CN220122928U - USB changes RS485 four-way communication converter - Google Patents

Abstract

The utility model discloses a USB-to-RS 485 four-channel communication converter which comprises a converter main body, a power adapter, a USB connecting wire, a 1-to-4 serial port connecting wire, a computer and a test conversion port, wherein the power adapter, the USB connecting wire, the 1-to-4 serial port connecting wire and the computer are connected with the converter main body, a transverse radiating groove structure is arranged on the front surface and the rear surface of the converter main body, the inside of the radiating groove is directly contacted with a PCB main board, the front surface of the PCB main board is clamped into a clamping groove on the lower part in a shell, the PCB main board comprises a singlechip module, a power module, a signal indicating lamp module, a 485 communication module and a power isolation module, the 485 communication module is connected to the singlechip module through the serial port module, and 4 channels of the chip in the singlechip chip collocation 485 communication module are used for completing a 1-channel USB-to-4-channel 485 communication framework. The device can be used for rapidly and conveniently connecting the computer with the intelligent electric energy meter for communication, improves the production test efficiency, simultaneously has good portability, and has higher utilization rate of equipment.

Description

USB changes RS485 four-way communication converter

Technical Field

The utility model relates to the technical field of communication converters, in particular to a USB-to-RS 485 four-channel communication converter.

Background

With the continuous development of national economy, electric power has become the most important energy source of the country. In the case of civil power, the quality of life is rapidly improved due to the great abundance of people's physical lives, and the demand for power is also increasing. Meanwhile, with the rapid development of social informatization and networking degree, the intelligent electric energy meter is promoted to enter a high-speed technology updating development stage by the proposal of the intelligent power grid concept. At present, the architecture of a remote automatic meter reading system is primarily completed in a plurality of areas in China, but the manual meter reading mode is still used in a plurality of areas, the intelligent electric energy meter technology is rapidly developed, the intelligent electric power grid concept is put forward and popularized, and the intelligent electric energy meter can keep higher demand for a long time.

The intelligent electric energy meter at present has a plurality of communication modes such as 485, infrared, carrier wave, wireless module and the like, but the most reliable mode is still a wired 485 communication mode in terms of production test, and the mode has the characteristics of high communication speed, strong anti-interference capability and lower construction cost. Another device which is indispensable for production test is a computer, which usually sends commands to the intelligent meter for test through 485 communication by computer software, wherein the computer is required to be provided with an RS232 serial port card through a PCI or PCI-E expansion card slot on a main board, and then is finally connected to the intelligent electric energy meter or an electric energy meter test tool through a converter from RS232 to 485 for communication. On one hand, the serial port card is generally divided into three specifications of 1 drag 2, 1 drag 4 and 1 drag 8, and has more expansion ports and higher price, and on the other hand, the serial port card is directly inserted on a computing main board, so that the installation is inconvenient and the portability is poor.

Disclosure of Invention

According to the technical problem to be solved, the USB-to-RS 485 four-channel communication converter which is more suitable for production test, safe and reliable and convenient to install and transplant is provided.

In order to achieve the above purpose, the utility model discloses a USB-to-RS 485 four-channel communication converter, which comprises a converter main body, a power adapter, a USB connecting wire, a 1-to-4 serial port connecting wire and a test conversion port, wherein the power adapter, the USB connecting wire, the 1-to-4 serial port connecting wire and the test conversion port are connected with the converter main body, the front surface and the rear surface of the converter main body are provided with transverse radiating groove structures, the inside of the radiating groove is directly contacted with a PCB main board, the front surface of the PCB main board is clamped into a clamping groove at the lower part in a shell, four corners of the left side and the right side of the converter main body are respectively provided with four detachable panels for fixing the panels by screws, the middle of the left side panel is provided with a 44-pin serial port line slot of 1-to-4, 4 RS232 serial ports are separated from the right side panel of the converter main body by the 1-to-4 serial port connecting wire and are connected with test tools or 485 communication port equipment, the power supply interface is sequentially arranged on the right side panel of the converter main body from left to right side, the upper side and the lower side of the bottom surface of the converter main body is symmetrically connected with a 9V DC power adapter by the power supply interface, fixing edges are symmetrically extended.

Further, the power supply interface on the right side of the converter main body is connected with the power adapter, the USB interface is connected to the computer through a USB connecting wire, one side of the USB connecting wire is a common A-type USB male port, the other side of the USB connecting wire is a B-type USB male port and is used for accessing the B-type USB interface of the converter main body, the serial port line slot female head on the left side of the converter main body is connected to the serial port male head of the serial port connecting wire with the number of 1 to 4, the other side of the serial port connecting wire with the number of 1 to 4 is the serial port male heads of the number of 4 RS232, and the USB connecting wire is connected with the electric energy meter through a test conversion port.

Furthermore, the test conversion port is a simple communication device with a 485 receiving port and a 485 transmitting port respectively connected with the RS232 port.

Still further, PCB mainboard includes singlechip module, power module, signal indication lamp module, 485 communication module and power isolation module, 485 communication module passes through serial ports module and is connected to the singlechip module, and 4 way 485 channels that the chip in singlechip chip collocation 485 communication module was built accomplish 1 way USB and change 4 way 485's communication architecture.

Furthermore, the singlechip module is connected with the power supply module and the signal indicating lamp module, the 7 pins and the 8 pins of the singlechip chip are connected with the USB port, and the power supply input end of the singlechip module is connected with the self-recovery fuse in series.

Still further, be provided with communication chip in the 485 communication module, be provided with the protection circuit including at least three two-way transient suppression diode of group and a set of ceramic discharge tube between communication chip's 12 foot and 13 foot and the serial ports, wherein 12 foot is connected power isolation module through sixteenth resistance, and 13 foot is through thirteenth resistance ground connection setting, and 12 foot and 13 foot output are connected to the serial ports.

Still further, power module includes singlechip power supply circuit and auxiliary power supply circuit, and auxiliary power supply circuit is DC5V isolation voltage and is connected to 485 communication module with DV5V output through power isolation module, and singlechip power supply circuit connects power adapter and output 3.3V voltage, all is provided with the emitting diode subassembly in the power module.

Compared with the prior art, the utility model has the beneficial effects that: the structure is simple, safe and reliable; the device can be used for rapidly and conveniently connecting the computer with the intelligent electric energy meter for communication, so that the production test efficiency is improved; meanwhile, the device also has good portability, is used by plug and play, has higher utilization rate, can be more flexibly transferred to other devices for use, and can be connected with a notebook computer for use compared with the traditional mode depending on PCI or PCI-E, thereby improving the convenience and application range of 485 communication.

Drawings

The utility model will be described in further detail with reference to the drawings and the detailed description.

Fig. 1 is a schematic diagram of a connection relationship of a converter according to the present utility model.

Fig. 2 is a top view of the transducer of the present utility model.

Fig. 3 is a front view of the converter of the present utility model.

Fig. 4 is a left side view of the converter of the present utility model.

Fig. 5 is a right side view of the transducer of the present utility model.

FIG. 6 is a circuit diagram of a single chip module according to the present utility model.

Fig. 7 is a circuit diagram of a first channel in the communication module according to the present utility model.

Fig. 8 is a circuit diagram of a second channel in the communication module according to the present utility model.

Fig. 9 is a circuit diagram of a third channel in the communication module according to the present utility model.

Fig. 10 is a circuit diagram of a fourth channel in the communication module according to the present utility model.

FIG. 11 is a circuit diagram of a power supply of a single chip microcomputer according to the present utility model.

Fig. 12 is a diagram of an auxiliary power supply circuit of the present utility model.

FIG. 13 is a circuit diagram of a power isolation module according to a first embodiment of the present utility model.

FIG. 14 is a circuit diagram of a power isolation module of a second embodiment of the present utility model.

Fig. 15 is a circuit diagram of a power isolation module of a third embodiment of the present utility model.

FIG. 16 is a circuit diagram of a power isolation module of a fourth embodiment of the present utility model.

Fig. 17 is a circuit diagram of a signal indicator module according to the present utility model.

Fig. 18 is a serial circuit diagram of the present utility model.

In the figure: 1 is a converter body; 11 is a fixed hole; 12 is a heat dissipation groove; 13 is a serial port line slot; 14 is a USB interface; 15 is a data transmission indicator lamp; 16 is a power supply interface; 2 is a power adapter; 3 is a USB connecting wire; 4 is a serial port connecting line with 1 trailer 4; and 5 is a test conversion port.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In one embodiment of the utility model, as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the converter is composed of a converter main body, a 9V power adapter, a USB connection wire and a 1-to-4 serial connection wire, in addition, a computer is required to be equipped for testing the electric energy meter, a test conversion port is also required to be equipped according to circumstances, if a tooling with an RS232 interface with multiple epitopes is required, the conversion port is not required, the top surface of the converter main body is printed with the name, parameter information, LOGO and equipment number of the converter, the front and rear surfaces of the converter main body 1 are provided with transverse heat dissipation grooves 12, the shell is made of metal materials, has better heat conduction performance, the inside of the heat dissipation grooves 12 is in direct contact with a PCB main board, the heat dissipation is convenient and better, the stable operation of the converter can be ensured for a long time, the front surface of the PCB main board is clamped into a clamping groove below the shell, and is not required to be additionally fixed, four corners of the left side and the right side of the converter main body 1 are respectively provided with four detachable panels which are used for fixing the panels by screws, the detachable panel structure is convenient for the installation of a PCB mainboard, the middle of the left side panel is provided with 44-pin serial port line slots 13 for 1 to 4, 4 RS232 serial ports are separated by 1 to 4 serial port connecting lines 4 and are connected with test tools or 485 communication port equipment, the communication can be carried out with a computer, the left side of the panel is provided with a B-type USB interface which comprises corresponding indicator lamps, the red indicator lamps can be lightened after the USB connecting lines are connected, the computer and the converter can be connected through the USB connecting lines, the computer can be communicated with equipment connected with the RS232 serial ports at the other end, the middle is provided with 4-way 485 data transmission indicator lamps, 4 groups of 8 lamps are respectively TXD1, RXD1, TXD2, RXD2, TXD3, TXD4 and corresponding 4 groups 485 data receiving and transmitting, and when data exchange is carried out, the corresponding lamp can flash, the right side is the power supply interface of converter and power indicator lamp thereof, needs to insert 9V direct voltage's power adapter, inserts the power adapter back, and red pilot lamp can light, and the upper and lower bilateral symmetry of converter main part 1 bottom surface extends the fixed limit to with set up fixed orifices 11 on the fixed limit.

The power supply interface 16 on the right side of the converter body 1 is connected to the power adapter 2, and as a preferred embodiment of the present utility model, the connector of the power adapter is a DC straight plug, and the size is as follows: 5.5.2.1.10 (inner diameter and outer diameter and length), input voltage is 220V, output voltage is 9V, rated current can support the normal use of converter more than 0.5A, USB interface 14 is connected to the computer through USB connecting wire 3, USB connecting wire 3 one side is ordinary A type USB public port for the USB mouth of access computer, the opposite side is B type USB public port for the B type USB interface of access converter main part 1, the female head of serial port line slot 13 on the left side of converter main part 1 is connected to 1 and drags 4 serial port public heads of serial port connecting wire 4, 1 drags 4 serial port public heads of 4 opposite side of serial port connecting wire 4 is 4 RS232 serial ports, be connected with the electric energy meter through test conversion mouth 5.

The test conversion port 5 is a simple communication device with a 485 receiving port and a 485 transmitting port respectively connected with the RS232 port, and is simple in structure and convenient to replace and maintain.

The PCB main board comprises a singlechip module, a power supply module, a signal indicating lamp module, a 485 communication module and a power isolation module, wherein the PCB main board adopts an FT4232HL chip as a main chip of the converter, the data transceiving and protocol conversion of the chip are all independently completed by the chip, manual intervention is not needed, firmware of the chip is not needed to be written, the whole interface protocol is solidified in the chip, additional programming is not needed, in addition, 4 ADM2483 chips are used for completing a 1-way USB-4-way 485 communication architecture, compared with other common RS485 chips, the ADM2483 is safer and more reliable, the power consumption is lower, the transmission rate is higher, a reliable peripheral circuit is additionally arranged on the efficient and stable chip, so that the converter can bear the high-strength and long-time operation of production test, when the converter is connected with a computer, a computer device manager can find 4 new COM ports (the computer needs to be provided with the chip drive of FT4232HL in advance), and the device 485 connected with 4 RS232 serial ports at the other end of the converter can be used for communication in software. Because the converter is connected through the USB port, the converter can be plugged and shifted to other devices for use at any time, and it is noted that when the converter switches different USB ports of the computer, the port number is changed accordingly, and the converter is changed in the setting of test software in the shifting use process of the device.

The singlechip module is connected with the power module and the signal indicator module, the 7 pins and the 8 pins of the singlechip chip are connected with the USB port, the power input end of the singlechip module is connected with the 500mA self-recovery fuse in series, even if the power is short-circuited in the use process, the circuit can not be burnt out, and the singlechip chip can normally work after being disconnected and powered on again.

As shown in fig. 7 to 10, the above-mentioned drawings are circuit diagrams of communication modules of various channels, a communication chip is arranged in a 485 communication module, three sets of P6KE6.8CA bidirectional transient suppression diodes and a set of ceramic discharge tube protection circuits are arranged between a 12 pin and a 13 pin of the communication chip and a serial port, as lightning protection, the 485 interface can bear an alternating voltage 380V, wherein the 12 pin is connected with a power isolation module through a sixteenth resistor, the 13 pin is grounded through a thirteenth resistor, the output ends of the 12 pin and the 13 pin are connected to the serial port, the AC220V is converted into the DC5V, the DC5V is converted into a DC5V isolation power supply through the power isolation module, and the power supply voltage of the 485 communication module is isolated from the power supply voltage of the singlechip.

As shown in fig. 13 to 16, the above-mentioned figures are power isolation module circuit diagrams of each channel, the power module includes a single-chip microcomputer power supply circuit and an auxiliary power supply circuit, the auxiliary power supply circuit outputs DC5V as DC5V isolation voltage through the power isolation module and is connected to the 485 communication module, the single-chip microcomputer power supply circuit is connected with the power adapter and outputs 3.3V voltage, and the power module is internally provided with light emitting diode assemblies.

The USB-to-RS 485 four-channel communication converter is matched with a computer and a test conversion port for use, the computer needs to be provided with a USB interface (A type) with 2.0 or 3.0, a FT4232HL conversion chip is installed before the computer is used, the computer needs to be a windows system with a winXP or more, required hardware configuration meets software requirements for test use, after the converter is connected with the test conversion port through a 1-to-4 serial port connecting line, the other end of the test conversion port can be directly connected with an intelligent electric energy meter, then software can be communicated with the device through a corresponding COM port, and in addition, when the computer is in communication with electric energy, the baud rate on the software needs to be adjusted to be consistent with the electric energy meter.

The working principle of the embodiment is as follows: the 1-to-4 serial port connecting wire is inserted on the converter, and the serial ports of the 4 RS232 separated from the other end are connected with the test fixture or directly connected with equipment with 485 communication function through the test conversion port; the left side of the right panel of the converter is provided with a B-type USB interface which comprises a corresponding indicator lamp, the B-type USB interface is connected with a computer by a USB connecting wire, the red indicator lamp is lightened, the middle of the right panel is provided with 4 paths of 485 data transmission indicator lamps, and the total number of the 4 groups of 8 lamps is TXD1, RXD1, TXD2, RXD2, TXD3, RXD3, TXD4 and RXD4 respectively, and the corresponding 4 groups of 485 data are received and transmitted, and when data exchange is carried out, the corresponding lamps flash; the right side of the right panel is provided with a power supply interface of the converter and a power supply indicator lamp thereof, a power supply adapter connected with 9V direct-current voltage is connected, and a red indicator lamp is lighted up, so that the connection of the USB-to-RS 485 four-channel communication converter is completed. Opening an equipment manager of the computer to see whether a newly added COM port exists, and if not, checking whether a driver is installed; after the ports work normally, opening communication test software, configuring communication setting of the software, enabling the communication ports to correspond to the newly added ports of the computer one by one, and simultaneously adjusting the communication baud rate; the other end is connected with 485 communication equipment, whether 485 has polarity or not is required to be noted, if so, the polarity of 485 is required to be noted when the connection is performed; after the equipment and the software are debugged without errors, the communication test can be started, the software command is sent, the data is transmitted to the main body of the converter through the USB port and the USB connecting wire, the FT4232HL data conversion chip of the converter converts the data and then transmits the converted data to the 485 chip corresponding to one path for processing, then the converted data is transmitted to the corresponding RS232 port through the 1-to-4 serial connecting wire and finally transmitted to the equipment with 485 communication function of the terminal through the test conversion port, the equipment receives the data for processing and feeds back, the fed back data returns through the path, and finally the test result is displayed after the analysis of the software. In the testing process, the communication indicator lamp of the converter is observed, and when 485 corresponding to one path is communicated, the communication indicator lamp continuously flashes.

The points to be described are: first, in the description of the present utility model, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed; second, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The above examples are merely illustrative of the present utility model and are not meant to limit the scope of the present utility model, and all designs that are the same or similar to the present utility model are within the scope of the present utility model.

Claims (7)

1. The utility model provides a USB changes RS485 four-channel communication converter, includes converter main part (1), power adapter (2), USB connecting wire (3), 1 drags 4 serial ports connecting wire (4) and test conversion mouth (5) that are connected with converter main part (1), its characterized in that, both sides are provided with horizontal radiating groove (12) structure around converter main part (1), radiating groove (12) inside and PCB mainboard direct contact, in the draw-in groove of the below in the positive up joint casing of PCB mainboard, four corners that can dismantle panel are used for fixed panel all installed in four corners of converter main part (1) left and right sides, are provided with 4 44 needle serial ports line slots (13) that drag 4 in the middle of the left panel, drag 4 serial ports connecting wire (4) through 1 and divide 4 RS232 serial ports and test fixture or 485 communication mouth equipment to be connected, USB interface (14), data transmission pilot lamp (15) and 485 interface (16) have been set gradually from left to right on converter main part (1) right side panel, power supply interface (16) are connected 9V power adapter's bottom surface (2), the upper and lower side of converter (1) is equipped with fixed to open the side of the symmetry, and fixed both sides are equipped with fixed to the side (11).

2. The USB-to-RS 485 four-channel communication converter according to claim 1, characterized in that a power supply interface (16) on the right side of the converter main body (1) is connected with a power supply adapter (2), a USB interface (14) is connected to a computer through a USB connecting wire (3), one side of the USB connecting wire (3) is a common A-type USB male port, the other side of the USB connecting wire is a B-type USB male port for accessing the B-type USB interface of the converter main body (1), a serial port line slot (13) on the left side of the converter main body (1) is connected with a serial port male head of a serial port connecting wire (4) of 1 to 4, and the other side of the serial port connecting wire (4) of 1 to 4 is a serial port male head of 4 to 4 RS232 and is connected with an electric energy meter through a test conversion port (5).

3. A USB to RS485 four-way communication converter according to claim 2, characterized in that the test conversion port (5) is a simple communication device with 485 receiving port and 485 transmitting port connected with RS232 port respectively.

4. The USB-to-RS 485 four-channel communication converter according to claim 1, wherein the PCB main board comprises a single chip microcomputer module, a power supply module, a signal indicator lamp module, a 485 communication module and a power isolation module, wherein the 485 communication module is connected to the single chip microcomputer module through a serial port module, and a single chip microcomputer chip is matched with a 4-channel 485 channel built by a chip in the 485 communication module to complete a 1-channel USB-to-4-channel 485 communication architecture.

5. The USB-to-RS 485 four-channel communication converter according to claim 4, wherein the singlechip module is connected with the power module and the signal indicator module, 7 pins and 8 pins of the singlechip chip are connected with the USB port, and a power input end of the singlechip module is connected with a self-recovery fuse in series.

6. The USB to RS485 four channel communication converter according to claim 4, wherein a communication chip is disposed in the 485 communication module, a protection circuit including at least three sets of bidirectional transient suppression diodes and a set of ceramic discharge tubes is disposed between pins 12 and 13 of the communication chip and the serial port, wherein pin 12 is connected to the power isolation module through a sixteenth resistor, pin 13 is grounded through a thirteenth resistor, and output ends of pins 12 and 13 are connected to the serial port.

7. The USB-to-RS 485 four-channel communication converter according to claim 4, wherein the power supply module comprises a singlechip power supply circuit and an auxiliary power supply circuit, the auxiliary power supply circuit outputs DV5V as DC5V isolation voltage through the power isolation module and is connected to the 485 communication module, the singlechip power supply circuit is connected with the power adapter and outputs 3.3V voltage, and the power supply module is internally provided with light-emitting diode assemblies.