CN110392091A - A/D capture card based on NB-iot technology - Google Patents
A/D capture card based on NB-iot technology Download PDFInfo
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Abstract
The present invention provides a kind of A/D capture cards based on NB-iot technology, including NB-iot communication module and A/D signal acquisition module；NB-iot communication module includes: the first power circuit, is that each section of NB-iot communication module is powered；485 communication modules are communicated with A/D signal acquisition module；BC95 telecommunication circuit, for being sent out the data of acquisition；First singlechip signal processing circuit for receiving the signal from 485 communication modules, and is transmitted to BC95 telecommunication circuit to be sent out the data of acquisition；A/D signal acquisition module includes: second source circuit, is that each section of A/D signal acquisition module is powered；A/D Acquisition Circuit, including several A/D conversion circuits, for the analog signals of different sensor inputs to be converted to digital quantity signal, the data of acquisition are transmitted to NB-iot communication module by 485 telecommunication circuits；Second singlechip signal processing circuit, for handling the digital quantity signal from A/D Acquisition Circuit and being sent to NB-iot communication module by 485 telecommunication circuits.
Description
Technical field
The present invention relates to internet of things equipment technical field, in particular to a kind of A/D capture card based on NB-iot technology.
Background technique
With the rise of internet of things concept, technology of Internet of things gradually starts many fields applied to the modern life.According to
The definition of International Telecommunication Union (ITU), technology of Internet of things both mainly solve article and article (Thing to Thing, T2T), people
With article (Human to Thing, H2T), interconnection between person to person (Human to Human, H2H).
It is compared with traditional internet, Internet of Things has distinct feature: firstly, it is answering extensively for various cognition technologies
With.The multiple types sensor that magnanimity can be disposed on Internet of Things, by the acquisition environmental information of certain frequency periodicity, constantly
More new data.Secondly, it is a kind of Ubiquitous Network established on the internet.The important foundation and core of technology of Internet of things are still
It is internet, by various wired and wireless networks and the Internet converged, the information of object is real-time and accurately passed.Also
Have, Internet of Things not only provides only the connection of sensor, itself also has the ability of Intelligent treatment, can implement intelligence to object
It can control.
Internet of Things combines sensor and Intelligent treatment, using the various intellectual technologies such as cloud computing, pattern-recognition, expands
Its application field.Significant data are analyzed, process and handle out, from the massive information that sensor obtains to adapt to different use
The different demands at family find new application field and application model.
Therefore, on the one hand economic benefit can be improved in Internet of Things, greatlys save cost；It on the other hand can be global economy
Recovery provide technology dynamics.Internet of Things is all explored in investment huge fund further investigation by the U.S., European Union etc..Also height is being closed in China
Note, the research for paying attention to Internet of Things.In existing technical foundation, a multiduty Internet of Things communication equipment is designed, is realized low
Power consumption characteristics are used with being suitable for humiture collection, air pressure acquisition and other aspects, can be realization multi-group data with the period
Efficiently monitoring provides effective technical support, while can also be with the development and popularization and use of power-assisted technology of Internet of things.
Summary of the invention
The purpose of the present invention is to provide a kind of A/D capture cards based on NB-iot technology, provide a be mostly used to realize
The Internet of Things communication equipment on way realizes low power consumption characteristic, is used with being suitable for humiture collection, air pressure acquisition and other aspects.
To achieve the above object, the present invention provides a kind of A/D capture card based on NB-iot technology, including NB-iot are logical
Believe module and A/D signal acquisition module；The NB-iot communication module includes:
First power circuit, for each section power supply for NB-iot communication module；
485 communication modules, for being communicated with the A/D signal acquisition module；
BC95 telecommunication circuit, for being sent out the data of acquisition；
First singlechip signal processing circuit for receiving the signal from 485 communication module, and is transmitted to described
BC95 telecommunication circuit is to be sent out the data of acquisition；
The A/D signal acquisition module includes:
Second source circuit, for each section power supply for A/D signal acquisition module；
A/D Acquisition Circuit, including several A/D conversion circuits, for turning the analog signals of different sensor inputs
It is changed to digital quantity signal；
485 telecommunication circuits, for the data of acquisition to be transmitted to the NB-iot communication module；
Second singlechip signal processing circuit, for handling the digital quantity signal from the A/D Acquisition Circuit and passing through
485 telecommunication circuit is sent to the NB-iot communication module.
Preferably, the second singlechip signal processing circuit includes STC15W4Kxxxx single-chip microcontroller and peripheral circuit,
In, MCU_TX, MCU_RX are the serial ports 3 of single-chip microcontroller, are connected as communication interface with 485 telecommunication circuit and are responsible for the hair of data
It send and receives, the P1 mouthfuls of collected signals of responsible reception A/D Acquisition Circuit institute that are connected with A/D Acquisition Circuit.
Preferably, the A/D Acquisition Circuit includes analog switch, A/D conversion chip and peripheral circuit, the analog switch
For carrying out the channel selecting of input signal, the analog input end of the A/D conversion chip and the output end of the analog switch
It is connected, for obtaining the analog signals of input.
Preferably, 485 telecommunication circuit include 485 chips, optocoupler, power isolation transformer, electromagnetic digital signal every
Off-chip piece and peripheral circuit, the power isolation transformer for realizing power supply isolation and for 485 chip power, it is described
Electromagnetic digital signal isolation chip transmits for realizing the signal of high bit rate, and the optocoupler is for making 485 chip
Energy end is isolated.
Preferably, the second source circuit includes: LM2596 switching power source chip and peripheral circuit.
Preferably, the first singlechip signal processing circuit includes STM32L151C8T6 single-chip microcontroller and peripheral circuit,
MCU_TX2, MCU_RX2 are the serial ports 2 of single-chip microcontroller, are responsible for communicating between the BC95 telecommunication circuit；MCU_TX3,MCU_RX3
For the serial ports 3 of single-chip microcontroller, for receiving the data that the A/D signal acquisition module is sent out by 485 communication module.
Preferably, the BC95 telecommunication circuit includes BC95 chip, SIM card and RF antenna, the BC95 chip is for obtaining
It fetches the signal from the first singlechip signal processing circuit and controls the RF antenna and be sent out signal, the BC95 core
Piece accesses network by the SIM card.
Preferably, 485 communication module include 485 chips, port 485A, 485B of 485 chip respectively with institute
The corresponding ports for stating A/D signal acquisition module are communicated.
Preferably, first power circuit includes switching power source chip, input voltage DC12V-DC24V, output electricity
Pressure is DC5V, output electric current is 1A.
The invention has the following advantages:
Multiduty Internet of Things communication equipment is realized, the characteristic of low-power consumption is also achieved；
It can be used for humiture collection, air pressure acquisition and otherwise use；
It can be realized multi-group data while monitoring；
It is easy to extend other functions；
It can be realized many kinds of parameters while detecting.
Detailed description of the invention
Fig. 1 is that the present invention is based on the A/D capture card entirety composition schematic diagrams of NB-iot technology；
Fig. 2 is the second singlechip signal processing circuit figure of A/D signal acquisition module；
Fig. 3 is the A/D Acquisition Circuit figure of A/D signal acquisition module；
Fig. 4 is 485 telecommunication circuit figures of A/D signal acquisition module；
Fig. 5 is the power circuit diagram of A/D signal acquisition module；
Fig. 6 is NB-iot communication module first singlechip signal processing circuit figure；
Fig. 7 is the BC95 telecommunication circuit figure of NB-iot communication module；
Fig. 8 is SIM card circuit diagram；
Fig. 9 is 485 communication module figures of NB-iot communication module；
Figure 10 is the first power circuit diagram of NB-iot communication module.
Specific embodiment
Below with reference to attached drawing of the invention, the technical scheme in the embodiment of the invention is clearly and completely described
And discussion, it is clear that as described herein is only a part of example of the invention, is not whole examples, based on the present invention
In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work
Example, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, make by taking specific embodiment as an example below in conjunction with attached drawing further
It illustrates, and each embodiment does not constitute the restriction to the embodiment of the present invention.
Present embodiments provide a kind of A/D capture card based on NB-iot technology, including NB-iot communication module and A/D letter
Number acquisition module；The NB-iot communication module includes:
First power circuit, for each section power supply for NB-iot communication module；
485 communication modules, for being communicated with the A/D signal acquisition module；
BC95 telecommunication circuit, for being sent out the data of acquisition；
First singlechip signal processing circuit for receiving the signal from 485 communication module, and is transmitted to described
BC95 telecommunication circuit is to be sent out the data of acquisition；
The A/D signal acquisition module includes:
Second source circuit, for each section power supply for A/D signal acquisition module；
A/D Acquisition Circuit, including several A/D conversion circuits, for turning the analog signals of different sensor inputs
Digital quantity signal is changed to,
485 telecommunication circuits, for the data of acquisition to be transmitted to the NB-iot communication module；
Second singlechip signal processing circuit, for handling the digital quantity signal from the A/D Acquisition Circuit and passing through
485 telecommunication circuit is sent to the NB-iot communication module.
Refering to what is shown in Fig. 1, in a particular embodiment, the input signal of A/D signal acquisition module is 16 tunnel analog quantitys, by gas
Pressure sensor generates, voltage 0-5V.The analog signal of input is sent to list after converting bit digital quantity by MCP3421A/D converter
The signal received is converted to actual pressure value by calculating by piece machine, single-chip microcontroller, 485 hairs then connected by serial ports 3
Give NB-iot communication module.
It is attached between NB-iot communication module and A/D signal acquisition module by 485, the signal received passes through string
Mouth is sent to stm32 single-chip microcontroller.Data are carried out by serial ports between BC95-B5 chip and stm32 single-chip microcontroller to send and receive,
The signal that 485 circuits receive is sent to BC95-B5 chip by serial ports 2 by stm32 single-chip microcontroller, and BC95-B5 is by reading SIM
Then information realization network savvy in card sends cloud by RF antenna for the signal received from stm32 single-chip microcontroller.
As shown in Fig. 2, above-mentioned second singlechip signal processing circuit includes STC15W4Kxxxx single-chip microcontroller and periphery electricity
Road.Here it uses STC15W4K32S4 single-chip microcontroller as signal processor A/D signal acquisition module, is mainly responsible for and A/D is adopted
The signal collected handle and sent by serial ports.Wherein, MCU_TX, MCU_RX are the serial ports 3 of single-chip microcontroller, as logical
Letter interface is connected with 485 telecommunication circuit is responsible for sending and receiving for data, the P1 mouthfuls of responsible receptions that are connected with A/D Acquisition Circuit
The collected signal of A/D Acquisition Circuit institute.In addition, JP6 is program download interface, LED is communication indicator light, when there is data transmission
It goes out to be that indicator light lights, then indicator light extinguishes when no data is sent.
The main function of A/D Acquisition Circuit is that the analog signal for generating baroceptor is converted to digital signal, and incites somebody to action
Signal after conversion leads to iic bus and is transferred to single-chip microcontroller.Specifically, above-mentioned A/D Acquisition Circuit includes analog switch, A/D turns
Change chip and peripheral circuit, analog switch is used to carry out the channel selecting of input signal, the analog input end of A/D conversion chip with
The output end of the analog switch is connected, for obtaining the analog signals of input.As shown in figure 3, JP2 is signal input part,
ZD1, ZD2 diode are protection diode, for the excessively high damage original part of input voltage.Here analog switch is 74HC4052,
It is that an analog switch is selected on 2 tunnels four, can has A, B, FN to carry out the selection in channel.Shown in logical relation table 1:
1 74HC4052 channel selecting logical relation table of table
Wherein, the EN ground connection of 74HC4052, A, B connect P26, P27 pin of single-chip microcontroller, and single-chip microcontroller passes through output low and high level
To change the selection of input channel.
Here A/D conversion chip is MCP3421, is one 18 A/D conversion chips, which is single channel low noise
Sound, high-precision, Differential Input.MCP3421 pin function is as shown in table 2:
2 MCP3421 pin function table of table
| MCP3421 | Symbol | Explanation |
| 1 | Vin+ | Positive differential analog input pin |
| 2 | Vss | Grounding pin |
| 3 | SCL | The serial clock input pin of IIC interface |
| 4 | SDA | IIC interface bi-directional serial data pin |
| 5 | VDD | Positive electricity source pin |
| 6 | Vin- | Minus tolerance divides analog input pin |
Positive differential analog input pin Vin+ connects the signal output end of 74HC4052, and minus tolerance divides analog input pin Vin- to be grounded,
Chip 5V power supply.Single-chip microcontroller is connected with MCP3421 by software simulation TTC interface and reads the data in MCP3421.Single-chip microcontroller
Low and high level by changing P26, P27 pin is successively read channel 1,5,9,13；2,6,10,14；3,7,11,14；4,8,12,
16 A/D conversion value；Then the A/D value read is converted into actual atmospheric pressure value, and is arranged again according to channel 1-16
Then sequence is sent data by the serial ports 3 of single-chip microcontroller.
A/D signal acquisition module is communicated by the way of isolation 485 with the external world.With reference to Fig. 4,485 telecommunication circuit packets
Include 485 chips, optocoupler, power isolation transformer, electromagnetic digital signal isolation chip and peripheral circuit.Power isolation transformer is used
It powers in the isolation for realizing power supply and for 485 chips, power isolation transformer here uses B0505S, turns 5V's for a 5V
Power isolation transformer.Electromagnetic digital signal isolation chip transmits for realizing the signal of high bit rate, uses here
ADUM3201 is a kind of electromagnetic digital signal isolation chip, and compared with general optical coupling isolation method, ADUM3201 has more
The signal transmission of more high bit rate may be implemented in high reliability.Optocoupler is used to that the enable end of 485 chips to be isolated, this
In EL357 be optocoupler.Wherein, VD1 diode is the protection diode of 485 buses, and signal is avoided to receive extraneous interference.It should
The main function of 485 telecommunication circuits is that the TTL signal of microcontroller serial port output is converted to 485 signals, it can be achieved that relatively remote
Signal transmission, using semiduplex communication mode.
Second source circuit includes: LM2596 switching power source chip and peripheral circuit.Specifically, as shown in figure 5, A/D believes
The power circuit of number acquisition module exports electric current using LM2596 switching power source chip, input voltage DC12V-DC24V
3A, output voltage DC5V.VD2 is anti-reverse diode, prevents power supply is reversed from burning out original part.
In the present embodiment, the A/D signal acquisition module course of work is as follows: then progress program initialization first is adopted
Collect AD data, then judge whether to inquire data, if so, then sending data.
As shown in fig. 6, the first singlechip signal processing circuit in the present embodiment include STM32L151C8T6 single-chip microcontroller and
Peripheral circuit.STM32L151C8T6 chip is a member in super low-power consumption system, STM32 chip family class.Its function includes: data
Processing, regularly sends, and Data Detection alarm, the big function of condition prompting etc. 4, is the main logic unit of the part NB-IOT.Wherein,
MCU_TX2, MCU_RX2 are the serial ports 2 of single-chip microcontroller, are responsible for communicating between BC95-BC chip；MCU_TX3, MCU_RX3 are single
The serial ports 3 of piece machine, the data sent out for the interface A/D signal acquisition module by 485 communication modules.PA13,
PA14 is SWD interface, debugging and burning for STM SCM program.MCU_TX1, MCU_RX1 are the string of stm32 single-chip microcontroller
Mouth 1, the communication and debugging that are used between PC machine and program are downloaded.PB8, PB9 are MCU and network state indicator light, are used for
The only working condition of STM32 single-chip microcontroller and BC95-B5 chip.
As shown in Figure 1, BC95 telecommunication circuit includes BC95 chip, SIM card and RF antenna, the BC95 chip is for obtaining
Signal from first singlechip signal processing circuit simultaneously controls RF antenna and is sent out signal, and the BC95 chip passes through described
SIM card accesses network.BC95 is the NB-IoT series module of a high-performance, low-power consumption, is assisted by NB-IoT radio communication
It discusses (3GPP Re1-13), BC95 module can be established with the infrastructure device of network operator and be communicated.
With specific reference to shown in Fig. 7,15 feet of BC95 chip are resetting pin, and the PB0 of single-chip microcontroller is met by opener driving circuit
Mouthful, when PB0 is high level, RESET is low level at this time, and the reset of module can be realized in the time of delay 0.2S or so.VBAT
For the power pins of BC95 chip, power supply VBAT input voltage range is 3.1V~4.2V, representative value 3.6V.Module passes work in number
In work, it is ensured that power supply falls operating voltage 3.1V minimum not less than module.In order to ensure better power supply power supply performance, close
The tantalum capacitor and 100nF, 100pF and 22pF of the 100uF of a module VBAT input terminal low ESR (ESR=0.7 Ω) in parallel
Filter capacitor.29, No. 30 feet of chip are that the main serial ports of BC95 is connected with the serial ports 2 of stm32 single-chip microcontroller, for receiving
The data that stm32 is sent.Main serial ports can be used for AT command communication and data transmission, baud rate 9600bps.It can also be used in solid
Part upgrading, the baud rate of firmware upgrade are 115200bps.The main serial ports is equal under Active mode, Idle mode and PSM mode
It can work.53 feet of BC95 chip are RF antennal interface, and RF antennal interface impedance is 50 Ω.It, will be final with the transmission of signal
Data are sent to cloud.
The 38-42 foot of chip is that usim card dedicated pin is connected with external usim card, and support module accesses usim card.It should
USIM interface supports the function of 3GPP specification.External usim card only supports 3.0V power supply by the power supply power supply of inside modules.It mentions
Network savvy is realized with BC-95 communication chip circuit cooperation for the function of SIM card identification.SIM card circuit diagram is as shown in Figure 8:
VCC is usim card power supply, is provided by the USIM_VDD of BC95 chip；GND be usim card exclusively；RST is multiple for usim card
Position foot, CLK are usim card clock pins, the data line that DATA is usim card；Respectively at USIM_RST, USIM_ of BC95 chip
CLK, USIM_DATA are connected.Need to connect 22 ohm of resistance between module and external usim card to inhibit spuious EMI,
Enhance ESD protection.In USIM_DATA, USIM_VDD, parallel connection 33pF capacitor is penetrated for filtering out on USIM_CLK and USIM_RST line
Frequency interferes.
485 communication modules of the present embodiment include 485 chips, and port 485_A, 485_B of 485 chips believe with A/D respectively
The corresponding ports of number acquisition module are communicated.Refering to what is shown in Fig. 9, being worked here using single power supply+3.3V, rated current is
300 μ A, using half duplex communication mode.It is completed the function of Transistor-Transistor Logic level and 485 level conversions.In the design, have reached
One connects more purposes, and meets the purpose of relatively long distance communication.485_A, 485_B 485_ with A/D signal acquisition module respectively
A, 485_B is connected.NBiot communication module is host, and A/D signal acquisition module is slave, and STM32 single-chip microcontroller is sent by 485
It receives instruction and gives A/D signal acquisition module, A/D signal acquisition module judges whether it is the machine address, if it is sends data.
The data received are sent to the serial ports 3 of stm32 single-chip microcontroller by NBiot communication module.
In addition, the first above-mentioned power circuit includes switching power source chip, input voltage DC12V-DC24V, output electricity
Pressure is DC5V, output electric current is 1A.With reference to Figure 10, power circuit uses TD1509P5 switching power source chip, input voltage
DC12V-DC24V, output voltage DC5V, electric current 1A；Single-chip microcontroller, 485, indicator light circuit are powered by XC6206, XC6206 input
Voltage DC5V, output voltage DC3.3V, electric current 300mA.Wherein, F1 is fuse, D3, D4 anti-reverse diodes, protection electricity
Road prevents power supply reversed, and D5 is freewheeling diode.VD1, VD2 are reduction voltage circuit, single diode drop about 0.7V, by 5V power supply
3.6V is dropped to power to BC95-B5 chip.
In the present embodiment, NB-IOT communication module program operational process is as follows: then progress program initialization first is inquired
Capture card acquires data, then judges whether capture card data transfinite, and then judge whether to alarm, such as overload alarm, then data are sent out
It send and once periodically returns 0, further determine whether to reach pre- specified time 30 minutes if non-overload alarm, if so, then data are sent
Primary timing is zeroed.Wherein, program initialization mainly returns 0 by 485 communication standard positions, and back off timer initializes, LED light
Initialization, serial ports 1 (BC95 communication serial port) initialization, serial ports 2 (485 communication) initialization, serial ports 3 (debugging serial ports) initialization,
8 parts such as the initialization of timer 4 and BC-95 initialization composition.When inquiring capture card acquisition data, NB-IOT communication module
By different orders, data are inquired to capture card.When judging whether detection data transfinites, by sending back to data to capture card
It calculates, judges whether to transfinite；Test portion has used previous testing result to compare, and prevents repetition of alarms；Judge whether
When alarm, when time or alarm criteria, one of them meets alarm.
A/D signal acquisition module in the present embodiment can be connect with multiple and different or identical sensor, to acquire it
Data, those skilled in the art can be modified as needed and extend use.Capture card provided in this embodiment is realized
Multiduty Internet of Things communication equipment, also achieves the characteristic of low-power consumption, can be used for humiture collection, air pressure acquisition and its
Use in terms of him.The AD detection mouth on up to 64 tunnels, can be realized multi-group data while monitoring；Present its of the capture card is mainly transported
Used in the Pressure monitoring of rail traffic, future can also extend other functions, realize while detecting.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those skilled in the art in the technical scope disclosed by the present invention, to deformation or replacement that the present invention is done, should be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the scope of protection of the claims.
Claims (9)
1. a kind of A/D capture card based on NB-iot technology, which is characterized in that adopted including NB-iot communication module and A/D signal
Collect module；The NB-iot communication module includes:
First power circuit, for each section power supply for NB-iot communication module；
485 communication modules, for being communicated with the A/D signal acquisition module；
BC95 telecommunication circuit, for being sent out the data of acquisition；
First singlechip signal processing circuit for receiving the signal from 485 communication module, and is transmitted to the BC95
Telecommunication circuit is to be sent out the data of acquisition；
The A/D signal acquisition module includes:
Second source circuit, for each section power supply for A/D signal acquisition module；
A/D Acquisition Circuit, including several A/D conversion circuits, for being converted to the analog signals of different sensor inputs
Digital quantity signal；
485 telecommunication circuits, for the data of acquisition to be transmitted to the NB-iot communication module；
Second singlechip signal processing circuit, for handling the digital quantity signal from the A/D Acquisition Circuit and by described
485 telecommunication circuits are sent to the NB-iot communication module.
2. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that the second singlechip
Signal processing circuit includes STC15W4Kxxxx single-chip microcontroller and peripheral circuit, wherein MCU_TX, MCU_RX are the serial ports of single-chip microcontroller
3, it is connected as communication interface with 485 telecommunication circuit and is responsible for sending and receiving for data, P1 mouthfuls is connected with A/D Acquisition Circuit
It is responsible for receiving the collected signal of A/D Acquisition Circuit institute.
3. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that the A/D Acquisition Circuit
Including analog switch, A/D conversion chip and peripheral circuit, the analog switch is used to carry out the channel selecting of input signal, institute
The analog input end for stating A/D conversion chip is connected with the output end of the analog switch, for obtaining the analog signals of input.
4. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that 485 telecommunication circuit
Including 485 chips, optocoupler, power isolation transformer, electromagnetic digital signal isolation chip and peripheral circuit, the isolated from power becomes
Depressor for realizing power supply isolation and for 485 chip power, the electromagnetic digital signal isolation chip is for realizing height
The signal of baud rate transmits, and the optocoupler is for being isolated the enable end of 485 chip.
5. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that the second source electricity
Road includes: LM2596 switching power source chip and peripheral circuit.
6. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that the first singlechip
Signal processing circuit includes STM32L151C8T6 single-chip microcontroller and peripheral circuit, and MCU_TX2, MCU_RX2 are the serial ports 2 of single-chip microcontroller,
It is responsible for communicating between the BC95 telecommunication circuit；MCU_TX3, MCU_RX3 are the serial ports 3 of single-chip microcontroller, for passing through described 485
Communication module receives the data that the A/D signal acquisition module is sent out.
7. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that the BC95 communication electricity
Road includes BC95 chip, SIM card and RF antenna, and the BC95 chip is for obtaining from the first singlechip signal processing electricity
The signal on road simultaneously controls the RF antenna and is sent out signal, and the BC95 chip passes through the SIM card and accesses network.
8. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that 485 communication module
Including 485 chips, port 485_A, 485_B of 485 chip respectively with the corresponding ports of the A/D signal acquisition module into
Row communication.
9. the A/D capture card according to claim 1 based on NB-iot technology, which is characterized in that the first power supply electricity
Road includes switching power source chip, and input voltage DC12V-DC24V, output voltage DC5V, output electric current are 1A.
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