CN109142321A - A kind of signal control and acquisition system and method for laser induced breakdown spectrograph - Google Patents
A kind of signal control and acquisition system and method for laser induced breakdown spectrograph Download PDFInfo
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- CN109142321A CN109142321A CN201810864094.5A CN201810864094A CN109142321A CN 109142321 A CN109142321 A CN 109142321A CN 201810864094 A CN201810864094 A CN 201810864094A CN 109142321 A CN109142321 A CN 109142321A
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention relates to a kind of signal controls and acquisition system and method, including Laser Power Devices control unit, signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit, negative high voltage acquisition control unit and communication interface converting unit for laser induced breakdown spectrograph；Laser Power Devices control unit exports synchronous triggering signal；Signal integration delays time to control unit triggers output multi-pass trace integral time delayed signal by the synchronous triggering signal；Signal integration amplifying unit is controlled by multi-pass trace integral time delayed signal and carries out integral amplification to the output signal of multichannel photodetector；Data acquisition process unit is acquired, stores, is packaged and transmits to amplified signal is integrated；Negative high voltage acquisition control unit is monitored the negative high voltage of multichannel photodetector.The present invention realizes each channel signal integral delay time, integral amplifies, negative high voltage is continuously adjusted independently, in high precision, improves the accuracy of each Channel elements measurement.
Description
Technical field
The invention belongs to laser induced breakdown spectroscopy field, in particular to a kind of letter for laser induced breakdown spectrograph
Number control and acquisition system and method, realize and carry out to the output signal of laser induced breakdown spectrograph multichannel photodetector
Accurate control and high speed acquisition.
Background technique
Laser induced breakdown spectrograph is generated using pulse type laser as excitation light source by the way that laser is gathered sample surfaces
Plasma, plasma control through beam splitting system light splitting, photodetector detection and signal after issuing characteristic spectrum and acquire system
After system acquisition, computer is transferred data to, obtain sample to be tested characteristic element afterwards through computer analysis and processing and its is divided
Cloth information.Since the duration that laser action to sample surfaces generates plasma is shorter, while exciting initial time signal
And unstable and background signal is higher, therefore optimal spectral intensity and signal-to-background ratio in order to obtain, needs to carry out acquisition time
Accurate delays time to control；Characteristic spectral line optical signal after light splitting is converted to electric signal by photodetector, is applied to photodetection
The size of negative high voltage on device will directly affect the amplification factor and instrument signal to noise ratio of photodetector, therefore to meet practical work
It is required, needs to be continuously adjusted negative high voltage size；Since the electric signal through photodetector conversion output is still weaker, lead to
It is often microampere order, and different characteristic spectral line is different to responsiveness, that is, signal strength of laser, it is therefore desirable to respectively to each feature
Spectral line signal carries out further Change of integral time and amplification is adjusted.To sum up, it designs and a kind of meets laser induced breakdown spectroscopy
Instrument signal analysis require control and acquisition system, for realize instrument analytic function, promoted instrument analysis performance and from
Dynamicization is horizontal most important.
Summary of the invention
In view of the above technical problems, the object of the present invention is to provide a kind of signal controls for laser induced breakdown spectrograph
System and acquisition system and method, with realization to the accurate control of laser synchronization time delayed signal, the number of photodetector negative high voltage
Change control and real-time monitoring and adjust, acquire, store, be packaged and be uploaded to PC machine to the integral amplification of characteristic spectral line signal,
Finally obtain the content and its distributed intelligence of sample to be tested characteristic element afterwards through computer analysis and processing.
To achieve the goals above, the present invention provides the following technical scheme that
The present invention provides a kind of signal control and acquisition system for laser induced breakdown spectrograph, which includes swashing
Photoelectric source control unit, signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit, negative high voltage
Acquisition control unit and communication interface converting unit；
The signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit and negative high voltage are adopted
Collection control unit is fixed by one piece of bridge crossing plate and realizes the interconnection of global semaphore；
PC machine and the data acquisition process unit pass through network interface respectively and connect with communication interface converting unit, the laser
Power control unit, signal integration delays time to control unit and negative high voltage acquisition control unit pass through serial ports respectively and communication interface turns
Change unit connection；
The Laser Power Devices control unit is controlled by PC machine and is exported synchronous triggering signal, starts laser light source；
It is defeated to signal integration amplifying unit after the signal integration delays time to control unit is triggered by the synchronous triggering signal
Multi-pass trace integral time delayed signal out；
The signal integration amplifying unit receives multi-pass trace integral time delayed signal and is controlled by it, to multichannel photodetection
Device output signal carries out integral amplification；
The data acquisition process unit is to integrating after amplified signal is acquired, stores, is packaged through communication interface
Converting unit is transmitted to PC machine；
The negative high voltage acquisition control unit is monitored and controls to the negative high voltage of multichannel photodetector.
The signal integration delays time to control unit includes signal shaping module, main controller module and serial communication module；
The signal shaping module is made of a piece of double precision monostable flipflop and its peripheral circuit, by peripheral electricity
The shaping to Laser Power Devices control unit output laser synchronization trigger signal is realized in the configuration on road；
The main controller module is controlled using FPGA, is delay starting point, essence with the synchronous triggering signal rising edge after shaping
Really control laser synchronization delay time, exports multi-pass trace integral time delayed signal, and the multi-pass trace integral time delayed signal is that multichannel is only
Vertical and continuously adjustable, control precision is nanosecond order；
The serial communication module is made of a piece of single supply electrical level transferring chip and its peripheral circuit, realizes the signal
Control and the bidirectional communication function between acquisition system and PC machine.
The signal integration amplifying unit includes integrating channel control module and operational amplifying module；
The integrating channel control module is made of the analog switch on 16 tunnel of multi-disc, by the signal integration delays time to control list
The multi-pass trace integral time delayed signal that member generates is controlled by winding displacement, is realized and is controlled the channel of operational amplifying module；
The operational amplifying module is made of multi-disc operational amplifier and its peripheral circuit, by using high-precision current potential
Meter is realized continuously adjustable to the amplification factor of multichannel photodetector output signal.
The data acquisition process unit is using FPGA as main control chip.
The negative high voltage acquisition control unit includes main controller module, serial communication module, a piece of multichannel DA chip and one
Piece multichannel A/D chip；
The main controller module uses ARM chip, is loaded into the target negative high voltage value on multichannel photodetector by PC
Machine setting, and the target negative high voltage value is sent to ARM chip through serial communication module, ARM chip is after processing analysis
It controls DA chip and exports corresponding negative high voltage value；Meanwhile A/D chip acquires the actual negative being loaded on multichannel photodetector
High-voltage value is simultaneously sent to ARM, is sent to PC machine by serial communication module by ARM chip, is achieved in and visits to multichannel photoelectricity
The real-time monitoring and digitlization for surveying device negative high voltage continuously adjust control, and adjustable range is -1500V~0V.
Serial ports transmission is converted to Ethernet transmission by the communication interface converting unit, so that serial ports has network transmission
Function, and independent communication between each communication interface and PC machine is kept, PC machine and multi-hardware equipment are finally realized by single network interface
Between interaction.
A kind of signal control and acquisition method using the system, this method comprises:
1) laser light source configuration parameter is transferred to Laser Power Devices control unit by serial ports by PC machine, and Laser Power Devices control is single
Member generates synchronous triggering signal, and the synchronous triggering signal is transferred to signal integration delays time to control list by coaxial cable
Member；
2) signal integration delays time to control unit exports multi-pass trace integral time delayed signal after by synchronous triggering signal triggering；
3) signal integration amplifying unit receives multi-pass trace integral time delayed signal and is controlled by it, and visits to the multichannel photoelectricity
The output signal for surveying device carries out integral amplification；
4) turn after data acquisition process unit is acquired to the amplified signal of integral, stores, is packaged through communication interface
It changes unit and is transmitted to PC machine；
5) negative high voltage acquisition control unit is monitored and controls to the negative high voltage of multichannel photodetector.
Serial ports transmission is uniformly converted to Ethernet transmission by communication interface converting unit, so that serial ports has network transmission function
Can, and the individual transmission of each communication interface is kept, the interaction between PC machine and multi-hardware equipment is finally realized by single network interface.
In the step 2), signal integration delays time to control unit is by signal shaping module, main controller module and serial communication
Module composition；For the synchronous triggering signal after signal shaping module shaping, triggering Master control chip FPGA generates multichannel product
Point time delayed signal, control precision are nanosecond order, PC machine pass through serial communication module to the multi-pass trace integral time delayed signal into
Row configuration and adjusting.
In the step 3), signal integration amplifying unit is made of integrating channel control module and operational amplifying module；It is more
Channel integral time delayed signal is connect with signal integration amplifying unit by winding displacement and controls integrating channel selection, operational amplifying module
Integral amplification is carried out to the output signal of multichannel photodetector, and amplified signal will be integrated and be transferred to by bridge crossing plate
Data acquisition process unit.
In the step 5), negative high voltage acquisition control unit is by main controller module, serial communication module, a piece of multichannel DA core
Piece, a piece of multi-channel A/D chip composition；Main controller module is made of ARM chip and its peripheral circuit, and PC machine is through serial communication module
Negative high voltage configuration parameter is issued to main controller module, configuration parameter is transferred to DA chip after the processing of ARM chip analysis, is passed through
Each channel negative high voltage of DA chip signal output control multichannel photodetector；Real-time acquisition is applied using A/D chip simultaneously
The negative high voltage value added, and collection value is transferred to main controller module, finally PC machine is transferred to through serial communication module.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is using FPGA (Field-Programmable Gate Array, field programmable gate array) as control
The master chip of laser synchronization delay time processed is realized to multichannel integral, is prolonged using the strong advantage of its control precision height and expansion
When the time high-precision regulation and control；Accurate, high speed BiFET (the bipolar field-effect using multi-disc
Transistor, bipolar-field effect transistor) four-way operational amplifier to photodetector output signal carry out integral put
Greatly, the continuously adjustable of amplification factor is realized by high-precision potentiometer；Data acquisition process unit is using FPGA as master control
Chip by force and fireballing advantage using its parallel processing capability is realized to being acquired, deposit to integrating amplified signal
It stores up, be packaged and be transferred to PC machine；Negative high voltage acquisition control collection multichannel high-resolution DA (the Digital to of photodetector
Analog, digital-to-analogue conversion) chip and AD (Analog to Digital, analog-to-digital conversion) chip in one, realize PC machine to multi-pass
The Digital Control and real-time monitoring of road negative high voltage；Using communication interface converting unit by multiple serial ports transmission be uniformly converted to
Too net transmission, so that serial ports has network transmission function, and keeps independent communication between each communication interface and PC machine, is conducive to
System function is integrated, while improving the stability and anti-interference ability of system data transmission.
The present invention is embodied in the actual utility of laser induced breakdown spectrograph: according to the negative height in each channel of PC machine monitoring
Pressure is realized to the Digital Control and real-time monitoring of multichannel photodetector negative high voltage, meets actual analysis demand；By right
Delays time to control, integral amplification, acquisition storage and the packing processing of spectral signal, finally obtain each element content and its distribution letter
Breath, realizes the automation control and timely collection to spectrometer multi channel signals, improves the automatization level of instrument
And analysis precision；Serial ports transmission is uniformly converted into Ethernet transmission by communication interface converting unit, is conducive to system function
It is integrated, while improving the stability and anti-interference ability of system data transmission.
Detailed description of the invention
Fig. 1 is a kind of system block diagram of signal control and acquisition system for laser induced breakdown spectrograph of the present invention.
Specific embodiment
Invention is further explained with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of signal control and acquisition system for laser induced breakdown spectrograph of the invention, including
Laser Power Devices control unit, signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit, negative height
Press acquisition control unit and communication interface converting unit.
The signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit and negative high voltage are adopted
Collection control unit is fixed by one piece of bridge crossing plate and realizes the interconnection of global semaphore, to reduce the number of lead wires of each unit interconnection
Amount.
PC machine and the data acquisition process unit pass through network interface respectively and connect with communication interface converting unit, the laser
Power control unit and negative high voltage acquisition control unit pass through serial ports respectively and connect with communication interface converting unit.
The Laser Power Devices control unit is controlled by PC machine and exports synchronous triggering signal.
It is defeated to multichannel photodetector after the signal integration delays time to control unit is triggered by the synchronous triggering signal
Multi-pass trace integral time delayed signal out.
The signal integration amplifying unit receives multi-pass trace integral time delayed signal and is controlled by it, to multichannel photodetection
Device output signal carries out integral amplification.
The data acquisition process unit is to integrating after amplified signal is acquired, stores, is packaged through communication interface
Converting unit is transmitted to PC machine.
The negative high voltage acquisition control unit is monitored and controls to the negative high voltage of multichannel photodetector.
Serial ports transmission is uniformly converted to Ethernet transmission by the communication interface converting unit, so that serial ports is passed with network
Transmission function, and the individual transmission of each communication interface is kept, finally realized between PC machine and multi-hardware equipment by single network interface
Interaction.
The signal integration delays time to control unit is made of signal shaping module, main controller module and serial communication module.
The signal shaping module is made of a piece of double precision monostable flipflop and its peripheral circuit, passes through the configuration to peripheral circuit
Realize the shaping to Laser Power Devices control unit output laser synchronization trigger signal.The main controller module is controlled using FPGA,
It is delay starting point with the synchronous triggering signal rising edge after shaping, it is accurate to control laser synchronization delay time, output multi-channel is independent,
Continuously adjustable integral, delay time signal control precision up to nanosecond order.The serial communication module is by a piece of single supply
Electrical level transferring chip and its peripheral circuit composition realize the signal control and the both-way communication function between acquisition system and PC machine
Energy.
The signal integration amplifying unit is made of integrating channel control module and operational amplifying module；Integrating channel control
Module is made of the analog switch on 16 tunnel of multi-disc, passes through winding displacement by the integral control signal that signal integration delays time to control unit generates
Control is realized and is controlled the channel of operational amplifying module；Operational amplifying module is by multi-disc operational amplifier and its peripheral circuit group
At by using high-precision potentiometer, realization is continuously adjustable to the amplification factor of multichannel photodetector output signal.
The data acquisition process unit uses FPGA as main control chip, the amplified signal of integral is acquired,
PC machine is transmitted to through communication interface converting unit after storage, packing.
The negative high voltage acquisition control unit is by main controller module, serial communication module, a piece of multichannel DA chip and a piece of
Multi-channel A/D chip composition；Main controller module uses ARM (Advanced RISC Machines, Advanced Reduced Instruction Set processor)
Chip is loaded into the target negative high voltage value that multi-pass is crossed on photodetector and is arranged by PC machine, and will be described through serial communication module
Target negative high voltage value is sent to ARM chip, and ARM chip control DA chip after processing analysis exports corresponding negative high voltage value；
Meanwhile A/D chip acquisition is loaded into actual negative high-voltage value on photodetector and is sent to ARM, is led to by ARM chip by serial ports
News module is sent to PC machine, is achieved in and continuously adjusts control to the real-time monitoring of multichannel photodetector negative high voltage and digitlization
System, adjustable range are -1500V~0V.
The course of work of the invention is as follows:
After system electrification, laser light source configuration parameter is transferred to Laser Power Devices control unit by serial ports by PC machine, is swashed
Photoelectric source control unit generates synchronous triggering signal, and this signal is transferred to signal integration delays time to control list by coaxial cable
Member.
Signal integration delays time to control unit is made of signal shaping module, main controller module and serial communication module；It is synchronous
For trigger signal after signal shaping module shaping, triggering Master control chip FPGA generates multi-pass trace integral time delayed signal, control essence
It spends up to nanosecond order, PC machine can configure the multi-pass trace integral time delayed signal by serial communication module, adjust；
Signal integration amplifying unit is made of integrating channel control module and operational amplifying module；Multi-pass trace integral delay letter
Number by winding displacement connect with signal integration amplifying unit and control integrating channel select, operational amplifying module to multichannel photoelectricity spy
The signal for surveying device output carries out integral amplification, and this amplified signal is transferred to data acquisition process unit by bridge crossing plate.
Data acquisition process unit amplified signal is acquired, is stored, is packaged after through communication interface converting unit
It is transferred to PC machine.
Negative high voltage acquisition control unit is by main controller module, serial communication module, a piece of multichannel DA chip, a piece of multi-channel A/D
Chip composition；Main controller module is made of ARM chip and its peripheral circuit, and PC machine, which configures negative high voltage through serial communication module, joins
Number is issued to main controller module, and configuration parameter is transferred to DA chip after the processing of ARM chip analysis, passes through DA chip signal output
Control each channel negative high voltage of photodetector；Negative high voltage value using A/D chip that real-time acquisition is applied simultaneously, and will adopt
Set value is transferred to main controller module, is finally transferred to PC machine through serial communication module.
The serial ports that communication interface converting unit uses signal integration delays time to control unit and negative high voltage acquisition control unit
Communication is uniformly converted to Ethernet interface communication, and the network interface of data acquisition process unit is forwarded to transmit data, finally by single net
Cause for gossip shows the interaction between PC machine and multi-hardware equipment.
The above is specific embodiments of the present invention, but cannot be it is understood that for present invention is limited only to this, for being familiar with
For those skilled in the art, change made and deformation are belonged to without departing from the spirit and substance of the case in the present invention
The range of the claims in the present invention protection.
Claims (11)
1. a kind of signal control and acquisition system for laser induced breakdown spectrograph, it is characterised in that: the system includes swashing
Photoelectric source control unit, signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit, negative high voltage
Acquisition control unit and communication interface converting unit；
The signal integration delays time to control unit, signal integration amplifying unit, data acquisition process unit and negative high voltage acquisition control
Unit processed is fixed by one piece of bridge crossing plate and realizes the interconnection of global semaphore；
PC machine and the data acquisition process unit pass through network interface respectively and connect with communication interface converting unit, the Laser Power Devices
Control unit, signal integration delays time to control unit and negative high voltage acquisition control unit pass through serial ports respectively and communication interface conversion is single
Member connection；
The Laser Power Devices control unit is controlled by PC machine and is exported synchronous triggering signal, starts laser light source；
After the signal integration delays time to control unit is triggered by the synchronous triggering signal, exported to signal integration amplifying unit more
Channel integrates time delayed signal；
The signal integration amplifying unit receives multi-pass trace integral time delayed signal and is controlled by it, defeated to multichannel photodetector
Signal carries out integral amplification out；
The data acquisition process unit is converted after being acquired to the amplified signal of integral, store, be packaged through communication interface
Unit is transmitted to PC machine；
The negative high voltage acquisition control unit is monitored and controls to the negative high voltage of multichannel photodetector.
2. the signal control and acquisition system, feature according to claim 1 for laser induced breakdown spectrograph exists
In:
The signal integration delays time to control unit includes signal shaping module, main controller module and serial communication module；
The signal shaping module is made of a piece of double precision monostable flipflop and its peripheral circuit, by peripheral circuit
The shaping to Laser Power Devices control unit output laser synchronization trigger signal is realized in configuration；
The main controller module is controlled using FPGA, is delay starting point with the synchronous triggering signal rising edge after shaping, accurate to control
Laser synchronization delay time processed, exports multi-pass trace integral time delayed signal, the multi-pass trace integral time delayed signal be multichannel it is independent and
Continuously adjustable, control precision is nanosecond order；
The serial communication module is made of a piece of single supply electrical level transferring chip and its peripheral circuit, realizes the signal control
Bidirectional communication function between acquisition system and PC machine.
3. the signal control and acquisition system, feature according to claim 1 for laser induced breakdown spectrograph exists
In:
The signal integration amplifying unit includes integrating channel control module and operational amplifying module；
The integrating channel control module is made of the analog switch on 16 tunnel of multi-disc, is produced by the signal integration delays time to control unit
Raw multi-pass trace integral time delayed signal is controlled by winding displacement, is realized and is controlled the channel of operational amplifying module；
The operational amplifying module is made of multi-disc operational amplifier and its peripheral circuit, by using high-precision potentiometer,
It realizes continuously adjustable to the amplification factor of multichannel photodetector output signal.
4. the signal control and acquisition system, feature according to claim 1 for laser induced breakdown spectrograph exists
In:
The data acquisition process unit is using FPGA as main control chip.
5. the signal control and acquisition system, feature according to claim 1 for laser induced breakdown spectrograph exists
In:
The negative high voltage acquisition control unit includes main controller module, serial communication module, a piece of multichannel DA chip and a piece of more
Road A/D chip；
The main controller module uses ARM chip, and the target negative high voltage value being loaded on multichannel photodetector is set by PC machine
It sets, and the target negative high voltage value is sent to ARM chip through serial communication module, ARM chip controls after processing analysis
DA chip exports corresponding negative high voltage value；Meanwhile A/D chip acquires the practical negative high voltage being loaded on multichannel photodetector
It is worth and is sent to ARM, PC machine is sent to by serial communication module by ARM chip, is achieved in multichannel photodetector
The real-time monitoring of negative high voltage and digitlization continuously adjust control, and adjustable range is -1500V~0V.
6. the signal control and acquisition system, feature according to claim 1 for laser induced breakdown spectrograph exists
In: serial ports transmission is converted to Ethernet and transmitted by the communication interface converting unit, so that serial ports has network transmission function,
And independent communication between each communication interface and PC machine is kept, finally realized between PC machine and multi-hardware equipment by single network interface
Interaction.
7. a kind of utilize the signal control of system described in claim 1 and acquisition method, it is characterised in that: this method comprises:
1) laser light source configuration parameter is transferred to Laser Power Devices control unit by serial ports by PC machine, and Laser Power Devices control unit produces
Raw synchronous triggering signal, and the synchronous triggering signal is transferred to signal integration delays time to control unit by coaxial cable；
2) signal integration delays time to control unit exports multi-pass trace integral time delayed signal after by synchronous triggering signal triggering；
3) signal integration amplifying unit receives multi-pass trace integral time delayed signal and is controlled by it, to the multichannel photodetector
Output signal carry out integral amplification；
4) data acquisition process unit is single through communication interface conversion after amplified signal is acquired, stores, is packaged to integrating
Member is transmitted to PC machine；
5) negative high voltage acquisition control unit is monitored and controls to the negative high voltage of multichannel photodetector.
8. signal according to claim 7 control and acquisition method, it is characterised in that: communication interface converting unit is by serial ports
Transmission is uniformly converted to Ethernet transmission, so that serial ports has network transmission function, and the independent of each communication interface is kept to pass
It is defeated, the interaction between PC machine and multi-hardware equipment is finally realized by single network interface.
9. signal control according to claim 7 and acquisition method, it is characterised in that: in the step 2), signal integration
Delays time to control unit is made of signal shaping module, main controller module and serial communication module；The synchronous triggering signal is through believing
After number Shaping Module shaping, triggering Master control chip FPGA generates multi-pass trace integral time delayed signal, and control precision is nanosecond order,
PC machine is configured and is adjusted to the multi-pass trace integral time delayed signal by serial communication module.
10. signal control according to claim 7 and acquisition method, it is characterised in that: in the step 3), signal integration
Amplifying unit is made of integrating channel control module and operational amplifying module；Multi-pass trace integral time delayed signal passes through winding displacement and signal
Integral amplifying unit connect and controls integrating channel and selects, operational amplifying module to the output signal of multichannel photodetector into
Row integral amplification, and amplified signal will be integrated, data acquisition process unit is transferred to by bridge crossing plate.
11. signal control according to claim 7 and acquisition method, it is characterised in that: in the step 5), negative high voltage is adopted
Collection control unit is made of main controller module, serial communication module, a piece of multichannel DA chip, a piece of multi-channel A/D chip；Main controller
Module is made of ARM chip and its peripheral circuit, and negative high voltage configuration parameter is issued to main controller through serial communication module by PC machine
Module, is transferred to DA chip for configuration parameter after the processing of ARM chip analysis, controls multichannel photoelectricity by DA chip signal output
Each channel negative high voltage of detector；Negative high voltage value using A/D chip that real-time acquisition is applied simultaneously, and collection value is transmitted
To main controller module, PC machine finally is transferred to through serial communication module.
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| CN111740753A (en) * | 2020-05-15 | 2020-10-02 | 苏州霞军通讯有限公司 | Network communication signal acquisition system |
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