CN104539500B - A kind of external device extension method of car-mounted terminal - Google Patents
A kind of external device extension method of car-mounted terminal Download PDFInfo
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- CN104539500B CN104539500B CN201410848433.2A CN201410848433A CN104539500B CN 104539500 B CN104539500 B CN 104539500B CN 201410848433 A CN201410848433 A CN 201410848433A CN 104539500 B CN104539500 B CN 104539500B
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- car
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Abstract
The present invention provides a kind of external device extension method of car-mounted terminal, includes the following steps：Step 1, the car-mounted terminal are connect with serial box input terminal, the output terminal connection external equipment of the serial ports box, the external equipment of step 2, the connecting object that serial ports is set and the connection of serial box output terminal, when step 3, car-mounted terminal transmission data one are wrapped, first package according to the communication protocol of serial box, obtain a group packet one, then it is organized packet one and is sent to serial box, serial box is parsed according to the communication protocol, and the data packet one then is sent to the external equipment according to the Extended ID；When the external equipment is to car-mounted terminal transmission data packet two, the serial box packages after receiving data packet two according to the communication protocol, obtains a group packet two, the car-mounted terminal is parsed according to the communication protocol, obtains the data packet two.The present invention realizes the diversification of serial ports external equipment and realizes that a serial ports can dock the function of multiple external equipments simultaneously.
Description
【Technical field】
The present invention relates to a kind of external device extension methods of car-mounted terminal.
【Background technology】
The multiple external equipments of connection are usually required on automobile, specific work(is realized generally by serial ports connection external equipment
Can, for example, it is desired to connect automobile data recorder in real time record vehicle transport condition, still.For different clients demand
Can be corresponding different, for example, taxi needs to access meter record operation state, bus need to record bus by camera
Operating status.Traditional car-mounted terminal generally only provides 2~3 serial interfaces and is used for connecting external equipment, with the work(of client
Energy demand is more and more, and the peripheral hardware connect is more and more, and traditional car-mounted terminal can not meet customer need.It is more in order to meet client
The connection requirement two of external equipment develops the new car-mounted terminal for having more Multi-serial port, and not only the new product period is long, and develop into
This height, it is clear that undesirable.
【Invention content】
The technical problem to be solved in the present invention is to provide a kind of external device extension method of car-mounted terminal, not change
One serial ports of realization serial ports external equipment diversification and realization can be docked simultaneously outside multiple under the premise of becoming original car-mounted terminal hardware
The function of portion's equipment.
The invention is realized in this way：1st, a kind of external device extension method of car-mounted terminal, which is characterized in that including such as
Lower step：
Step 1 connects the serial ports of the input terminal of a serial box and car-mounted terminal, will an at least external equipment and the string
The output terminal connection of mouth box, the serial box include at least two output terminals；
Step 2 is set the connecting object of the serial ports by the car-mounted terminal as serial box and the serial ports is configured
The serial ports parameter for the different external equipments that box is connected, the serial ports parameter include the Extended ID of each output terminal；
When step 3, car-mounted terminal are wrapped to a wherein external equipment transmission data one, the data packet one is first according to serial box
Communication protocol package, obtain group packet one, then organize and wrap one and be sent to the serial box, the communication protocol definition
Group Bao Yizhong includes the Extended ID, and the serial box is parsed according to the communication protocol, obtains data packet one, then
The data packet one is sent to by the external equipment according to the Extended ID；
When the external equipment is to car-mounted terminal transmission data packet two, the serial box is received after data packet two according to described
Communication protocol packages, and obtains a group packet two, described group of packet two is sent to the car-mounted terminal by the serial box, described vehicle-mounted
Terminal is parsed according to the communication protocol, obtains the data packet two, and the communication protocol also defines group Bao Erzhong and includes institute
State Extended ID.
Further, the data format of described group of packet one include frame head, serial ports box equipment mark code, include the expansion
Open up command id, content of parameter, verification and and the postamble of ID.
Further, the data format of described group of packet two include frame head, serial ports box equipment mark code described in Extended ID,
Data content and postamble.
The invention has the advantages that：
Car-mounted terminal of the present invention identifies the corresponding external equipment of each data packet by Extended ID, and serial box is known by Extended ID
Other data transmit object, in the case where car-mounted terminal hardware does not change, realize the external multiple external equipments of single serial ports, meet visitor
The addition demand of family external equipment.
【Description of the drawings】
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the connection diagram of car-mounted terminal of the present invention and external equipment.
Fig. 2 is flow chart of the car-mounted terminal data transmission of the present invention to external equipment.
Fig. 3 is flow chart of the external data data transmission of the present invention to car-mounted terminal.
【Specific embodiment】
It please refers to Fig.1 to Fig.3, a kind of external device extension method of car-mounted terminal includes the following steps：
Step 1 connects the serial ports of the input terminal of a serial box and car-mounted terminal, will an at least external equipment and the string
The output terminal connection of mouth box, the serial box include at least two output terminals；The external equipment can be camera, haggle over device,
Light-emitting diode display, automobile data recorder；
Step 2 is set the connecting object of the serial ports by the car-mounted terminal as serial box and the serial ports is configured
The serial ports parameter for the different external equipments that box is connected, the serial ports parameter include the Extended ID of each output terminal；
When step 3, car-mounted terminal are wrapped to a wherein external equipment transmission data one, the data packet one is first according to serial box
Communication protocol package, obtain group packet one, then organize and wrap one and be sent to the serial box, the communication protocol definition
Group Bao Yizhong includes the Extended ID, and the serial box is parsed according to the communication protocol, obtains data packet one, then
The data packet one is sent to by the external equipment according to the Extended ID；In the present embodiment, the data lattice of described group of packet one
Formula include frame head, the equipment mark code of serial ports box, the command id comprising the Extended ID, content of parameter, verification and and
Postamble.
When the external equipment is to car-mounted terminal transmission data packet two, the serial box is received after data packet two according to described
Communication protocol packages, and obtains a group packet two, described group of packet two is sent to the car-mounted terminal by the serial box, described vehicle-mounted
Terminal is parsed according to the communication protocol, obtains the data packet two, and the communication protocol also defines group Bao Erzhong and includes institute
Extended ID is stated, in the present embodiment, the data format of described group of packet two includes expansion described in the equipment mark code of frame head, serial ports box
Open up ID, data content and postamble.
Car-mounted terminal of the present invention identifies the corresponding external equipment of each data packet by Extended ID, and serial box is known by Extended ID
Other data transmit object, in the case where car-mounted terminal hardware does not change, realize the external multiple external equipments of single serial ports, meet visitor
The addition demand of family external equipment.
Although specific embodiments of the present invention have been described above, those familiar with the art should manage
Solution, our described specific embodiments are merely exemplary rather than for the restriction to the scope of the present invention, are familiar with this
The equivalent modification and variation that the technical staff in field is made in the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (3)
1. a kind of external device extension method of car-mounted terminal, which is characterized in that include the following steps：
Step 1 connects the serial ports of the input terminal of a serial box and car-mounted terminal, will an at least external equipment and the serial box
Output terminal connection, the serial box include at least two output terminals；
Step 2 is set the connecting object of the serial ports by the car-mounted terminal as serial box and the serial box institute is configured
The serial ports parameter of the different external equipments of connection, the serial ports parameter include the Extended ID of each output terminal；
When step 3, car-mounted terminal are wrapped to a wherein external equipment transmission data one, the data packet one is first according to the logical of serial box
Letter agreement packages, and obtains group packet one, then organize and wrap one and be sent to the serial box, communication protocol definition group
Bao Yizhong includes the Extended ID, and the serial box is parsed according to the communication protocol, obtains data packet one, then basis
The data packet one is sent to the external equipment by the Extended ID；
When the external equipment is to car-mounted terminal transmission data packet two, the serial box is received after data packet two according to the communication
Agreement packages, and obtains a group packet two, described group of packet two is sent to the car-mounted terminal, the car-mounted terminal by the serial box
It is parsed according to the communication protocol, obtains the data packet two, the communication protocol also defines group Bao Erzhong and includes the expansion
Open up ID.
A kind of 2. external device extension method of car-mounted terminal according to claim 1, which is characterized in that described group of packet one
Data format include frame head, the equipment mark code of serial ports box, the command id comprising the Extended ID, content of parameter, school
Test and and postamble.
A kind of 3. external device extension method of car-mounted terminal according to claim 1, which is characterized in that described group of packet two
Data format include frame head, serial ports box equipment mark code described in Extended ID, data content and postamble.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848433.2A CN104539500B (en) | 2014-12-31 | 2014-12-31 | A kind of external device extension method of car-mounted terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848433.2A CN104539500B (en) | 2014-12-31 | 2014-12-31 | A kind of external device extension method of car-mounted terminal |
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| Publication Number | Publication Date |
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| CN104539500A CN104539500A (en) | 2015-04-22 |
| CN104539500B true CN104539500B (en) | 2018-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410848433.2A Active CN104539500B (en) | 2014-12-31 | 2014-12-31 | A kind of external device extension method of car-mounted terminal |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106004730A (en) * | 2016-07-12 | 2016-10-12 | 深圳华汽车科技有限公司 | Automotive heterogeneous network convergence device and plug and play expanding method of automotive intelligent equipment based on same |
| CN109739572B (en) * | 2018-12-25 | 2022-01-28 | 江南机电设计研究所 | Universal integrated serial port communication method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202009138U (en) * | 2011-04-07 | 2011-10-12 | 厦门翼迅智能科技有限公司 | Vehicle-mounted intelligent interface box |
| CN103631363A (en) * | 2013-09-22 | 2014-03-12 | 深圳市联和安业科技有限公司 | Automobile data interface expanding device and method for achieving data interaction |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8638207B2 (en) * | 2007-08-09 | 2014-01-28 | Drew Technologies | Modular vehicular diagnostic tool |
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2014
- 2014-12-31 CN CN201410848433.2A patent/CN104539500B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202009138U (en) * | 2011-04-07 | 2011-10-12 | 厦门翼迅智能科技有限公司 | Vehicle-mounted intelligent interface box |
| CN103631363A (en) * | 2013-09-22 | 2014-03-12 | 深圳市联和安业科技有限公司 | Automobile data interface expanding device and method for achieving data interaction |
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| CN104539500A (en) | 2015-04-22 |
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