CN201700014U - 20mA current loop gateway for industrial field control - Google Patents
20mA current loop gateway for industrial field control Download PDFInfo
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- CN201700014U CN201700014U CN2010202376416U CN201020237641U CN201700014U CN 201700014 U CN201700014 U CN 201700014U CN 2010202376416 U CN2010202376416 U CN 2010202376416U CN 201020237641 U CN201020237641 U CN 201020237641U CN 201700014 U CN201700014 U CN 201700014U
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- current loop
- gprs
- interface circuit
- at91sam7a3
- processor
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Abstract
The utility model discloses a 20mA current loop gateway for industrial field control, which comprises a GPRS transceiver, an AT91SAM7A3 processor and a 20mA current loop physical interface. The AT91SAM7A3 processor is respectively in bidrectional connection with the GPRS transceiver and the 20mA current loop physical interface. The GPRS transceiver is an external interface module, demodulates a received signal into an RS232 serial communication data stream, provides the data stream to the AT91SAM7A3 processor and/or sends a GPRS signal generated by the AT91SAM7A3 processor to an ANT antenna so as to be communicated with the outside. The utility model replaces the conventional wireless transmission technology with GPRS wireless transmission technology, adopts an internal bus mode and avoids time delay and instability of equipment cascading so as to have high reliability. The utility model has the advantage of high integration and saves cost of other equipment so as to have the characteristic of low cost.
Description
Technical field
The utility model relates to a kind of Data Interchange Technology based on 20mA electric current loop wire transmission network and wireless-transmission network, relates in particular to a kind of 20mA electric current loop gateway that is used for industry spot control.
Background technology
The vehicle monitoring system of field of traffic such as urban light rail, subway, automobile, 20mA electric current loop transport network interface circuit has been a kind of widely used circuit, its great advantage be the Low ESR transmission line insensitive to electrical noise, easily realize that photoelectricity is isolated, transmission range is very long.
In existing vehicle monitoring system, the signal that sends from 20mA electric current loop interface equipment often needs cascade, forwarding by 20mA electric current loop receiving system, central control unit and other wireless devices to be received by ground monitoring system, and this has just increased the retardance and the unreliability of signal of interest.
Along with the fast development of the communication technology, GPRS grows up in CHINESE REGION rapidly as a kind of general packet radio technology.GPRS have high efficiency of transmission at a high speed or low speed data, optimization Internet resources and Radio Resource, the method for salary distribution flexibly, support point-to-point or put series of advantages such as multiple spot service.Therefore it is widely used in the remote data acquisition and the monitoring in fields such as finance, traffic.But in the industry spot control technology, lack a kind of based on the DTU (Data Transfer unit) between 20mA electric current loop wire transmission network and the GPRS wireless-transmission network---GPRS-20mA gateway.
Summary of the invention
The purpose of the present utility model is the low 20mA electric current loop gateway based on the industry spot control of GPRS Radio Transmission Technology of design a kind of reliability height, flexibility height, cost.
For achieving the above object, the technical solution of the utility model is as follows: a kind of 20mA electric current loop gateway that is used for industry spot control, comprise GPRS transceiver, AT91SAM7A3 processor and 20mA electric current loop physical interface, described AT91SAM7A3 processor respectively with GPRS transceiver and two-way connection of 20mA electric current loop physical interface; Described GPRS transceiver is made up of GPRS communication module, ANT antenna and SIM interface circuit, and the GPRS communication module is connected with the SIM interface circuit is two-way with the ANT antenna respectively; Described AT91SAM7A3 processor adopting RS232 serial communication data-interface; Described 20mA electric current loop interface circuit comprises receiving interface circuit and transmission interface circuit, and the receiving interface circuit connects the input of AT91SAM7A3 processor, and the transmission interface circuit connects the output of AT91SAM7A3 processor.
Compared with prior art, the utlity model has following beneficial effect:
1, because the utility model adopts the GPRS Radio Transmission Technology to replace traditional Radio Transmission Technology, and adopts the mode of internal bus, avoided the time-delay and the unsteadiness of equipment cascading, therefore have high reliability.
2, because 20mA electric current loop physical interface equipment of the present utility model is commonplace, the direct and ground system communication by GPRS of this kind equipment can be used for monitoring of tools, therefore have high flexibility.
3, since the utility model integrated the function of 20mA interface equipment, GPRS interface equipment, central control unit equipment, saved the cost of miscellaneous equipment, therefore have characteristics with low cost.
Description of drawings
The utility model only has a width of cloth accompanying drawing, wherein:
Fig. 1 is a structured flowchart of the present utility model.
Among the figure: 1, GPRS transceiver, 2, the AT91SAM7A3 processor, 3,20mA electric current loop physical interface.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.As shown in Figure 1, a kind of 20mA electric current loop gateway that is used for industry spot control, comprise GPRS transceiver 1, AT91SAM7A3 processor 2 and 20mA electric current loop physical interface 3, described AT91SAM7A3 processor 2 respectively with GPRS transceiver 1 and 3 two-way connections of 20mA electric current loop physical interface; Described GPRS transceiver 1 is made up of GPRS communication module, ANT antenna and SIM interface circuit, and the GPRS communication module is connected with the SIM interface circuit is two-way with the ANT antenna respectively; Described AT91SAM7A3 processor 2 adopts RS232 serial communication data-interface; Described 20mA electric current loop interface circuit comprises receiving interface circuit and transmission interface circuit, and the receiving interface circuit connects the input of AT91SAM7A3 processor 2, and the transmission interface circuit connects the output of AT91SAM7A3 processor 2.
Operation principle of the present utility model is as follows: GPRS transceiver 1 is the external interface module, and the signal that it comes reception is demodulated to RS232 serial communication data flow and offers AT91SAM7A3 processor 2 and/or the GRPS signal of its generation is delivered to the ANT antenna communicate by letter with extraneous; AT91SAM7A3 processor 2 is responsible for that the digital quantities that will transmit or analog quantity are packaged into that RS232 serial communication data flow delivers to that the 20mA current loop circuit converts the corresponding signal of telecommunication to or the signal resolution that the 20mA circuit is sent here is become normal data and deposit self buffer area in, reads for AT91SAM7A3 processor 2; AT91SAM7A3 processor 2 is responsible for the generation of control RS232 serial communication work schedule and RS232 serial communication data, and the control of monitoring voltage, dongle and/or working power; 20mA electric current loop interface circuit comprises receiving interface circuit and transmission interface circuit, and 0～5V digital quantity signal of being responsible for transmitting converts that 0～20mA analog signals sends or convert 0～20mA analog signals to 0～5V digital quantity signal receives to; GPRS transceiver 1 is the external interface module, and the signal that it comes reception is demodulated to the RS232 data flow and handles for controller and/or the GRPS signal of its generation is delivered to the ANT antenna communicate by letter with extraneous.
GPRS transceiver 1 of the present utility model is made up of GPRS communication module, ANT antenna and SIM interface circuit.The ANT antenna carries out the transmitting-receiving of GPRS wireless signal as the radio-frequency antenna of GPRS module; The SIM interface circuit is used to provide the SIM slot, realizes the authentication of GPRS access network; GPRS communication mould is used the signal that reception is come to be demodulated to RS232 serial communication data flow and is handled for controller and/or the GRPS signal of its generation is delivered to the ANT antenna communicate by letter with extraneous.
AT91SAM7A3 processor 2 of the present utility model is cores of whole gateway, and it is made up of two parts: i.e. hardware and Control Software.The effect of hardware mainly is a work schedule of being responsible for control MVB protocol controller chip, will be responsible for also that simultaneously monitoring voltage, dongle, working power provide etc.The effect of Control Software is that the digital quantity that will transmit or analog quantity are packaged into that the RS232 serial data stream delivers to that the 20mA circuit conversion becomes the corresponding signal of telecommunication or the signal resolution that the 20mA circuit is sent here are become normal data and deposit self buffer area in, reads for controller.
Claims (1)
1. one kind is used for the 20mA electric current loop gateway that industry spot is controlled, it is characterized in that: comprise GPRS transceiver (1), AT91SAM7A3 processor (2) and 20mA electric current loop physical interface (3), described AT91SAM7A3 processor (2) respectively with GPRS transceiver (1) and two-way connection of 20mA electric current loop physical interface (3); Described GPRS transceiver (1) is made up of GPRS communication module, ANT antenna and SIM interface circuit, and the GPRS communication module is connected with the SIM interface circuit is two-way with the ANT antenna respectively; Described AT91SAM7A3 processor (2) adopts RS232 serial communication data-interface; Described 20mA electric current loop interface circuit comprises receiving interface circuit and transmission interface circuit, and the receiving interface circuit connects the input of AT91SAM7A3 processor (2), and the transmission interface circuit connects the output of AT91SAM7A3 processor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202376416U CN201700014U (en) | 2010-06-21 | 2010-06-21 | 20mA current loop gateway for industrial field control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202376416U CN201700014U (en) | 2010-06-21 | 2010-06-21 | 20mA current loop gateway for industrial field control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201700014U true CN201700014U (en) | 2011-01-05 |
Family
ID=43401261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202376416U Expired - Fee Related CN201700014U (en) | 2010-06-21 | 2010-06-21 | 20mA current loop gateway for industrial field control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201700014U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610086A (en) * | 2011-01-25 | 2012-07-25 | 铁道部运输局 | Signal processing device |
| CN103631172A (en) * | 2012-08-27 | 2014-03-12 | 成都众山科技有限公司 | Wireless remote detection control system applied to oilfield sewage treatment |
| CN105203891A (en) * | 2015-10-26 | 2015-12-30 | 亚世光电股份有限公司 | Handheld intelligent detection instrument and application method thereof |
-
2010
- 2010-06-21 CN CN2010202376416U patent/CN201700014U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610086A (en) * | 2011-01-25 | 2012-07-25 | 铁道部运输局 | Signal processing device |
| CN102610086B (en) * | 2011-01-25 | 2013-09-04 | 铁道部运输局 | Signal processing device |
| CN103631172A (en) * | 2012-08-27 | 2014-03-12 | 成都众山科技有限公司 | Wireless remote detection control system applied to oilfield sewage treatment |
| CN105203891A (en) * | 2015-10-26 | 2015-12-30 | 亚世光电股份有限公司 | Handheld intelligent detection instrument and application method thereof |
| CN105203891B (en) * | 2015-10-26 | 2018-02-09 | 亚世光电股份有限公司 | A kind of handle type intelligent detection instrument and application method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20130621 |