CN212061145U - USB-COM port conversion circuit and industrial control equipment - Google Patents
USB-COM port conversion circuit and industrial control equipment Download PDFInfo
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- CN212061145U CN212061145U CN202020860620.3U CN202020860620U CN212061145U CN 212061145 U CN212061145 U CN 212061145U CN 202020860620 U CN202020860620 U CN 202020860620U CN 212061145 U CN212061145 U CN 212061145U
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Abstract
The utility model discloses a USB changes COM mouth circuit, including USB signal input module, PL2303RA chip and COM signal output module, the USB signal input module is connected to the signal input part of PL2303RA chip, and the COM signal output module is connected to the signal output part of PL2303RA chip, and PL2303RA chip will be from the USB signal input module received USB signal conversion to full-duplex asynchronous serial data signal through COM signal output module output. The utility model discloses still disclose an industry control equipment. The utility model discloses simplified circuit structure, circuit design is simpler, convenient debugging, and the cost is lower.
Description
Technical Field
The utility model relates to the field of communication technology, in particular to USB changes COM mouth circuit and industry control equipment.
Background
At present, industrial control equipment with a Cherry Rail-Z8350 chip adopted by a processor is more and more, the Cherry Rail-Z8350 chip does not have a full-function serial communication port (namely a COM port), and the industrial control equipment often needs to transmit information through the COM port; for example, an external device such as a printer is connected via a COM port to record data information to be printed and retained. Therefore, a circuit from USB to COM port is required in such industrial control equipment.
The existing USB to COM port circuit generally converts a USB signal into a serial data signal by using a signal conversion module, and then adds an RS232 transceiver specified by CCITT v.28 communication interface to match the level requirement of an external device, and outputs the serial data signal to the external device. The scheme has high cost, complex circuit and high requirement on the circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a USB changes COM mouth circuit and industry control equipment aims at simplifying the structure that USB changes COM mouth circuit, reduce cost and circuit requirement.
In order to achieve the above object, the utility model provides a USB changes COM mouth circuit, including USB signal input module, PL2303RA chip and COM signal output module, the signal input part of PL2303RA chip connects the USB signal input module, the signal output part of PL2303RA chip connects the COM signal output module, the PL2303RA chip will be received from the USB signal input module USB signal conversion to full-duplex asynchronous serial data signal and export through the COM signal output module.
Preferably, the USB to COM port circuit further comprises a power filter module connected to the PL2303RA chip.
Preferably, the USB to COM port circuit further comprises an electrostatic protection module, and the electrostatic protection module is connected between the output end of the PL2303RA chip and the COM signal output module.
Preferably, the COM signal output module is a D-SUB 9P interface.
The utility model also provides an industrial control equipment, change COM mouth circuit including USB, USB changes COM mouth circuit includes USB signal input module, PL2303RA chip and COM signal output module, the signal input part of PL2303RA chip connects the USB signal input module, the signal output part of PL2303RA chip connects COM signal output module, PL2303RA chip will be followed USB signal conversion that USB signal input module received is full-duplex asynchronous serial data signal warp COM signal output module output.
The utility model discloses technical scheme has just realized the transmission that USB signal changes serial data signal and serial data signal through adopting single PL2303RA chip, does not need plus the USB that level shift circuit just can realize one and changes COM mouth function, has simplified circuit structure, and circuit design is simpler, convenient debugging, and the cost is lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a circuit module structure diagram of the preferred embodiment of the USB to COM port circuit of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The utility model provides a USB changes COM mouth circuit, this USB changes COM mouth circuit can be applied to industrial computer, POS machine, vending machine, all-in-one computer, little box etc. and need COM port carry out data transmission's equipment.
Referring to fig. 1, the USB to COM port circuit of this embodiment includes a USB signal input module, a PL2303RA chip 20 and a COM signal output module 30, wherein a signal input terminal 21 of the PL2303RA chip 20 is connected to the USB signal input module 10, a signal output terminal 22 of the PL2303RA chip 20 is connected to the COM signal output module 30, and the PL2303RA chip 20 converts a USB signal received from the USB signal input module 10 into a full-duplex asynchronous serial data signal and outputs the full-duplex asynchronous serial data signal through the COM signal output module 30. In this embodiment, the COM signal output module 30 preferably adopts a D-SUB 9P interface; the USB signal input module 10 may be a USB1.1, USB2.0 or USB3.0 interface input circuit.
In this embodiment, the PL2303RA chip 20 incorporates a high baud rate RS232 transceiver that conforms to the EIA/TIA-232F and CCITT V.28 communication interface specifications. The RS-232 transceiver is a device embedded with a high-efficiency charge pump circuit with 3 transmitters and 5 receivers, the high-efficiency charge pump circuit and an external capacitor of 1uF can provide bipolar levels to a transmitting end, and the transmitter can provide RS232 level voltage output, and the RS-232 transceiver is a standard RS232 transceiver of a communication interface specification; under normal operating conditions, the PL2303RA chip 20 consumes very little power and guarantees data transfer rates up to 1000 kbps. Secondly, the PL2303RA chip 20 is also integrated with a high-baud rate conversion circuit which accords with EIA/TIA-232F; by utilizing USB block transfer mode, with large data buffers and automatic flow control, the PL2303RA chip 20 can achieve higher throughput ports than conventional universal asynchronous receiver/transmitter (uart), and the programmable baud rate that the PL2303RA chip 20 can provide can be anywhere from 75bps to 1M.
The PL2303RA chip 20 further has an indication pin SHTDN _ N with active low for indicating the shutdown of a specific application, and the RS232 transceiver can be controlled to shut down by signaling the indication pin SHTDN _ N low.
The working process of the circuit for converting the USB to the COM port in the embodiment is as follows: the USB device inputs the USB signal to the input pins 12 and 13 of the PL2303RA chip 20 through the USB signal input module 10, converts the USB signal into a serial data signal through the high-bitrate conversion circuit EIA/TIA-232F in the PL2303RA chip 20, and then outputs the serial data signal to the COM signal output module 30 through the RS232 transceiver of the CCITT v.28 communication interface specification in the PL2303RA chip 20, so that the serial data signal is output from the COM signal output module 30 to the external device.
Compared with the prior art, the USB-to-COM port circuit can realize the function of converting USB to COM port one by one without adding a level conversion circuit, simplifies the circuit structure, and has simpler circuit design, convenient debugging and lower cost.
Further, the USB to COM port circuit of this embodiment further includes a power filter module 40 connected to the PL2303RA chip 20, and configured to filter the power supply of the PL2303RA chip 20, so as to prevent the power supply of the PL2303RA chip 20 from being interfered.
Further, the USB to COM port circuit of this embodiment further includes an electrostatic protection module 50, where the electrostatic protection module 50 is connected between the output terminal of the PL2303RA chip 20 and the COM signal output module 30, so as to improve protection of the circuit against static electricity generated by current discharge of a contact resistor during power-on, and the scheme of the electrostatic protection module 50 may be, for example, that a voltage regulator is connected to ground at each connection pin between the COM signal output module 30 and the signal output terminal 22 of the PL2303RA chip 20.
The utility model also provides an industrial control equipment, change COM mouth circuit including USB, this USB changes COM mouth circuit's concrete structure refers to above-mentioned embodiment, because industrial control equipment has originally adopted the whole technical scheme of above-mentioned embodiment, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, does not do here and give unnecessary detail.
The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (5)
1. A circuit for converting a USB signal into a COM port is characterized by comprising a USB signal input module, a PL2303RA chip and a COM signal output module, wherein the signal input end of the PL2303RA chip is connected with the USB signal input module, the signal output end of the PL2303RA chip is connected with the COM signal output module, and the PL2303RA chip converts a USB signal received from the USB signal input module into a full-duplex asynchronous serial data signal and outputs the full-duplex asynchronous serial data signal through the COM signal output module.
2. A USB to COM port circuit according to claim 1, further comprising a power filter module connected to the PL2303RA chip.
3. A USB to COM port circuit according to claim 1 or 2, further comprising an electrostatic protection block connected between the output of the PL2303RA chip and the COM signal output block.
4. A circuit from USB to COM port according to claim 1 or 2, wherein the COM signal output module is a D-SUB 9P interface.
5. An industrial control device, characterized in that the industrial control device comprises a circuit from USB to COM port according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020860620.3U CN212061145U (en) | 2020-05-21 | 2020-05-21 | USB-COM port conversion circuit and industrial control equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020860620.3U CN212061145U (en) | 2020-05-21 | 2020-05-21 | USB-COM port conversion circuit and industrial control equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212061145U true CN212061145U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020860620.3U Active CN212061145U (en) | 2020-05-21 | 2020-05-21 | USB-COM port conversion circuit and industrial control equipment |
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| Country | Link |
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| CN (1) | CN212061145U (en) |
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2020
- 2020-05-21 CN CN202020860620.3U patent/CN212061145U/en active Active
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