using an RS485 / RS422 transceiver of model LTC2852, the TTL signal of device 1 is transmitted via the SSI protocol, and then converted into an RS485 signal by the first RS485 / RS422 transceiver 20. The RS485 signal is then transmitted to the second RS485 / RS422 transceiver 30 via shielded twisted pair cable 5. The second RS485 / RS422 transceiver 30 then converts the RS485 signal back into a TTL signal and transmits it to the sensor via the SSI protocol. Device 4 enables long-distance communication between device 1 and sensor 4; sensor 4 converts the TTL signal into an RS485 signal capable of long-distance transmission through the second RS485 / RS422 transceiver 30, and transmits the RS485 signal to the first RS485 / RS422 transceiver 20 through shielded twisted pair cable 5. The first RS485 / RS422 transceiver 20 converts the RS485 signal into a TTL signal and transmits it to device 1 through the SSI protocol, thus realizing long-distance communication between sensor 4 and device 1.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A long-range SSI sensor communication system, characterized in that, The device (1) is connected to a first conversion circuit (2) for converting TTL level signals to RS485 signals. The first conversion circuit (2) is connected to a transmission circuit. The transmission circuit is connected to a second conversion circuit (3) for converting TTL level signals to RS485 signals. The second conversion circuit (3) is connected to a sensor (4).

2. The long-range SSI sensor communication system according to claim 1, characterized in that, The device (1) is connected to the first conversion circuit (2) via the SSI protocol, and the sensor (4) is connected to the second conversion circuit (3) via the SSI protocol.

3. The long-range SSI sensor communication system according to claim 2, characterized in that, The first conversion circuit (2) includes a first RS485 / RS422 transceiver (20). The DI pin of the first RS485 / RS422 transceiver (20) is connected to the SCK pin of the device (1) via the SSI protocol. The Y port and Z port of the first RS485 / RS422 transceiver (20) are connected to the second conversion circuit (3) via a transmission circuit.

4. The long-range SSI sensor communication system according to claim 3, characterized in that, The second conversion circuit (3) includes a second RS485 / RS422 transceiver (30). The A port of the second RS485 / RS422 transceiver (30) is connected to the Y port of the first RS485 / RS422 transceiver (20) through a transmission circuit. The B port of the second RS485 / RS422 transceiver (30) is connected to the Z port of the first RS485 / RS422 transceiver (20) through a transmission circuit. The RO pin of the second RS485 / RS422 transceiver (30) is connected to the SCK pin of the sensor (4) through the SSI protocol.

5. A long-range SSI sensor communication system according to claim 4, characterized in that, The DO pin of the sensor (4) is connected to the DI pin of the second RS485 / RS422 transceiver (30) via the SSI protocol.

6. A long-range SSI sensor communication system according to claim 5, characterized in that, The Z port of the second RS485 / RS422 transceiver (30) is connected to the B port of the first RS485 / RS422 transceiver (20) through a transmission circuit, and the Y port of the second RS485 / RS422 transceiver (30) is connected to the A port of the first RS485 / RS422 transceiver (20) through a transmission circuit.

7. A long-range SSI sensor communication system according to claim 6, characterized in that, The RO pin of the first RS485 / RS422 transceiver (20) is connected to the DI pin of the device (1) via the SSI protocol.

8. A long-range SSI sensor communication system according to claim 4, characterized in that, The first RS485 / RS422 transceiver (20) and the second RS485 / RS422 transceiver (30) are LTC2852.

9. A long-range SSI sensor communication system according to claim 1, characterized in that, The transmission circuit includes a shielded twisted pair cable (5), and the first conversion circuit (2) and the second conversion circuit (3) transmit data through the shielded twisted pair cable (5).

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