CN203204610U - Short message service-based system - Google Patents
Short message service-based system Download PDFInfo
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- CN203204610U CN203204610U CN 201320177160 CN201320177160U CN203204610U CN 203204610 U CN203204610 U CN 203204610U CN 201320177160 CN201320177160 CN 201320177160 CN 201320177160 U CN201320177160 U CN 201320177160U CN 203204610 U CN203204610 U CN 203204610U
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- cdma
- short message
- message service
- cdma module
- data receiving
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Abstract
The utility model discloses a short message service-based system, which comprises a code division multiple access (CDMA) terminal data transmission part controlled by a single-chip microcomputer and a personal computer (PC)-terminal data receiving part. The system is characterized in that the single-chip microcomputer is connected with a CDMA module through an RS-232 level conversion circuit; the CDMA module is connected with the PC-terminal data receiving part through a CDMA network; and the PC-terminal data receiving part also comprises a CDMA module. Compared with the prior art, the system is more compatible with communication equipment.
Description
Technical field
The utility model relates to the short-message system field, particularly based on the system of short message service.
Background technology
RS-232C is by the formal STD bus that is most widely used in asynchronous serial communication of announcing of EIA (EIA).It has comprised the regulation of the electric and mechanical aspects of serial-by-bit transmission.Be fit to short distance or with the communication situation of modulator-demodular unit.It is suitable for the communication of message transmission rate in 0-20000b/s scope.This standard all makes explicit provisions such as signal wire function, the opering characteristic of electric apparatus to the relevant issues of serial communication interface.Yet commercially available CDMA module all has the data outlet in the market, and basically all supports the AT steering order (CDMA-SMS-AT) relevant with the CDMA short message, and the CDMA module receives instruction and outwards exports data with serial mode by data port.Theoretically, find out in data port that RXD, TXD namely finish the current single-chip microcomputer of hardware interface with the GND pin with the corresponding connection of serial ports of single-chip microcomputer and module has just adopted this mode, therefore need not level conversion.
The utility model content
For above-mentioned the deficiencies in the prior art part, the utility model provides the system based on short message service, has effectively solved the problem that above-mentioned prior art exists.
To achieve these goals, the technical solution adopted in the utility model is: based on the system of short message service, comprise monolithic processor controlled CDMA terminal data transmitting portion and PC end data receiving unit, described single-chip microcomputer connects the CDMA module by a RS-232 level shifting circuit, the CDMA module connects PC end data receiving unit by cdma network, and described PC end data receiving unit also comprises a CDMA module.
As preferably: described cdma network connects PC by the CDMA module.
As preferably, described CDMA module is built-in with RS-232 interface, then the RS-232 level shifting circuit need be set.
As preferably, described system crystal oscillator is 2M-12M.
As preferably, described RS-232 level shifting circuit adopt when A be input as-during 15V, B is output as+5V, when be+triode is with regard to conducting during 15V, B is the such structure of 0V just, the high level of single-chip microcomputer and CDMA module is 3.3v.
Compared with prior art, the beneficial effect of this utility model: the utility model adopts the RS-232 level shifting circuit, so that the communication facilities that the utility model and communications equipment vendor produce is realized compatible result.The utility model to the improvement of structure so that the prior art of function ratio more optimize.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the RS-232 level shifting circuit.
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
Referring to Fig. 1-2, system based on short message service, comprise monolithic processor controlled CDMA terminal data transmitting portion and PC end data receiving unit, described single-chip microcomputer connects the CDMA module by a RS-232 level shifting circuit, in the present embodiment, described RS-232 level shifting circuit adopt when A be input as-during 15V, B is output as+5V, when be+triode is with regard to conducting during 15V, B is the such structure of 0V just, be built-in with RS-232 interface such as the CDMA module, then do not need to arrange the RS-232 level shifting circuit, the CDMA module is by GSM network connection PC end data receiving unit, and described PC end data receiving unit also comprises a CDMA module, in the present embodiment, described cdma network connects PC by the CDMA module, described system crystal oscillator is 2M-12M, and the utility model is optimum for crystal oscillator adopts 2M, and baud rate is 9600b/s.
The utility model CDMA module adopts DB9 as communication interface.Utilize the communication process of CDMA module and single-chip microcomputer to measure and only only have two pin to work, one is 2 pin receive datas, and another is 5 pin ground connection.Other pin can be not considered here for irrelevant pin.The level of RS-232 is-3～-15 presentation logics " 1 ", and 3～15 presentation logics " 0 " transform so must carry out level.What at first we considered is to transform special chip with the MAX232 level, but the circuit that experimental result draws such as Fig. 6 .2 also can reach the standard that level transforms fully.
Claims (5)
1. based on the system of short message service, comprise monolithic processor controlled CDMA terminal data transmitting portion and PC end data receiving unit, it is characterized in that: described single-chip microcomputer connects the CDMA module by a RS-232 level shifting circuit, the CDMA module connects PC end data receiving unit by cdma network, and described PC end data receiving unit also comprises a CDMA module.
2. the system based on short message service according to claim 1 is characterized in that: described cdma network connects PC by the CDMA module.
3. the system based on short message service according to claim 1, it is characterized in that: described CDMA module is built-in with RS-232 interface, then the RS-232 level shifting circuit need be set.
4. the system based on short message service according to claim 1, it is characterized in that: described system crystal oscillator is 2M-12M.
5. the system based on short message service according to claim 1, it is characterized in that: described RS-232 level shifting circuit adopt when A be input as-during 15V, B is output as+5V, when be+during 15V triode with regard to conducting, B is the such structure of 0V just, and the high level of single-chip microcomputer and CDMA module is 3.3v.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177160 CN203204610U (en) | 2013-04-10 | 2013-04-10 | Short message service-based system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177160 CN203204610U (en) | 2013-04-10 | 2013-04-10 | Short message service-based system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203204610U true CN203204610U (en) | 2013-09-18 |
Family
ID=49148701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320177160 Expired - Fee Related CN203204610U (en) | 2013-04-10 | 2013-04-10 | Short message service-based system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203204610U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104102612A (en) * | 2013-04-10 | 2014-10-15 | 四川鹏翔电子科技有限责任公司 | System based on short message service |
-
2013
- 2013-04-10 CN CN 201320177160 patent/CN203204610U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104102612A (en) * | 2013-04-10 | 2014-10-15 | 四川鹏翔电子科技有限责任公司 | System based on short message service |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20170410 |