CN208314761U - A kind of interface conversion plate - Google Patents

Abstract

The utility model relates to a kind of interface conversion plates, including multiple 485 interfaces, interface conversion circuit and main control chip, the 485 interface connection has the communication module of 485 buses, the interface conversion circuit is connect with 485 interfaces, the interface conversion circuit is also connect with main control chip, and the main control chip is connect with TTL interface.The interface conversion plate of the utility model can be realized the communication between multiple 485 interfaces and a TTL interface, avoids the problem that multiple interface conversion plates is needed to be communicated between multiple sensors and control panel, economizes on resources, and be easily installed.

Description

A kind of interface conversion plate

Technical field

The utility model relates to the technical fields of electronic circuit, are concretely a kind of interface conversion plates.

Background technique

With the continuous development of contemporary electronic technology and universal, many sensors have 485 buses, but do not have on control panel Dedicated 485 interface and only TTL interface when, it is intermediate just to need an interface conversion plate.Traditional approach is 485 interfaces pair A TTL interface is answered to be communicated, multiple 485 interfaces and multiple TTL interfaces carry out one-to-one communication.For example, in lamp stand Upper installation such as atmosphere, temperature, humidity, illumination sensor, and these sensors cannot be completely integrated in a device, this When will complete the information exchange between sensor and control panel with two or more interface conversion plates.

Utility model content

For overcome the deficiencies in the prior art, the purpose of the utility model is to provide a kind of interface conversion plates, solve multiple Interface conversion plate is just able to achieve the communication issue between multiple sensors and control panel.

The technical scheme adopted by the utility model to solve the technical problem is as follows:

A kind of interface conversion plate, including multiple 485 interfaces, interface conversion circuit and main control chip, the 485 interface connection Communication module with 485 buses, the interface conversion circuit are connect with 485 interfaces, the interface conversion circuit also with master control Chip connection, the main control chip are connect with TTL interface.

Further, the interface conversion circuit includes conversion chip and peripheral circuit, and the conversion chip realizes 485 signals With the conversion of TTL signal.

Further, the main control chip is single-chip microcontroller.

Further, the model STM8 of the single-chip microcontroller.

It further, further include external controlled circuit for lamp, the external controlled circuit for lamp includes relay, one end of relay and master Chip connection is controlled, the other end is connect with lamp.

It further, further include power circuit, the power circuit provides working power for each section.

It further, further include power circuit, the power circuit provides working power for each section.

The beneficial effects of the utility model are: the interface conversion plate of the utility model can be realized multiple 485 interfaces and one Communication between a TTL interface avoids the problem that multiple interface conversion plates is needed to be communicated between multiple sensors and control panel, It economizes on resources, and is easily installed.

Detailed description of the invention

Specific embodiment of the present utility model is further described with reference to the accompanying drawing:

Fig. 1 is the principles of the present invention block diagram；

Fig. 2 is the circuit diagram of 12V power circuit；

Fig. 3 is the circuit diagram of 5V power circuit；

Fig. 4 is the circuit diagram of 3.3V power circuit；

Fig. 5 is the circuit diagram of main control chip；

Fig. 6 is the circuit diagram of interface conversion circuit；

Fig. 7 is the circuit diagram of external controlled circuit for lamp；

Fig. 8 is the circuit diagram of power circuit peripheral circuit；

Fig. 9 is the circuit diagram of main control chip crystal oscillating circuit；

Figure 10 is the circuit diagram of 3.3V electric source filter circuit.

Specific embodiment

In order to make those skilled in the art better understand the scheme of the utility model, practical to this below in conjunction with attached drawing Technical solution in new embodiment is clearly and completely described, it is clear that described embodiment is only the utility model The embodiment of a part, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art The model of the utility model protection all should belong in the every other embodiment obtained without creative efforts It encloses.

Referring to Fig.1, a kind of interface conversion plate, including multiple 485 interfaces, interface conversion circuit and main control chip, described 485 Interface connection has the communication module of 485 buses, and the interface conversion circuit is connect with 485 interfaces, the interface conversion circuit It is also connect with main control chip, the main control chip is connect with TTL interface.The main control chip processing is from 485 buses through interface TTL signal after conversion circuit conversion, and processing result is transmitted to host computer.

Referring to Fig. 2,3,4, the utility model further includes power circuit, and the power circuit provides work electricity for each section Source.Three output ends of the power circuit are respectively as follows: the end TWE_L, export 12V supply voltage；The end F1, output 5V power supply electricity Pressure；The end TH_TH exports 3.3V supply voltage.The corresponding input terminal in the end TWE_L is mains electricity input end, and alternating current is through transformer After the processing of the elements such as T1,12V DC voltage output is converted to；The corresponding input terminal in the end F1 is the end TWE_L-1, referring to Fig. 8, 12V supply voltage of the end the TWE_L-1 input after zener diode D3 pressure stabilizing is converted to 5V DC voltage after lowering and stabilizing blood pressure Output；The corresponding input terminal in the end TH_TH is that the end F1 is converted to 3.3V direct voltage output after being depressured chip voltage.Ginseng According to Figure 10,3.3V power filter is played the role of through capacity earth in the end TH_TH.

Referring to Fig. 5, the main control chip is single-chip microcontroller, the model STM8 of the single-chip microcontroller.Referring to Fig. 9, the end OSC_I and The end OSC_O connects external crystal oscillation circuit, provides oscillating impulse for single-chip microcontroller STM8；Single-chip microcontroller STM8 power end and power circuit The connection of the end TH_TH, inputs 3.3V supply voltage；The end RX1, TX1 of single-chip microcontroller STM8 output end corresponding with interface conversion circuit Mouthful connection, the end RX1, TX1 connect TTL interface, I/O port RE1, DE1 of single-chip microcontroller STM8, RE2, DE2, RE3, DE3, RE4, The output port connection corresponding with interface conversion circuit of the end DE4；The end ON/OFF of single-chip microcontroller STM8 also with external controlled circuit for lamp pair The port connection answered.

Referring to Fig. 6, the interface conversion circuit includes conversion chip and peripheral circuit, and the conversion chip is by changing electricity Realize the conversion of 485 signals and TTL signal in the direction of pressure.0V voltage can be transformed into -6V~-2V electricity by the conversion chip Pressure, is changed into 2V~6V voltage for 5V voltage, and the conversion of two signals is realized with the variation of voltage.The confession of interface conversion circuit Electric end and the end TH_TH of power circuit connect, and input 3.3V supply voltage；The input terminal of interface conversion circuit and 4 485 interfaces 4 tunnel, the 485 bus connection of connection, the input terminal of 4 tunnel, 485 bus respectively correspond the end P13, the end P14, the end P15 and P16 in figure End, the output end of interface conversion circuit and the corresponding port the single-chip microcontroller STM8 of main control module connect, and carry out the transmission of signal.

Referring to Fig. 7, the utility model further includes external controlled circuit for lamp, and the external controlled circuit for lamp includes relay, relay One end of device and the end I/O port ON/OFF of main control chip connect, and the other end is connect with lamp, realizes the control to lamp switch.The master Control the control that chip receives the external controlled circuit for lamp switch lamp of signal progress of host computer.

The utility model is applied when on lamp stand, atmosphere, temperature, humidity, illumination sensor have 485 buses, 4 485 bus of road is attached respectively with 4 485 interfaces, and the input terminal of interface conversion circuit is connect with 4 tunnel, 485 bus, converts core 485 signals are converted to TTL signal by piece, and the output end of interface conversion circuit is connect with the I/O port of single-chip microcontroller STM8, single-chip microcontroller TTL signal of the STM8 processing from 485 buses after interface conversion circuit is converted, and processing result is transmitted to by TTL interface Host computer；Meanwhile the signal of single-chip microcontroller STM8 reception host computer passes through the control that external controlled circuit for lamp carries out switch lamp.This is practical The quantity of novel 485 interface can be adjusted according to the quantity of peripheral sensor and the I/O port quantity of single-chip microcontroller STM8.

In conclusion above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng The utility model is described in detail according to previous embodiment, those skilled in the art should understand that；It is still It can modify the technical solutions described in the foregoing embodiments, or equally be replaced to being wherein no lack of technical characteristic It changes, and these are modified or replaceed, the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution Spirit and scope.

Claims (6)

1. a kind of interface conversion plate, it is characterised in that: described including multiple 485 interfaces, interface conversion circuit and main control chip The connection of 485 interfaces has the communication module of 485 buses, and the interface conversion circuit is connect with 485 interfaces, the interface conversion electricity Road is also connect with main control chip, and the main control chip is connect with TTL interface.

2. a kind of interface conversion plate according to claim 1, it is characterised in that: the interface conversion circuit includes conversion core Piece and peripheral circuit, the conversion chip realize the conversion of 485 signals and TTL signal.

3. a kind of interface conversion plate according to claim 1, it is characterised in that: the main control chip is single-chip microcontroller.

4. a kind of interface conversion plate according to claim 3, it is characterised in that: the model STM8 of the single-chip microcontroller.

5. a kind of interface conversion plate according to claim 1, it is characterised in that: it further include external controlled circuit for lamp, it is described outer Portion's controlled circuit for lamp includes relay, and one end of relay is connect with main control chip, and the other end is connect with lamp.

6. a kind of interface conversion plate according to claim 1 or 5, it is characterised in that: it further include power circuit, the power supply Circuit provides working power for each section.