CN104102612A - System based on short message service - Google Patents
System based on short message service Download PDFInfo
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- CN104102612A CN104102612A CN201310122933.3A CN201310122933A CN104102612A CN 104102612 A CN104102612 A CN 104102612A CN 201310122933 A CN201310122933 A CN 201310122933A CN 104102612 A CN104102612 A CN 104102612A
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- cdma
- short message
- message service
- system based
- cdma module
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- Oscillators With Electromechanical Resonators (AREA)
Abstract
The invention discloses a system based on a short message service. The system comprises a CDMA terminal data sending part controlled by a single chip and a PC terminal data receiving part and is characterized in that the single chip is connected with a CDMA module through an RS-232 level switching circuit; the CDMA module is connected with the PC terminal data receiving part through a CDMA network; the PC terminal data receiving part also comprises a CDMA module. Compared with the prior art, the system based on the short message service is more compatible with communication equipment.
Description
Technical field
The present invention relates to short-message system field, particularly the system based on short message service.
Background technology
The formal STD bus being most widely used in asynchronous serial communication of announcing of RS-232C Shi You EIA (EIA).It has comprised the regulation of the electric and mechanical aspects of serial-by-bit transmission.Be applicable to short distance or with the communication situation of modulator-demodular unit.It is suitable for the communication of message transmission rate within the scope of 0-20000b/s.The relevant issues of this standard to serial communication interface, as signal wire function, the opering characteristic of electric apparatus all make explicit provisions.Yet commercially available CDMA module all has data outlet in the market, and substantially all support the AT steering order (CDMA-SMS-AT) relevant to CDMA short message, CDMA module is received instruction and outwards exports data with serial mode by data port.Theoretically, the serial ports of finding out RXD, TXD and GND pin and single-chip microcomputer in data port is corresponding to be connected and to complete the current single-chip microcomputer of hardware interface and module has just adopted which, therefore without level conversion.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the invention provides the system based on short message service, effectively solved the problem that above-mentioned prior art exists.
To achieve these goals, the technical solution used in the present invention is: the 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 CDMA module by a RS-232 level shifting circuit, 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 CDMA module.
As preferably, described CDMA module is built-in with RS-232 interface, does not need to arrange RS-232 level shifting circuit.
As preferably, described system crystal oscillator is 2M-12M.
As preferably, described RS-232 level shifting circuit adopts when be input as-15V of A, be output as+5V of B, when being+and triode is with regard to conducting during 15V, and B is just the such structure of 0V, and the high level of single-chip microcomputer and CDMA module is 3.3v.
Compared with prior art, this beneficial effect of the invention: the present invention adopts RS-232 level shifting circuit, the communication facilities that the present invention and communications equipment vendor are produced is realized compatible result.The present invention more optimizes the prior art of function ratio to the improvement of structure.
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Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is RS-232 level shifting circuit.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
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 CDMA module by a RS-232 level shifting circuit, in the present embodiment, described RS-232 level shifting circuit adopts when be input as-15V of A, be output as+5V of B, when being+during 15V triode with regard to conducting, B is just the such structure of 0V, as CDMA module is built-in with RS-232 interface, do not need to arrange RS-232 level shifting circuit, CDMA module connects PC end data receiving unit by GSM network, described PC end data receiving unit also comprises a CDMA module, in the present embodiment, described cdma network connects PC by CDMA module, described system crystal oscillator is 2M-12M, the present invention is optimum is crystal oscillator employing 2M, baud rate is 9600b/s.
CDMA module of the present invention 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 that 2 pin receive data, and another is 5 pin ground connection.Other pin, for irrelevant pin, can be not considered here.The level of RS-232 is-3～-15 presentation logics " 1 ", and 3～15 presentation logics " 0 ", so must carry out level conversion.What first we considered is to transform special chip with MAX232 level, but experimental result draws the standard that also can reach level conversion as the circuit of Fig. 6 .2 completely.
Claims (5)
1. the system based on 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 CDMA module by a RS-232 level shifting circuit, 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 CDMA module.
3. the system based on short message service according to claim 1, is characterized in that: described CDMA module is built-in with RS-232 interface, does not need to arrange RS-232 level shifting circuit.
4. the system based on short message service according to claim 1, 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 adopts when be input as-15V of A, be output as+5V of B, when being+during 15V triode with regard to conducting, B is just the such structure of 0V, and the high level of single-chip microcomputer and CDMA module is 3.3v.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310122933.3A CN104102612A (en) | 2013-04-10 | 2013-04-10 | System based on short message service |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310122933.3A CN104102612A (en) | 2013-04-10 | 2013-04-10 | System based on short message service |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104102612A true CN104102612A (en) | 2014-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310122933.3A Pending CN104102612A (en) | 2013-04-10 | 2013-04-10 | System based on short message service |
Country Status (1)
| Country | Link |
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| CN (1) | CN104102612A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492696A (en) * | 2003-08-22 | 2004-04-28 | 江汉大学 | Radio communication device using GPRS module |
| CN101059903A (en) * | 2007-06-01 | 2007-10-24 | 芜湖欣兰德工业制品有限责任公司 | Short message alarm-based anti-theft device for coffer |
| CN101150783A (en) * | 2007-11-08 | 2008-03-26 | 河北大学 | A method and device for automatic mobile phone SMS recording |
| CN203204610U (en) * | 2013-04-10 | 2013-09-18 | 四川鹏翔电子科技有限责任公司 | Short message service-based system |
-
2013
- 2013-04-10 CN CN201310122933.3A patent/CN104102612A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1492696A (en) * | 2003-08-22 | 2004-04-28 | 江汉大学 | Radio communication device using GPRS module |
| CN101059903A (en) * | 2007-06-01 | 2007-10-24 | 芜湖欣兰德工业制品有限责任公司 | Short message alarm-based anti-theft device for coffer |
| CN101150783A (en) * | 2007-11-08 | 2008-03-26 | 河北大学 | A method and device for automatic mobile phone SMS recording |
| CN203204610U (en) * | 2013-04-10 | 2013-09-18 | 四川鹏翔电子科技有限责任公司 | Short message service-based system |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141015 |
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| RJ01 | Rejection of invention patent application after publication |