Wireless transmission system based on RS422 serial port

Abstract

The utility model relates to the technical field of wireless communication, and discloses a wireless transmission system based on an RS422 serial port, which comprises a first serial port unit, a serial port-to-wireless unit, a wireless transceiving unit, a wireless-to-serial port unit and a second serial port unit. Serial port communication is carried out in a wireless mode, the wireless unvarnished transmission function of RS422 signals between devices is achieved, the wireless transmission requirement of multiple sets of RS422 signals between industrial control devices can be met, data unvarnished transmission is achieved, and the real-time performance is good.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology and discloses a wireless transmission system based on an RS422 serial port. Background Technology

[0002] Traditionally, data transmission between industrial control equipment in factories relies primarily on wired connections. However, the increasing complexity of factory environments presents challenges, such as difficulties in wiring. Therefore, wireless data communication between industrial control equipment has become a technological necessity, with RS422 serial communication being a common method. Currently, most RS422 serial communication solutions available in the industrial control market are single-channel RS422 wireless communications, which cannot meet the universal and general-purpose wireless transmission requirements. Utility Model Content

[0003] The purpose of this invention is to provide a wireless transmission system based on an RS422 serial port, which can realize the wireless transparent transmission of RS422 signals between devices, with good data transparency and real-time performance.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by this utility model is as follows:

[0005] A wireless transmission system based on an RS422 serial port includes:

[0006] The first serial port unit is used to receive RS422 transmission signals and convert RS422 transmission signals into first RS422 serial port signals.

[0007] A serial-to-wireless unit is used to convert RS422 serial signals into wireless signals that can be transmitted wirelessly at 433MHz.

[0008] A wireless transceiver unit, used to receive or transmit the wireless signal;

[0009] A wireless-to-serial unit is used to receive wireless signals transmitted by a wireless transceiver unit and convert the wireless signals into a second RS422 serial port signal.

[0010] The second serial port unit is used to receive the second RS422 serial port signal and convert the second RS422 serial port signal into the corresponding RS422 transmission signal.

[0011] Furthermore, there are eight of each of the first serial port unit and the second serial port unit, and each of the first serial port unit and the second serial port unit is connected to each other through a serial-to-wireless unit, a wireless transceiver unit and a wireless-to-serial unit.

[0012] Furthermore, the first serial port unit includes an RS422 device and two MAX485ED chips. The RS422 device includes a 442T- pin, a 442T+ pin, a 442R- pin, a 442R+ pin, a 3V3 pin, and a GND pin. One of the MAX485ED chips is connected to the 442T- pin and the 442T+ pin of the RS422 device and is used to convert the 442T- pin signal and the 442T+ pin signal into a serial port signal RX. The other MAX485ED chip is connected to the 442R- pin and the 442R+ pin of the RS422 device and is used to convert the 442R- pin signal and the 442R+ pin signal into a serial port signal TX.

[0013] Furthermore, the serial-to-wireless unit includes a control conversion chip U8, which is used to convert the serial port signals RX and TX into corresponding signals that can be transmitted wirelessly at 433MHz.

[0014] Furthermore, the wireless-to-serial unit includes a control conversion chip U17, which is used to convert the corresponding signal of the wireless 433MHz transmission into a second RS422 serial port signal containing RX and TX.

[0015] Furthermore, the second serial port unit includes an RS422 device and two MAX485ED chips. The RS422 device includes a 442T- pin, a 442T+ pin, a 442R- pin, a 442R+ pin, a 3V3 pin, and a GND pin. One of the MAX485ED chips is connected to the 442T- pin and the 442T+ pin of the RS422 device and is used to convert the serial port signal RX into the corresponding RS442 standard signal. The other MAX485ED chip is connected to the 442R- pin and the 442R+ pin of the RS422 device and is used to convert the serial port signal TX into the corresponding RS442 standard signal.

[0016] Furthermore, the wireless transceiver unit uses an ANT-433 antenna to receive and transmit the wireless signal.

[0017] Compared with the prior art, the beneficial effects of this utility model are: by adopting a wireless serial communication method, this utility model realizes the wireless transparent transmission function of RS422 signals between devices, which can meet the wireless transmission needs of multiple RS422 signals between industrial control equipment, with data transparent transmission and good real-time performance. Attached Figure Description

[0018] Figure 1 This is a block diagram of the wireless transmission system based on RS422 serial port in Example 1;

[0019] Figure 2This is a circuit diagram of the power supply unit for the transmitting end in Example 2;

[0020] Figure 3 This is a circuit diagram showing the conversion of the 422 signal into a serial port signal in Example 2.

[0021] Figure 4 This is a circuit diagram showing the communication between the first serial port unit and the corresponding second serial port unit in Example 2.

[0022] Figure 5 This is a circuit diagram showing the communication between the 8-channel first serial port unit and the corresponding second serial port unit in Example 2;

[0023] Figure 6 This is the circuit diagram of the serial-to-wireless unit in Example 2;

[0024] Figure 7 This is the circuit diagram of the 433MHz wireless transmission unit in Example 2;

[0025] Figure 8 This is a circuit diagram of the power supply unit for the receiving end in Example 2;

[0026] Figure 9 This is the circuit diagram of the 433MHz wireless receiving unit in Example 2;

[0027] Figure 10 This is the circuit diagram of the wireless-to-serial converter unit in Example 2;

[0028] Figure 11 This is a circuit diagram for converting serial port signals into 422 signals in Example 2. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0030] Example 1

[0031] See Figure 1 and Figure 4 A wireless transmission system based on an RS422 serial port includes:

[0032] The first serial port unit is used to receive RS422 transmission signals and convert RS422 transmission signals into first RS422 serial port signals.

[0033] A serial-to-wireless unit is used to convert RS422 serial signals into wireless signals that can be transmitted wirelessly at 433MHz.

[0034] A wireless transceiver unit, used to receive or transmit the wireless signal;

[0035] A wireless-to-serial unit is used to receive wireless signals transmitted by a wireless transceiver unit and convert the wireless signals into a second RS422 serial port signal.

[0036] The second serial port unit is used to receive the second RS422 serial port signal and convert the second RS422 serial port signal into the corresponding RS422 transmission signal.

[0037] In this embodiment, serial communication is performed wirelessly to achieve wireless transmission of RS422 signals between devices. This can meet the wireless transmission requirements of multiple RS422 signals between industrial control equipment, providing data transmission with good real-time performance.

[0038] In this embodiment, there are eight first serial port units and eight second serial port units. Each first serial port unit and one second serial port unit are connected via a serial-to-wireless unit, a wireless transceiver unit, and a wireless-to-serial unit. This can meet the wireless transmission requirements of multiple RS422 signals between industrial control equipment. The multiple RS422 serial port signal data are transmitted independently without interference, ensuring data transparency and good real-time performance, and has significant potential for widespread application.

[0039] Example 2

[0040] See Figures 2-11 A wireless transmission system based on RS422 serial port includes a transmitter integrated module and a receiver integrated module.

[0041] I. The internal structure of the sending end integrated module is as follows:

[0042] 1.1 Transmitter Power Supply Unit: 5V power supply, with an LDO converter chip U1 to convert 5V to 3.3V. The circuit structure is as follows... Figure 2 As shown, C1, C2, C3, and C4 are filter capacitors to ensure stable voltage without noise, R1 is a current-limiting resistor for circuit protection, and POWER1 is a power indicator light.

[0043] 1.2 First serial port unit: a total of 8 channels, taking one channel as an example, such as... Figure 3 , Figure 4 and Figure 5 As shown: U1_A is the interface for connecting to RS422 devices. Simply connect it accordingly. Overall, U5 and U9 convert the RS422 signal into serial port signals RX0 and TX0. Resistors R are current-limiting protection resistors, and TVS transient voltage suppressor diodes D4, D8, D12, D16, D20, and D24 provide voltage protection. F4, F8, F12, and F16 are fuses for circuit protection. Finally, in conjunction with chips U5 and U9, the RS422 signal is converted into serial port signals RX0 and TX0.

[0044] In this embodiment, the other first serial port units are the same as this one, and are connected to the corresponding RS422 devices, such as U1_A-U8_A.

[0045] 1.3 Serial-to-Wireless Unit: such as Figure 6 As shown, the control conversion chip U12 converts the 8 serial port signals RX and TX into corresponding signals suitable for wireless 433MHz transmission: 433_R0~433_R7 (see network node). C16 and C17 are crystal oscillator matching capacitors, the remaining capacitors are power supply filter capacitors, X1 is the relevant crystal oscillator, resistors R4 and R40 are current limiting protection resistors, and the LED is the power supply indicator for U12.

[0046] 1.4 433MHz Wireless Transmitter Unit: A total of 8 433MHz transmitter modules; such as Figure 7 As shown, 433_R0~R7 are the inputs, and ANT0-433~ANT7-433 are the corresponding outputs. The 433MHz wireless signal is transmitted to the receiving end through these eight antennas ANT0-433~ANT7-433.

[0047] II. The internal structure of the receiver integrated module is as follows:

[0048] The receiver integrated module circuit and the transmitter integrated module circuit are mirror images of each other, specifically including:

[0049] 2.1 Receiver power supply unit: Same as the transmitter power supply unit, it is also 5V to 3.3V, such as... Figure 8 As shown:

[0050] 2.2, 433MHz wireless receiver unit: such as Figure 9 As shown, the 8-channel antenna signals ANT0433 are processed by the chip to form corresponding 433-R signals, which are then sent to the wireless-to-serial port unit.

[0051] 2.3 Wireless to Serial Port Unit: such as Figure 10 As shown, after processing by U17, the wireless signal is converted into serial port signals RX and TX;

[0052] 4. The second serial port unit converts the serial port signal into an RS422 standard signal, U1_B to U7_B, as follows: Figure 11 As shown:

[0053] In this embodiment, groups A and B are integrated together to form an integrated module. The overall correspondence is that U1_A~U7_A corresponds to U1_B~U7_B. By aggregating and networking 8 RS422 communication devices, point-to-point transmission is used to physically integrate the 8 transmitting modules together, such as... Figure 5 This achieves the effect of aggregation before transmission.

[0054] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wireless transmission system based on an RS422 serial port, characterized in that, include: The first serial port unit is used to receive RS422 transmission signals and convert RS422 transmission signals into first RS422 serial port signals. A serial-to-wireless unit is used to convert RS422 serial signals into wireless signals that can be transmitted wirelessly at 433MHz. A wireless transceiver unit, used to receive or transmit the wireless signal; A wireless-to-serial unit is used to receive wireless signals transmitted by a wireless transceiver unit and convert the wireless signals into a second RS422 serial port signal. The second serial port unit is used to receive the second RS422 serial port signal and convert the second RS422 serial port signal into the corresponding RS422 transmission signal.

2. The wireless transmission system based on RS422 serial port according to claim 1, characterized in that, There are 8 first serial port units and 8 second serial port units. Each first serial port unit and one second serial port unit are connected to each other through a serial-to-wireless unit, a wireless transceiver unit and a wireless-to-serial unit.

3. The wireless transmission system based on RS422 serial port according to claim 1, characterized in that, The first serial port unit includes an RS422 device and two MAX485ED chips. The RS422 device includes a 442T- pin, a 442T+ pin, a 442R- pin, a 442R+ pin, a 3V3 pin, and a GND pin. One of the MAX485ED chips is connected to the 442T- and 442T+ pins of the RS422 device and is used to convert the 442T- and 442T+ pin signals into serial port signals RX. The other MAX485ED chip is connected to the 442R- and 442R+ pins of the RS422 device and is used to convert the 442R- and 442R+ pin signals into serial port signals TX.

4. The wireless transmission system based on RS422 serial port according to claim 2, characterized in that, The serial-to-wireless unit includes a control conversion chip U8, which is used to convert serial port signals RX and TX into corresponding signals that can be transmitted wirelessly at 433MHz.

5. The wireless transmission system based on RS422 serial port according to claim 2, characterized in that, The wireless-to-serial unit includes a control conversion chip U17, which is used to convert the corresponding signal transmitted wirelessly at 433MHz into a second RS422 serial port signal containing RX and TX.

6. The wireless transmission system based on RS422 serial port according to claim 2, characterized in that, The second serial port unit includes an RS422 device and two MAX485ED chips. The RS422 device includes a 442T- pin, a 442T+ pin, a 442R- pin, a 442R+ pin, a 3V3 pin, and a GND pin. One MAX485ED chip is connected to the 442T- and 442T+ pins of the RS422 device and is used to convert the serial port signal RX into the corresponding RS442 standard signal. The other MAX485ED chip is connected to the 442R- and 442R+ pins of the RS422 device and is used to convert the serial port signal TX into the corresponding RS442 standard signal.

7. The wireless transmission system based on RS422 serial port according to claim 2, characterized in that, The wireless transceiver unit uses an ANT-433 antenna to receive and transmit the wireless signals.

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