CN112181884A - Data transmission device and data transmission system - Google Patents

Data transmission device and data transmission system Download PDF

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Publication number
CN112181884A
CN112181884A CN202011152405.9A CN202011152405A CN112181884A CN 112181884 A CN112181884 A CN 112181884A CN 202011152405 A CN202011152405 A CN 202011152405A CN 112181884 A CN112181884 A CN 112181884A
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interface
parallel port
data
signal
data transmission
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刘阳
丁岩
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East China Normal University
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East China Normal University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Information Transfer Systems (AREA)

Abstract

The invention provides a data transmission device and a data transmission system, comprising: the interface conversion chip receives a USB signal sent by the upper computer, converts the USB signal into a UART signal and further sends the UART signal to the processing chip; the processing chip changes the parallel port characteristic of the DB25 interface according to the UART signal so as to enable data communication between the upper computer and the parallel port equipment through the data transmission device, or converts data to be transmitted in the UART signal into target data so as to send the target data to the parallel port equipment through the DB25 interface, wherein the target data is data which accords with the current parallel port characteristic of the DB25 interface. The invention can change the parallel port characteristic of the DB25 interface through the upper computer, so that the data communication between the upper computer and the parallel port equipment is realized, namely the parallel port characteristic of the DB25 interface in the data transmission device is adjustable, so that the data transmission device can be adaptively connected with various parallel port equipment, and the universality is good.

Description

Data transmission device and data transmission system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission apparatus and a data transmission system.
Background
The parallel port is a data communication interface defined by IEEE1284 standard, in which data simultaneously transfers each data bit in units of bytes. In the IEEE1284 Standard, a plurality of Parallel interface data transmission modes are defined, wherein a basic mode is a Standard Parallel Port, which is called as an SPP mode for short. The connector used in the parallel port is defined in IEEE1284 that a DB25 connector is used at the host side, fig. 1 shows the outline and signal description of the DB25 connector, and when the parallel port transmits data using the SPP mode, the signal timing relationship is as shown in fig. 2.
In recent years, as the upgrading and upgrading of personal computer products are developed towards the direction of light and thin, the DB25 parallel port on the traditional personal computer has been gradually eliminated and replaced by a USB-parallel port patch cord. The user needs to connect the personal computer and the parallel interface equipment through the USB-parallel interface patch cord, and install a patch cord matched drive on the personal computer.
However, since the USB-parallel interface patch cord can be used only for parallel interface devices conforming to IEEE1284, it is impossible to perform data communication with a non-printer-type dedicated parallel interface device using such a cable. For the special parallel interface equipment of non-printer type, the user needs to purchase the special parallel interface switching device of the equipment manufacturer to realize the communication with the equipment. The special parallel port switching device is often expensive, and the special parallel port switching device of different equipment manufacturers cannot be used universally, so that the universality is poor.
In summary, the conventional dedicated parallel port switching device for data transmission has a technical problem of poor universality.
Disclosure of Invention
In view of the above, the present invention provides a data transmission device and a data transmission system to alleviate the technical problem of poor universality of the existing dedicated parallel port adapter device for data transmission.
In a first aspect, an embodiment of the present invention provides a data transmission apparatus, including: the interface conversion chip, the processing chip and the DB25 interface;
one end of the interface conversion chip is connected with an upper computer through a USB interface, the other end of the interface conversion chip is connected with one end of the processing chip, the other end of the processing chip is connected with one end of the DB25 interface, and the other end of the DB25 interface is connected with parallel port equipment;
the interface conversion chip is used for receiving a USB signal sent by the upper computer, converting the USB signal into a UART signal and further sending the UART signal to the processing chip through a signal transmission channel;
the processing chip is used for changing the parallel port characteristic of the DB25 interface according to the UART signal, or converting data to be transmitted in the UART signal into target data so as to send the target data to the parallel port equipment through the DB25 interface, wherein the target data is data which conforms to the current parallel port characteristic of the DB25 interface.
Further, the interface conversion chip includes: a USB-UART conversion chip;
the USB-UART conversion chip is used for receiving a USB signal sent by the upper computer, converting the USB signal into the UART signal and further sending the UART signal to the processing chip through a target signal transmission channel;
when the information in the UART signal is configuration information, the target signal transmission channel is a configuration information transmission channel; and when the information in the UART signal is data to be transmitted, the target signal transmission channel is a data transmission channel.
Further, the processing chip comprises: the interface configuration circuit and the data conversion circuit;
the interface configuration circuit is connected with the USB-UART conversion chip through the configuration information transmission channel;
the data forwarding circuit is connected with the USB-UART conversion chip through the data transmission channel.
Further, the parallel port characteristics include: the corresponding relation between the data bit and the DB25 pin bit and the width of the data latch signal pulse.
Further, the processing chip comprises: and (3) an FPGA chip.
Further, the method also comprises the following steps: a housing;
the interface conversion chip, the processing chip and the DB25 interface are disposed within the housing.
Further, the DB25 interface includes at least one of: male DB25 interface and female DB25 interface.
In a second aspect, an embodiment of the present invention further provides a data transmission system, including: the data transmission device according to any one of the first aspect, further comprising: an upper computer and a parallel port device;
the upper computer is connected with the parallel port equipment through the data transmission device, so that data communication between the upper computer and the parallel port equipment is realized through the data transmission device.
Further, the upper computer includes: a computer.
Furthermore, parallel port characteristic configuration software is arranged on the upper computer.
In an embodiment of the present invention, the data transmission apparatus includes: the interface conversion chip, the processing chip and the DB25 interface; one end of the interface conversion chip is connected with the upper computer through a USB interface, the other end of the interface conversion chip is connected with one end of the processing chip, the other end of the processing chip is connected with one end of the DB25 interface, and the other end of the DB25 interface is connected with the parallel port equipment; the interface conversion chip is used for receiving a USB signal sent by the upper computer, converting the USB signal into a UART signal and further sending the UART signal to the processing chip; the processing chip is used for changing the parallel port characteristic of the DB25 interface according to the UART signal so as to enable the upper computer and the parallel port equipment to realize data communication through the data transmission device, or converting data to be transmitted in the UART signal into target data so as to send the target data to the parallel port equipment through the DB25 interface, wherein the target data is data which is consistent with the current parallel port characteristic of the DB25 interface. It can be known from the above description that, in the data transmission device of the present invention, the parallel port characteristic of the DB25 interface can be changed by the upper computer, so that data communication between the upper computer and the parallel port device is realized through the data transmission device, that is, the parallel port characteristic of the DB25 interface in the data transmission device is adjustable, so that the data transmission device can be adaptively connected to various parallel port devices, and has good universality, thereby alleviating the technical problem of poor universality of the existing dedicated parallel port switching device for data transmission.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of the outline and signal description of a DB25 connector provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of the signal timing relationship of the DB25 connector according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;
fig. 4 is another schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a processing chip and a DB25 interface according to an embodiment of the present invention.
Icon: 11-interface conversion chip; 12-processing the chip; a 13-DB25 interface; 121-interface configuration circuitry; 122-data forwarding circuitry.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of understanding the embodiment, a detailed description will be given to a data transmission device disclosed in the embodiment of the present invention.
The first embodiment is as follows:
fig. 3 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention, and as shown in fig. 3, the data transmission apparatus includes: an interface conversion chip 11, a processing chip 12 and a DB25 interface 13;
one end of the interface conversion chip 11 is connected with an upper computer through a USB interface, the other end of the interface conversion chip 11 is connected with one end of the processing chip 12, the other end of the processing chip 12 is connected with one end of the DB25 interface 13, and the other end of the DB25 interface 13 is connected with parallel port equipment;
the interface conversion chip 11 is used for receiving a USB signal sent by the upper computer, converting the USB signal into a UART signal, and further sending the UART signal to the processing chip 12;
the processing chip 12 is configured to change a parallel port characteristic of the DB25 interface 13 according to the UART signal, so as to enable data communication between the upper computer and the parallel port device through the data transmission apparatus, or convert data to be transmitted in the UART signal into target data, so as to send the target data to the parallel port device through the DB25 interface 13, where the target data is data that matches the current parallel port characteristic of the DB25 interface 13.
In an optional embodiment of the present invention, when the interface conversion chip 11 of the data transmission apparatus is connected to a USB interface of an upper computer, and after the DB25 interface 13 of the data transmission apparatus is connected to a parallel port device, the processing chip 12 may identify a parallel port characteristic of the parallel port device through the DB25 interface 13, and further send the identified parallel port characteristic to the upper computer through the interface conversion chip 11, parallel port characteristic configuration software is installed in the upper computer, and if the identified parallel port characteristic is a parallel port characteristic stored in advance, the parallel port characteristic configuration software in the upper computer directly sends a USB signal carrying configuration information corresponding to the parallel port characteristic to the interface conversion chip 11 through the USB interface, and further the interface conversion chip 11 receives a UART signal sent by the upper computer, and converts the USB signal into a UART signal, and further sends the UART signal to the processing chip 12, so that the processing chip 12 changes the parallel port characteristic of the DB25 interface 13 according to the UART signal, further realizing data communication between the upper computer and the parallel port equipment;
in another optional embodiment of the present invention, after the interface conversion chip 11 of the data transmission device is connected to the USB interface of the upper computer, and after the DB25 interface 13 of the data transmission device is connected to the parallel port device, if the processing chip 12 does not recognize the parallel port characteristics of the parallel port device, the parallel port characteristics may be programmed by parallel port characteristic configuration software in the upper computer, so-called programming may be to set the following parallel port characteristics in the parallel port characteristic configuration software: the data communication method comprises the steps that the corresponding relation between a data bit and a DB25 pin bit and the width of a data latch signal pulse are achieved, then an upper computer sends programming information containing parallel port characteristics to an interface conversion chip 11 through a USB interface, the interface conversion chip 11 receives USB signals sent by the upper computer and converts the USB signals into UART signals, and then the UART signals are sent to a processing chip 12, so that the processing chip 12 changes the parallel port characteristics of a DB25 interface 13 according to the UART signals, and data communication is achieved between the upper computer and parallel port equipment;
if the configuration of the parallel port characteristic is completed, when data transmission is performed between the upper computer and the parallel port device, the upper computer sends a USB signal carrying data to be transmitted to the interface conversion chip 11 through the USB interface, and then the interface conversion chip 11 receives the USB signal sent by the upper computer, and converts the USB signal into a UART signal, and then sends the UART signal to the processing chip 12, so that the processing chip 12 converts the data to be transmitted in the UART signal into target data, and sends the target data to the parallel port device through the DB25 interface 13, and the target data is data conforming to the current parallel port characteristic of the DB25 interface 13.
The parallel port characteristics include: the corresponding relation between the data bit and the DB25 pin bit and the width of the data latch signal pulse.
In an embodiment of the present invention, the data transmission apparatus includes: an interface conversion chip 11, a processing chip 12 and a DB25 interface 13; one end of the interface conversion chip 11 is connected with an upper computer through a USB interface, the other end of the interface conversion chip 11 is connected with one end of the processing chip 12, the other end of the processing chip 12 is connected with one end of the DB25 interface 13, and the other end of the DB25 interface 13 is connected with parallel port equipment; the interface conversion chip 11 is used for receiving a USB signal sent by the upper computer, converting the USB signal into a UART signal, and further sending the UART signal to the processing chip 12; the processing chip 12 is configured to change a parallel port characteristic of the DB25 interface 13 according to the UART signal, so as to enable data communication between the upper computer and the parallel port device through the data transmission apparatus, or convert data to be transmitted in the UART signal into target data, so as to send the target data to the parallel port device through the DB25 interface 13, where the target data is data that matches the current parallel port characteristic of the DB25 interface 13. It can be known from the above description that, in the data transmission device of the present invention, the parallel port characteristic of the DB25 interface 13 can be changed by the upper computer, so that the data communication between the upper computer and the parallel port device is realized through the data transmission device, that is, the parallel port characteristic of the DB25 interface 13 in the data transmission device is adjustable, so that the data transmission device can be adaptively connected to various parallel port devices, and the present special parallel port switching device for data transmission has good universality, and the technical problem of poor universality of the present special parallel port switching device for data transmission is alleviated.
The foregoing has outlined the data transfer device of the present invention and the details thereof are set forth in the following description.
In an alternative embodiment of the present invention, referring to fig. 4, the interface conversion chip 11 includes: a USB-UART conversion chip;
the USB-UART conversion chip is used for receiving a USB signal sent by the upper computer, converting the USB signal into a UART signal and further sending the UART signal to the processing chip 12 through a target signal transmission channel;
when the information in the UART signal is configuration information, the target signal transmission channel is a configuration information transmission channel; when the information in the UART signal is data to be transmitted, the target signal transmission channel is a data transmission channel.
Specifically, the interface conversion chip 11 may be a universal USB-UART conversion chip, which realizes the conversion from the USB interface at the upper computer end to the UART interfaces of the two LVTTL levels, the UART1 is used for data transmission, that is, the data transmission channel, and the UART2 is used for transmission of configuration information, that is, the configuration information transmission channel.
In an alternative embodiment of the present invention, referring to fig. 4, the processing chip 12 includes: interface configuration circuit 121 and data forwarding circuit 122;
the interface configuration circuit 121 is connected with the USB-UART conversion chip through a configuration information transmission channel;
the data forwarding circuit 122 is connected to the USB-UART conversion chip through a data transmission channel.
Specifically, the interface configuration circuit 121 receives the UART signal including the parallel port characteristic information through the configuration information transmission channel, and dynamically changes the parallel port characteristic of the DB25 interface 13 after analyzing the UART signal. The data forwarding circuit 122 receives the UART signal containing the data to be transmitted through the data transmission channel, converts the data to be transmitted in the UART signal into target data in accordance with the current parallel port characteristic of the DB25 interface 13, and sends the target data to the parallel port device through the DB25 interface 13.
In an alternative embodiment of the invention, the processing chip 12 comprises: and (3) an FPGA chip. A schematic diagram of the circuit structure of the processing chip 12 and the DB25 interface 13 is given in fig. 5.
In an alternative embodiment of the present invention, the DB25 interface 13 includes at least one of: male DB25 interface 13 and female DB25 interface 13.
In an optional embodiment of the invention, the data transmission apparatus further comprises: a housing;
the interface conversion chip 11, the processing chip 12 and the DB25 interface 13 are disposed within the housing.
The data transmission device can be adapted to various non-universal parallel port equipment, has good universality and saves the use cost of users.
Example two:
an embodiment of the present invention further provides a data transmission system, where the data transmission system includes the data transmission device in the first embodiment, and further includes: an upper computer and a parallel port device;
the upper computer is connected with the parallel port equipment through the data transmission device, so that data communication between the upper computer and the parallel port equipment is realized through the data transmission device.
In an optional embodiment of the invention, the upper computer comprises: a computer. And the upper computer is provided with parallel port characteristic configuration software.
An example of the data arrangement for different vendor-specific parallel port devices is given in the following table:
Figure BDA0002740699970000091
the parallel port characteristics of three different special parallel port devices are given in the table above, and there are three data bit corresponding relations and three optimal data latch pulse widths. As shown in the above table, in the prior art, when a user needs to communicate with dedicated parallel port devices of three manufacturers, i.e., a/B/C, through a USB interface of a computer, three dedicated USB-parallel port conversion devices need to be purchased, otherwise, all bytes are transmitted incorrectly during data transmission.
After the data transmission device is used, one end of the data transmission device is connected with a USB interface of an upper computer, the other end of the data transmission device is connected with a DB25 interface of parallel port equipment, matched parallel port characteristic configuration software is arranged in the upper computer, the corresponding relation between a data bit and a DB25 pin bit (for example, the corresponding relation can be set according to the bit corresponding relation in the upper table) and the width of a data latch signal pulse (for example, the width can be set according to the optimal data latch signal pulse width in the upper table) can be set in parallel port characteristic configuration software, the parallel port characteristic is programmed and then is sent to the data transmission device through the USB interface, the data transmission device can dynamically adjust the parallel port characteristic of the DB25 interface according to programming information, and the data transmission device can be adapted to various non-universal parallel port equipment.
The computer program product of the data transmission apparatus provided in the embodiment of the present invention includes a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, which is not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A data transmission apparatus, comprising: the interface conversion chip, the processing chip and the DB25 interface;
one end of the interface conversion chip is connected with an upper computer through a USB interface, the other end of the interface conversion chip is connected with one end of the processing chip, the other end of the processing chip is connected with one end of the DB25 interface, and the other end of the DB25 interface is connected with parallel port equipment;
the interface conversion chip is used for receiving a USB signal sent by the upper computer, converting the USB signal into a UART signal and further sending the UART signal to the processing chip;
the processing chip is used for changing the parallel port characteristic of the DB25 interface according to the UART signal so as to enable the upper computer and the parallel port equipment to realize data communication through the data transmission device, or converting data to be transmitted in the UART signal into target data so as to send the target data to the parallel port equipment through the DB25 interface, wherein the target data is data which conforms to the current parallel port characteristic of the DB25 interface.
2. The apparatus of claim 1, wherein the interface conversion chip comprises: a USB-UART conversion chip;
the USB-UART conversion chip is used for receiving a USB signal sent by the upper computer, converting the USB signal into the UART signal and further sending the UART signal to the processing chip through a target signal transmission channel;
when the information in the UART signal is configuration information, the target signal transmission channel is a configuration information transmission channel; and when the information in the UART signal is data to be transmitted, the target signal transmission channel is a data transmission channel.
3. The apparatus of claim 2, wherein the processing chip comprises: the interface configuration circuit and the data conversion circuit;
the interface configuration circuit is connected with the USB-UART conversion chip through the configuration information transmission channel;
the data forwarding circuit is connected with the USB-UART conversion chip through the data transmission channel.
4. The apparatus of claim 1, wherein the parallel port characteristic comprises: the corresponding relation between the data bit and the DB25 pin bit and the width of the data latch signal pulse.
5. The apparatus of claim 1, wherein the processing chip comprises: and (3) an FPGA chip.
6. The apparatus of claim 1, further comprising: a housing;
the interface conversion chip, the processing chip and the DB25 interface are disposed within the housing.
7. The apparatus of claim 1, wherein the DB25 interface comprises at least one of: male DB25 interface and female DB25 interface.
8. A data transmission system, comprising: the data transmission apparatus of any of the preceding claims 1 to 7, further comprising: an upper computer and a parallel port device;
the upper computer is connected with the parallel port equipment through the data transmission device, so that data communication between the upper computer and the parallel port equipment is realized through the data transmission device.
9. The system of claim 8, wherein the upper computer comprises: a computer.
10. The system according to claim 8, wherein parallel port characteristic configuration software is arranged on the upper computer.
CN202011152405.9A 2020-10-23 2020-10-23 Data transmission device and data transmission system Pending CN112181884A (en)

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