CN110866415A - Bar code equipment control method and system based on USB composite equipment - Google Patents
Bar code equipment control method and system based on USB composite equipment Download PDFInfo
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- CN110866415A CN110866415A CN201911129560.6A CN201911129560A CN110866415A CN 110866415 A CN110866415 A CN 110866415A CN 201911129560 A CN201911129560 A CN 201911129560A CN 110866415 A CN110866415 A CN 110866415A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1417—2D bar codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/146—Methods for optical code recognition the method including quality enhancement steps
- G06K7/1465—Methods for optical code recognition the method including quality enhancement steps using several successive scans of the optical code
Abstract
The invention relates to a bar code equipment control method based on USB composite equipment, which comprises the following steps: the bar code equipment is connected with the host through a USB interface; the bar code equipment sends a composite equipment descriptor to the host, wherein the composite equipment descriptor comprises a USB HID keyboard descriptor and a custom HID descriptor; the host generates an HID keyboard and a user-defined HID according to the composite device descriptor; the host sends a user-defined HID message to the bar code equipment through the user-defined HID equipment and receives the user-defined HID message from the bar code equipment through the user-defined HID equipment, wherein the user-defined HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or bar code decoding data. The invention also provides a bar code equipment control system based on the USB composite equipment. The invention realizes the data interaction between the bar code equipment and the host.
Description
Technical Field
The invention relates to a bar code device control method and system based on USB composite equipment, and belongs to the field of bar code devices.
Background
Referring to fig. 1, in the case that the existing barcode device uses a USB HID keyboard in a communication manner, only barcode data read and decoded by the barcode device can be sent from the device side to the host, and the host can only passively receive the decoded data, and cannot control the barcode device. This causes the following problems: 1. the host cannot reply to the bar code equipment after receiving the decoded data, so that the bar code equipment needs to repeatedly scan the code again for many times when data transmission is delayed or has errors; 2. whether the bar code equipment is normally connected with the host cannot be confirmed through the host; 3. when the type of the bar code identified by the bar code equipment is changed, the bar code equipment cannot be controlled by the host to switch the decoding library corresponding to the type of the bar code, so that the existing bar code equipment can only scan a single type of bar code and has large use limitation; 4. the opening and closing of the code scanning state cannot be controlled through the host, and false triggering is easily caused when the bar code equipment is in the continuous trigger code scanning state; 5. the product information and the firmware version of the bar code equipment can not be acquired, and if the bar code equipment has problems, the maintenance difficulty is high.
Disclosure of Invention
In order to solve the technical problem, the invention provides a barcode device control method based on a USB composite device, so that a host can control the barcode device and data interaction can be carried out between the barcode device and the host.
The first technical scheme of the invention is as follows:
a bar code equipment control method based on USB composite equipment comprises the following steps: the bar code equipment is connected with the host through a USB interface, and the bar code equipment sends a composite equipment descriptor to the host, wherein the composite equipment descriptor comprises a USB HID keyboard descriptor and a custom HID descriptor; the host generates an HID keyboard and a user-defined HID in a device manager of the host according to the composite device descriptor; the host sends a user-defined HID message to the bar code equipment through the user-defined HID equipment, and receives the user-defined HID message from the bar code equipment through the user-defined HID equipment, wherein the user-defined HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or decoding data of the bar code equipment on the bar code; the bar code equipment receives and analyzes the user-defined HID message to obtain a data field, and executes the operation corresponding to the data field to realize the control of the bar code equipment by the host; the bar code equipment also sends a user-defined HID message to the host computer, and transmits decoding data or replies to the parameter setting instruction through the user-defined HID message.
Preferably, the USB HID keyboard descriptor comprises a bar code device descriptor, a configuration descriptor, an interface descriptor I, an HID descriptor I, a report descriptor I and an endpoint descriptor I, and the custom HID device descriptor comprises an interface descriptor II, an HID descriptor II, a report descriptor II and an endpoint descriptor II.
More preferably, the parameter setting instruction includes a code scanning function enabling different barcodes, a start scanning instruction, an end scanning instruction, an ACK instruction for confirming that it has been received, a heartbeat instruction, a query instruction, an on/off instruction of a sound part on the barcode device, and an on/off instruction of a light emitting part.
Preferably, the bar code device sends the decoded data to the host after decoding the bar code, the host sends a custom HID message containing an ACK command indicating that the user has received the custom HID message to the bar code device through the custom HID device after receiving the decoded data, and if the bar code device does not receive the ACK command after sending the decoded data for more than a preset time, the bar code decoded data is automatically retransmitted.
The invention also provides a bar code equipment control system based on the USB composite equipment.
The second technical scheme of the invention is as follows:
a bar code device control system based on USB composite equipment comprises bar code equipment and a host, wherein the bar code color equipment is connected with the host through a USB, the bar code equipment sends composite equipment descriptors to the host, and the composite equipment descriptors comprise USB HID keyboard descriptors and custom HID equipment descriptors; the host generates an HID keyboard and a user-defined HID in a device manager of the host according to the composite device descriptor; the host sends a user-defined HID message to the bar code equipment through the user-defined HID equipment, and receives the user-defined HID message from the bar code equipment through the user-defined HID equipment, wherein the user-defined HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or decoding data of the bar code equipment on the bar code; the bar code equipment receives and analyzes the user-defined HID message to obtain a data field, and executes the operation corresponding to the data field to realize the control of the bar code equipment by the host; the bar code equipment also sends a user-defined HID message to the host computer, and transmits decoding data or replies to the parameter setting instruction through the user-defined HID message.
Preferably, the USB HID keyboard descriptor comprises a bar code device descriptor, a configuration descriptor, an interface descriptor I, an HID descriptor I, a report descriptor I and an endpoint descriptor I, and the custom HID device descriptor comprises an interface descriptor II, an HID descriptor II, a report descriptor II and an endpoint descriptor II.
More preferably, the parameter setting instruction includes a code scanning function enabling different barcodes, a start scanning instruction, an end scanning instruction, an ACK instruction for confirming that it has been received, a heartbeat instruction, a query instruction, an on/off instruction of a sound part on the barcode device, and an on/off instruction of a light emitting part.
Preferably, the bar code device sends the decoded data to the host after decoding the bar code, the host sends a custom HID message containing an ACK command indicating that the user has received the custom HID message to the bar code device through the custom HID device after receiving the decoded data, and if the bar code device does not receive the ACK command after sending the decoded data for more than a preset time, the bar code decoded data is automatically retransmitted.
The invention has the following beneficial effects:
1. a bar code device control method and system based on USB composite equipment realizes bidirectional communication between a host and the bar code device, so that the host can control the bar code device and inquire equipment information and the like through parameter setting instructions.
2. A self-defined HID descriptor is added on the basis of a USBHID keyboard descriptor according to a self-defined HID protocol, so that a host end can identify the barcode equipment as an HID keyboard and the self-defined HID equipment, and the host and the barcode equipment can communicate bidirectionally.
3. A bar code device control method and a bar code device control system based on USB composite equipment can transmit various parameter setting instructions through a user-defined HID message, and realize all-dimensional data interaction between a host and the bar code device.
4. A bar code device control method and system based on USB composite device, which timely replies the bar code device when receiving the code scanning result, if not replying for a long time, the bar code device automatically retransmits, avoiding repeated code scanning and long-time waiting for code scanning success or not.
Drawings
FIG. 1 is a schematic flow diagram of the prior art;
FIG. 2 is a schematic flow chart of the present invention;
FIG. 3 is a schematic diagram of the interaction between the barcode device and the host according to the present invention;
FIG. 4 is a schematic diagram of a host initiated scan flow according to the present invention;
FIG. 5 is a diagram of a composite device descriptor in accordance with the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Example one
The HID in the USB protocol includes various HID (Human Interface Device) Device protocols, such as a USB HID keyboard protocol, a USB HID mouse protocol, a USB HID joystick protocol and the like, and the HID also includes a custom HID protocol which only defines the input and output functions.
Referring to fig. 2 and 3, a barcode device control method based on a USB composite device includes the following steps: the bar code equipment is connected with the host through a USB interface, and the bar code equipment sends a composite equipment descriptor to the host, wherein the composite equipment descriptor comprises a USB HID keyboard descriptor and a custom HID descriptor; the host generates two devices, namely an HID keyboard and a custom HID device, in a device manager of the host according to the composite device descriptor, and specifically, the host acquires the drive of the HID keyboard and the drive of the custom HID device from a driver according to the composite device descriptor and then generates the HID keyboard and the custom HID device in the device manager of the host; the host sends a custom HID message to the bar code equipment through the custom HID equipment, and receives the custom HID message from the bar code equipment through the custom HID equipment, wherein the custom HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or bar code decoding data. The bar code equipment receives and analyzes the user-defined HID message to obtain a data field, and executes the operation corresponding to the data field to realize the control of the bar code equipment by the host; the bar code equipment also sends a user-defined HID message to the host computer, and transmits decoding data or replies to the parameter setting instruction through the user-defined HID message.
It should be noted that the descriptor is data for describing the characteristics of the device, and the data format is defined by the protocol, and the function of the descriptor is to inform the host of the relevant information of the device, let the host know what the device is, and thus load the corresponding driver and generate the corresponding device.
Referring to fig. 5, the USB HID keyboard descriptor includes a barcode device descriptor, a configuration descriptor, an interface descriptor i, an HID descriptor i, a report descriptor i, and an endpoint descriptor i, and the custom HID device descriptor includes an interface descriptor ii, an HID descriptor ii, a report descriptor ii, and an endpoint descriptor ii.
The composite device descriptor is defined in the following tables 1 to 10.
Table 1:
table 2:
table 3:
table 4:
table 5:
table 6:
table 7:
table 8:
table 9:
table 10:
as shown in table 11, the custom HID message may use 64 bytes, where byte 0 describes a message ID, byte 1 describes a transmission data length, bytes 2 to 57 are used to describe a scan code result or a parameter setting instruction, bytes 58 to 61 are reserved, byte 62 indicates a fixed value, and byte 64 describes whether data transmission is finished.
Table 11:
the parameter setting instruction comprises a code scanning function enabling different barcodes, a scanning starting instruction, a scanning ending instruction, an ACK instruction used for confirming the received information, a heartbeat instruction, an inquiry instruction, an opening/closing instruction of a sound part on the barcode equipment and an opening/closing instruction of a light emitting part. The code scanning function of different barcodes is enabled, for example, the code scanning function of a one-dimensional barcode is turned on/off, or the code scanning function of a two-dimensional barcode is turned on/off, and the like. The heartbeat instruction refers to that the host computer sends an instruction to the bar code equipment at regular intervals, and whether the bar code equipment is connected online is judged according to whether the bar code equipment replies.
The parameter setting instruction may employ codes as shown in table 12.
Table 12:
| function(s) | Instruction (HEX) |
| Start scanning | 04 E4 04 00 FF 14 |
| End scan | 04 E5 04 00 FF 13 |
| ACK | 04 D0 00 00 FF 2C |
| Enabling QR | 08 C6 04 08 00 F0 25 01 FE 10 |
| Heartbeat instruction | 04 50 00 00 FF AC |
In the method for controlling the barcode device based on the USB composite device, a USB HID keyboard protocol and a custom HID protocol are used in combination, so that the host and the barcode device can perform bidirectional communication based on the custom HID protocol, data transmission between the host and the barcode device is realized, and the host can further control the barcode device and obtain information of the barcode device through a parameter setting instruction, thereby improving the performance and function of the barcode device.
Referring to fig. 4, the application process of the customized HID message in this embodiment is as follows:
QR enable setting procedure:
step 1, a host sends a custom HID message containing a QR enabling instruction through custom HID equipment;
and 2, after receiving the user-defined HID message, the bar code equipment analyzes the message to obtain a QR instruction, completes QR enabling setting and replies the user-defined HID message containing an ACK instruction.
Starting a code scanning setting process:
step 3, the host sends a custom HID message containing a code scanning starting instruction through the custom HID;
and 4, after receiving the user-defined HID message, the bar code equipment obtains a code scanning starting instruction after analysis, starts code scanning and replies the user-defined HID message containing the ACK instruction.
And a code scanning result transmission process:
step 5, the bar code equipment successfully scans the code, and the user-defined HID equipment (sends a user-defined HID message containing bar code decoding data to the host) or the HID keyboard is used for transmitting a code scanning result to the host;
and 6, if the host receives the code scanning result through the self-defined HID, sending a self-defined HID message containing an ACK instruction to the bar code equipment through the self-defined HID, and if the bar code equipment does not receive the ACK instruction after sending the bar code decoding data for more than the preset time, retransmitting the code scanning result (namely the bar code decoding data).
Scanning the code to finish the setting process:
step 7, after receiving the code scanning result, the host sends a custom HID message containing a code scanning ending instruction through the custom HID;
and 8, after receiving the user-defined HID message, the bar code equipment analyzes the message to obtain a code scanning ending instruction, stops scanning the code and replies the user-defined HID message containing the ACK instruction.
Heartbeat instruction setting process:
the host computer can send heartbeat instruction at any time and monitor the online state of the bar code equipment, and the method specifically comprises the following steps: the host sends a custom HID message containing a heartbeat instruction through the custom HID; and after receiving the user-defined HID message, the bar code equipment analyzes the message to obtain a heartbeat instruction, and replies the user-defined HID message containing the ACK instruction. The host computer receives the user-defined HID message of the ACK instruction to know that the bar code equipment is on-line, and if the user-defined HID message which is sent by the bar code equipment and contains the ACK instruction is not received within a preset time range, the bar code equipment is judged to be off-line.
Example two
A bar code device control system based on USB composite equipment comprises bar code equipment and a host, wherein the bar code equipment is connected with the host through a USB interface, the bar code equipment sends composite equipment descriptors to the host, and the composite equipment descriptors comprise USBHID keyboard descriptors and custom HID equipment descriptors; the host generates two devices, namely an HID keyboard and a custom HID device in a device manager of the host according to the composite device descriptor; the host sends a user-defined HID message to the bar code equipment through the user-defined HID equipment and receives the user-defined HID message from the bar code equipment through the user-defined HID equipment, wherein the user-defined HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or bar code decoding data. The bar code equipment receives and analyzes the user-defined HID message to obtain a data field, and executes the operation corresponding to the data field to realize the control of the bar code equipment by the host; the bar code equipment also sends a user-defined HID message to the host computer, and transmits decoding data or replies to the parameter setting instruction through the user-defined HID message.
The host computer sends a custom HID message to the bar code equipment through the custom HID equipment and receives the custom HID message from the bar code equipment through the custom HID equipment, the custom HID message at least comprises a message ID field and a data field, the data field is a parameter setting instruction, and the host computer receives bar code decoding data from the bar code equipment through an HID keyboard.
Referring to fig. 5, the USB HID keyboard descriptor includes a barcode device descriptor, a configuration descriptor, an interface descriptor i, an HID descriptor i, a report descriptor i, and an endpoint descriptor i, and the custom HID device descriptor includes an interface descriptor ii, an HID descriptor ii, a report descriptor ii, and an endpoint descriptor ii.
The parameter setting instruction comprises a code scanning function enabling different barcodes, a scanning starting instruction, a scanning ending instruction, an ACK instruction used for confirming the received information, a heartbeat instruction, an inquiry instruction, an opening/closing instruction of a sound part on the barcode equipment and an opening/closing instruction of a light emitting part. The code scanning function of different barcodes is enabled, for example, the code scanning function of a one-dimensional barcode is turned on/off, or the code scanning function of a two-dimensional barcode is turned on/off, and the like. The heartbeat instruction refers to that the host computer sends an instruction to the bar code equipment at regular intervals, and whether the bar code equipment is connected online is judged according to whether the bar code equipment replies.
And after the bar code equipment scans the code, sending a self-defined HID message containing bar code decoding data to the host, sending the self-defined HID message containing an ACK instruction to the bar code equipment through the self-defined HID when the host receives the self-defined HID message, and retransmitting the bar code decoding data if the bar code equipment does not receive the ACK instruction after sending the bar code decoding data for more than a preset time.
Other embodiments of the present embodiment not described in detail are the same as those in the first embodiment.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A bar code equipment control method based on USB composite equipment is characterized by comprising the following steps: the bar code equipment is connected with the host through a USB interface, and the bar code equipment sends a composite equipment descriptor to the host, wherein the composite equipment descriptor comprises a USB HID keyboard descriptor and a custom HID descriptor;
the host generates an HID keyboard and a user-defined HID in a device manager of the host according to the composite device descriptor;
the host sends a user-defined HID message to the bar code equipment through the user-defined HID equipment, and receives the user-defined HID message from the bar code equipment through the user-defined HID equipment, wherein the user-defined HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or decoding data of the bar code equipment on the bar code;
the bar code equipment receives and analyzes the user-defined HID message to obtain a data field, and executes the operation corresponding to the data field to realize the control of the bar code equipment by the host;
the bar code equipment also sends a user-defined HID message to the host computer, and transmits decoding data or replies to the parameter setting instruction through the user-defined HID message.
2. The barcode device control method according to claim 1, wherein the barcode device control method comprises: the USB HID keyboard descriptor comprises a bar code device descriptor, a configuration descriptor, an interface descriptor I, an HID descriptor I, a report descriptor I and an endpoint descriptor I, and the custom HID device descriptor comprises an interface descriptor II, an HID descriptor II, a report descriptor II and an endpoint descriptor II.
3. The barcode device control method according to claim 1, wherein the parameter setting command includes a scan function enabling different barcodes, a start scan command, an end scan command, an ACK command for confirming that received, a heartbeat command, a query command, an on/off command of a sound part on the barcode device, and an on/off command of a light emitting part.
4. The barcode device control method according to claim 3, wherein the barcode device control method comprises: the method comprises the steps that after the bar code equipment decodes a bar code, decoded data are sent to a host, after the host receives the decoded data, a user-defined HID message containing an ACK instruction is sent to the bar code equipment through the user-defined HID, and if the bar code equipment does not receive the ACK instruction after sending the decoded data for more than preset time, the bar code decoded data are automatically retransmitted.
5. A bar code device control system based on USB composite equipment is characterized by comprising bar code equipment and a host, wherein the bar code equipment is connected with the host through a USB interface, the bar code equipment sends composite equipment descriptors to the host, and the composite equipment descriptors comprise USB HID keyboard descriptors and custom HID equipment descriptors;
the host generates an HID keyboard and a user-defined HID in a device manager of the host according to the composite device descriptor;
the host sends a user-defined HID message to the bar code equipment through the user-defined HID equipment, and receives the user-defined HID message from the bar code equipment through the user-defined HID equipment, wherein the user-defined HID message at least comprises a message ID field and a data field, and the data field is a parameter setting instruction or decoding data of the bar code equipment on the bar code;
the bar code equipment receives and analyzes the user-defined HID message to obtain a data field, and executes the operation corresponding to the data field to realize the control of the bar code equipment by the host;
the bar code equipment also sends a user-defined HID message to the host computer, and transmits decoding data or replies to the parameter setting instruction through the user-defined HID message.
6. The USB composite device based bar code device control system of claim 5, wherein the USB HID keyboard descriptor comprises a bar code device descriptor, a configuration descriptor, an interface descriptor I, an HID descriptor I, a report descriptor I and an endpoint descriptor I, and the custom HID device descriptor comprises an interface descriptor II, an HID descriptor II, a report descriptor II and an endpoint descriptor II.
7. The barcode device control system according to claim 5, wherein the barcode device control system comprises: the parameter setting instruction comprises a code scanning function enabling different barcodes, a scanning starting instruction, a scanning ending instruction, an ACK instruction used for confirming the received information, a heartbeat instruction, an inquiry instruction, an opening/closing instruction of a sound part on the barcode equipment and an opening/closing instruction of a light emitting part.
8. The barcode device control system according to claim 7, wherein the barcode device control system comprises: the method comprises the steps that after the bar code equipment decodes a bar code, decoding data are sent to a host, after the host receives the decoding data, a user-defined HID message containing an ACK instruction used for indicating that the user-defined HID message has received the received ACK instruction is sent to the bar code equipment through the user-defined HID equipment, and if the bar code equipment does not receive the ACK instruction after the bar code equipment sends the decoding data for more than preset time, the bar code decoding data are automatically retransmitted.
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