CN202795357U - GPS (Global Position System)-based serial RS232 (Recommend Standard 232) interface circuit - Google Patents
GPS (Global Position System)-based serial RS232 (Recommend Standard 232) interface circuit Download PDFInfo
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- CN202795357U CN202795357U CN 201220522506 CN201220522506U CN202795357U CN 202795357 U CN202795357 U CN 202795357U CN 201220522506 CN201220522506 CN 201220522506 CN 201220522506 U CN201220522506 U CN 201220522506U CN 202795357 U CN202795357 U CN 202795357U
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Abstract
The utility model discloses a GPS (Global Position System)-based serial RS232 (Recommend Standard 232) interface circuit, which comprises a MAX3238 chip and an interface DB9, wherein T1OUT of the MAX3238 chip is connected with a pin RXD of DB9; a pin R1IN of the MAX3238 is connected with a pin TXD of DB9, a pin V+ of the MAX3238 chip is connected with a capacitor C3, a pin V- of the MAX3238 is connected with a capacitor C4, and the other ends of the capacitors C3 and C4 are grounded at the same time; a capacitor C1 is connected between a pin C1+ and a pin C1- of the MAX3238 chip; and a capacitor C2 is connected between a pin C2+ and a pin C2- of the MAX3238 chip. The GPS-based serial RS232 interface circuit disclosed by the utility model can be used to enhance the antijamming capability of RS232 effectively.
Description
Technical field
The utility model relates to a kind of interface circuit, relates in particular a kind of serial ports RS232 interface circuit based on gps system.
Background technology
Data between each terminal transmit can adopt serial communication and two kinds of modes of parallel communication.Because serial communication mode has and uses that circuit is few, cost is low, particularly when remote transmission, avoided the inconsistent of many line characteristics and be widely adopted.RS232 is defined as a kind of single-ended standard that increases communication distance in the low rate serial communication, is most widely used a kind of serial line interface in PC and the communication industry.
GPS is GPS, because gps system has the characteristics such as multi-functional, easy and simple to handle, is widely applied.In present gps system, RS232 also is interfacing commonly used in.In existing RS232 interface circuit, its antijamming capability a little less than.In its use procedure, the intensity of antijamming capability is directly restricting the accuracy of signal transmission and the comfort level of use.
The utility model content
The utility model has overcome the deficiencies in the prior art, and a kind of RS232 interface circuit is provided, and this circuit is applicable in the interface of GPS device, and its antijamming capability is stronger.
For solving above-mentioned technical matters, the utility model by the following technical solutions:
A kind of serial ports RS232 interface circuit, it comprises MAX3238 chip and DB9 interface, the T1OUT of described MAX3238 chip links to each other with the RXD pin of DB9; The R1IN pin of described MAX3238 chip links to each other with the TXD pin of DB9, and the V+ pin of described MAX3238 chip connects a capacitor C 3, and the V-pin of described MAX3238 chip connects a capacitor C 4, and the other end of capacitor C 3, C4 ground connection simultaneously; Be connected to a capacitor C 1 between the C1+ of described MAX3238 chip and the C1-pin; Be connected to a capacitor C 2 between the C2+ of described MAX3238 chip and the C2-pin.
Further technical scheme is:
The capacitance of described capacitor C 1, C2, C3 and C4 is 100nf.
The equal ground connection of GND pin of the R2IN of described MAX3238 chip, T2IN, GND pin and DN9 interface.
The VCC pin of described MAX3238 chip connects+power supply of 3V.
The RS232 interface circuit adopts 2 line serial ports patterns in the utility model, utilizes the T1OUT of MAX3238 chip and the RXD pin that is directly connected to DB9 of R1IN port and the data that the TXD pin is realized RS232 to transmit.
In the utility model the T1IN pin of MAX3238 chip connect signal input port connect data terminal equipment /the RXD pin, the signal output port of R1OUT pin of MAX3238 chip connect data terminal equipment /the TXD pin.The periphery of MAX3238 has connect the electric capacity of 4 100nf, so that its absorbing peak pulse is effectively avoided the interference of spike effectively, the high frequency noise that it also can this chip of filtering produces cuts off the path that it is propagated by current supply circuit; Can prevent that also the noise that power supply carries consists of interference to circuit.
Compared with prior art, the beneficial effects of the utility model are: the periphery of MAX3238 chip of the present utility model is connected to 4 electric capacity, and it is absorbing peak pulse effectively, and the high frequency noise that the filtering chip produces disturbs, prevent the impact of power supply noise, its antijamming capability is increased.When GPS utilized this interface circuit, the stability that its signal transmits was improved, and antijamming capability strengthens.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is circuit connection diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Embodiment of the present utility model includes but not limited to the following example.
[embodiment]
A kind of serial ports RS232 interface circuit as shown in Figure 1, it comprises MAX3238 chip and DB9 interface, the T1OUT of MAX3238 chip links to each other with the RXD pin of DB9; The R1IN pin of MAX3238 chip links to each other with the TXD pin of DB9, and the V+ pin of MAX3238 chip connects a capacitor C 3, and the V-pin of MAX3238 chip connects a capacitor C 4, and the other end of capacitor C 3, C4 ground connection simultaneously; Be connected to a capacitor C 1 between the C1+ of MAX3238 chip and the C1-pin; Be connected to a capacitor C 2 between the C2+ of MAX3238 chip and the C2-pin.The capacitance of capacitor C 1, C2, C3 and C4 is 100nf.The equal ground connection of GND pin of the R2IN of MAX3238 chip, T2IN, GND pin and DN9 interface.The VCC pin of MAX3238 chip connects+power supply of 3V.
The RS232 interface circuit adopts 2 line serial ports patterns in the utility model, utilizes the T1OUT of MAX3238 chip and the RXD pin that is directly connected to DB9 of R1IN port and the data that the TXD pin is realized RS232 to transmit.
In the utility model the T1IN pin of MAX3238 chip connect signal input port connect data terminal equipment /the RXD pin, the signal output port of R1OUT pin of MAX3238 chip connect data terminal equipment /the TXD pin.The periphery of MAX3238 has connect the electric capacity of 4 100nf, so that its absorbing peak pulse is effectively avoided the interference of spike effectively, the high frequency noise that it also can this chip of filtering produces cuts off the path that it is propagated by current supply circuit; Can prevent that also the noise that power supply carries consists of interference to circuit.
Be as mentioned above embodiment of the present utility model.The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection domain of the present utility model.
Claims (4)
1. serial ports RS232 interface circuit based on gps system, it is characterized in that: it comprises MAX3238 chip and DB9 interface, the T1OUT of described MAX3238 chip links to each other with the RXD pin of DB9; The R1IN pin of described MAX3238 chip links to each other with the TXD pin of DB9, and the V+ pin of described MAX3238 chip connects a capacitor C 3, and the V-pin of described MAX3238 chip connects a capacitor C 4, and the other end of capacitor C 3, C4 ground connection simultaneously; Be connected to a capacitor C 1 between the C1+ of described MAX3238 chip and the C1-pin; Be connected to a capacitor C 2 between the C2+ of described MAX3238 chip and the C2-pin.
2. the serial ports RS232 interface circuit based on gps system according to claim 1, it is characterized in that: the capacitance of described capacitor C 1, C2, C3 and C4 is 100nf.
3. the serial ports RS232 interface circuit based on gps system according to claim 1 is characterized in that: the equal ground connection of GND pin of the R2IN of described MAX3238 chip, T2IN, GND pin and DN9 interface.
4. the serial ports RS232 interface circuit based on gps system according to claim 1 is characterized in that: the VCC pin of described MAX3238 chip connects+and the power supply of 3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220522506 CN202795357U (en) | 2012-10-12 | 2012-10-12 | GPS (Global Position System)-based serial RS232 (Recommend Standard 232) interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220522506 CN202795357U (en) | 2012-10-12 | 2012-10-12 | GPS (Global Position System)-based serial RS232 (Recommend Standard 232) interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202795357U true CN202795357U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220522506 Expired - Fee Related CN202795357U (en) | 2012-10-12 | 2012-10-12 | GPS (Global Position System)-based serial RS232 (Recommend Standard 232) interface circuit |
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| CN (1) | CN202795357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103729325A (en) * | 2012-10-12 | 2014-04-16 | 成都众易通科技有限公司 | Serial port RS232 interface circuit based on GPS system |
-
2012
- 2012-10-12 CN CN 201220522506 patent/CN202795357U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103729325A (en) * | 2012-10-12 | 2014-04-16 | 成都众易通科技有限公司 | Serial port RS232 interface circuit based on GPS system |
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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: 20130313 Termination date: 20131012 |