CN208673326U - A kind of data acquisition expander - Google Patents

Abstract

The utility model provides a kind of data acquisition expander, including controller, On-off signal output, converter, D/A converter, RS232 level translator, RS485 transceiver and USB2.0 interface, the data acquisition and control to analog quantity and digital quantity during produced on-site may be implemented, while the communication that other on-scene communication interfaces realize the field device of equipment informatization terminal and other interfaces can be designed on both expansion modules.

Description

A kind of data acquisition expander

Technical field

The utility model relates to data collecting fields more particularly to a kind of data to acquire expander.

Background technique

Data acquisition technology is a basic practicability technology, it is widely used in image procossing, voice signal point The various fields such as analysis and transient signal analysis.The general or special purpose data collection system of different performance index at present, various It is seen everywhere in field.But due to the influence of many factors such as cost or technological development, its speed of general data collection system Degree and port number are not able to satisfy the test request of some special dimensions, therefore usually need according to specific demand come design specialized Data collection system.

Information-based terminal in networked mfg system be in various environment implement net instrument key device it One, and data collection system is to realize the information integration of the entire production process of manufacturing enterprise, Comprehensive Automation and network Change the basis that mechanical floor remotely monitors in manufacture.In practical applications, data acquisition usually links together with Industry Control, shape At the data acquisition monitoring system of complete set.Data acquisition and control since various industry spot conditions are different, to scene The requirement of function is also not quite similar, and the architecture of various information-based terminal uses and design scheme have very big difference It is different, thus how on the basis of various information-based terminals the acquisition of flexible expansion data meets scene needs with control module and sets Count novel data collector.

The speed ratio of the data acquisition and processing (DAP) of PC+ data collecting card mode is very fast；But the interface resource of PC is limited, and And need to carry out reasonable disposition to the hardware resource of interface card, extension difficulty is larger.Although the plug and play interface released later Standard (PCI and ISAPnP), is automatically performed the resource distribution to interface card by basic input output system and operating system, so that The use of Function Extension interface card becomes relatively easy convenience, but still there are the following problems；

1) first, the configuration of card must be shut down, and needed to open PC machine case and mounted and dismounted, using still having Very big inconvenient.

2) installation, debugging of interface card device driver or even normal course of operation require various technical supports, special It is not after interface card is inserted into PC as a kind of hardware device, the various hardware resources of Yao Zhanyong PC, installation configuration process is still It requires manual intervention.When expansion card is more, usually will appear because one or more plug-in card can not reasonable disposition due to cannot be normal The situation of work even results in whole system collapse when serious.

3) interface card quality height, compatibility and driver reliability directly affect computer service life and The stability of system.

4) PC small-sized for laptop etc. is difficult to be extended card interface.

5) interface card will receive the radio frequency interference inside PC, be greatly affected its performance.

Intrinsic thinking of the more than ten years people about data collection system several modes is changed in the appearance of usb bus, Usb bus had not only inherited the scalability of RS485 bus, but also added somewhat to overcome the adaptability of bandwidth simultaneously Some inherent defects of pci card: as being connected to outside the cabinet of industrial control computer, not by slot and other limits such as interrupt System.Therefore usb bus becomes the optimal selection of design scalability data collection system at present.

The utility model proposes one kind based on information-based terminal, using the acquisition of usb bus growth data and control module Distributed data acquisition and control overall plan.

Utility model content

The purpose of the utility model is to provide a kind of data to acquire expander, has arc-shaped runner simultaneously, and in circle The dispersion of arced flow path center is placed with fin, optimizes so as to the heat dissipation effect to data acquisition expander.

The embodiments of the present invention provide a kind of plane data acquisition dilatation terminal, comprising: controller, switching value are defeated Enter output, converter, D/A converter, RS232 level translator, RS485 transceiver and USB2.0 interface, the controller It is exported with the On-off signal, converter, D/A converter, RS232 level translator, RS485 transceiver and USB2.0 Interface is electrically connected.

In one embodiment, the controller is CY7C68013；

In one embodiment, it is described converter be American TI Company production 12-bit parallel output A/D chip ADS7852；

In one embodiment, the D/A converter is that the 12-bit of American TI Company production inputs D/A chip parallel DAC7802；

In one embodiment, the design of switching value is done in On-off signal output using parallel port PC and PE, and described is opened The photoelectrical coupler that has been all made of when outputting and inputting of pass amount is isolated；

The advantages of the utility model:

1) needs of high-speed data acquisition then be can satisfy by usb bus, while the characteristics of plug and play can be flexible Various functional modules are replaced, different site requirements is adapted to.It meets this project and is not changing equipment informatization terminal hardware Under the premise of growth data acquisition and the needs of control function.In addition, due to current web technology popularization and USB device it is extensive Using the ethernet controller and USB controller of standard configuration were embedded at most 32 in PC machine and industrial personal computer originally It is integrated in formula processor, the embedded system for even itself not having both modules can also easily pass through part Ethernet controller and USB controller outside bus extension piece.Therefore, current information-based terminal is either based on industrial personal computer also It is to be substantially all based on 32 embedded systems and have 100M Ethernet interface and usb host port, to be expanded using Industrial Ethernet Exhibition and the acquisition of usb bus growth data and control module two schemes provide hardware foundation, so the utility model is being studied Industrial Ethernet and usb bus are after the application status of industry spot, in conjunction with the current informationization terminal the characteristics of, determine to use Industrial Ethernet and usb bus extend the data acquisition and control module of equipment informatization terminal.

2) it may be implemented by Industrial Ethernet on-site supervision module and USB on-site supervision module, equipment informatization terminal To the data acquisition and control of analog quantity and digital quantity during produced on-site, while can be on both expansion modules Design the field device that other on-scene communication interfaces (RS232, RS485, CAN etc.) realizes equipment informatization terminal and other interfaces Communication, field device is passed through into information-based terminal and accesses field control layer Industrial Ethernet.Information-based terminal will be collected Production process data is analyzed, is handled, saved and is uploaded, and shares field data on the network, makes management level transparent Recognize entire production status.

Detailed description of the invention

Fig. 1 is the hardware block diagram that the utility model embodiment data acquire expander；

Fig. 2 is CY7C68013 structure chart in the utility model embodiment；

Fig. 3 is ADS7852 functional block diagram in the utility model embodiment；

Fig. 4 is the interface circuit figure of ADS7852 and CY7C68013 in the utility model embodiment；

Fig. 5 is the interface diagram of DAC7802 and CY7C68013 in the utility model embodiment；

Fig. 6 is On-off signal output circuit figure in the utility model embodiment；

Fig. 7 is the utility model embodiment outside drawing.

Specific embodiment

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.

General plotting according to the present utility model provides a kind of data acquisition expander, as shown in Figure 1, entire usb data The hardware block diagram of acquisition control expansion module, master controller is using Cypress Semiconductor company CY7C68013.The module realizes the A/D conversion of 12,8 tunnel precision using the GPIF Interface Controller ADS7852 of CY7C68013 Function, equally being connected by GPIF with DAC7802 realizes the D/A function of 12,2 tunnel precision.In addition it directlys adopt Two the parallel ports PC and PE of CY7C68013 realize the input of 8 way switch amounts and the output of 8 way switch amounts respectively, switching value It outputs and inputs all by connecting again with outside after Phototube Coupling.It, will in order to realize the communication with live serial equipment The UART0 of CY7C68013 is designed to RS232 serial ports by RS232 level translator, and UART1 is set by the transceiver of RS485 Count into RS485 serial ports.

As shown in Fig. 2, CY7C68013 is the EZ-USBFX2 series of products of Cypress Semiconductor company, it is The microprocessor of first item integration USB 2.0 in the world, it is integrated with USB2.0 transceiver, SIE (Serial Interface Engine), enhancing 8051 microcontrollers and programmable peripheral interface, shown in internal structure Fig. 2.This originality structure of CY7C68013 can Data transmission rate is set to reach 56Mbytes/s, the i.e. maximum bandwidth that USB2.0 allows.In CY7C68013, intelligent SIE can be hard The many USB1.1 and USB2.0 agreements of part processing, to reduce the development time and ensure the compatibility of USB.GPIF (General Programmable Interface) and master/slave endpoint FIFO (8 or 16 bit data bus) be ATA, PCMCIA and DSP etc. provides simple and seamless connection interface.CY7C68013 is closely integrated circuit as one, is USB peripheral Exploitation provides a total solution.Four key characteristics of EZ-USBFX2 series of products are:

1. providing the soft solution based on RAM, it can be convenient user and configure and upgrade.

2. not limited by number of endpoint, buffer size and transmission rate.

3. completing most of USB affairs in USB kernel, simplifies and program and the USB design cycle can be accelerated.

4. providing general programmable interface (GPIF), convenient for being connected with other bus interface.

The analog-digital converter (A/D) that the utility model uses is the 12-bit parallel output A/D core of American TI Company production Piece ADS7852, schematic diagram have 8 channels, power loss as shown in figure 3, the maximum sample rate of ADS7852 is 500kHz There was only 13mW under the conditions of 500kHz sample rate, power consumption is very low, and ADS7852 also has one and half sleep patterns and one complete Sleep pattern, can be when it be without data conversion lower power consumption to 2mW；This characteristic of ADS7852 fully meets water The requirement of lower repeater system low-power consumption.ADS7852 can be with external reference voltage, reference of the input voltage range at 0V to two times Between voltage.

ADS7852 is by three pin, that is, A2, Al, A0 come selector channel, and A2, A1, A0 are met CY7C68013 by us here PA4, PA3, PA2 be used to do channel selecting.Vref pin is additional reference source foot, we pass through one on the pin herein The capacity earth of a 0.1uF and 2.2uF, makes its input voltage range between 0V-5V.AIN0-AIN7 is 8 simulation letters Number input pin, DB0-DB11 be 12-bit conversion after data output port, they are coupled with to the number of CY7C68013 It is connected according to line FD0-FD11, CY7C68013 is to read data from ADS7852 according to 16-bit, and high 4bits therein is invalid Position, it should it is zeroed out, no person will lead to error in data.

ADS7852 carries out a data conversion within 16 clock cycle.In two clock weeks of the head that data conversion starts In phase, WR and CS must become low level and carry out log-on data conversion, and WR and CS is got higher in latter two period of data conversion, Show that data conversion has been completed.WR and CS can be any level at other times.By WR and CS and clock cycle Be 16 times of the ADS7852 clock cycle clock CLK be connected, which is produced after two divided-frequency by the CLKOUT of CY7C68013 It is raw, it can satisfy the requirement in data conversion process to WR and CS in this way.

Such as the interface circuit figure of Fig. 4, ADS7852 and CY7C68013, BUSY is low in data conversion process, is told CY7C68013 or host current data are invalid.After ADS7852 completes a data conversion, BUSY is got higher, notice CY7C68013 or host current data are effective, can fetch, and at this moment CY7C68013 or host can be from the outputs of ADS7852 Read data in end.Interrupt pin INT0 after BUSY reverse phase with CY7C68013 is connected, using interrupted application program from A/D Read data.RD is connected by we with the CTL1 of CY7C68013, as the enable signal read to A/D.ADS7852 with The interface mode of CY7C68013 is as shown in Figure 4:

Such as the interface schema of Fig. 5, DAC7802 and CY7C68013, the digital analog converter (D/A) that the utility model uses is beauty The 12-bit of TI company, state production inputs D/A chip DAC7802 parallel, it has, and there are two the channels DAC.DAC7802 has very low Power consumption, for typical power consumption in 1mW or so, maximum power dissipation is l0mW or so, information-based terminal that will be very low for system power dissipation For be highly beneficial.The output voltage range of DAC7802 is related with reference voltage, its reference voltage pin is VRFFA, The range of output voltage is precisely referred in-VRFFA to+VRFFA or so, the utility model using the+5V of 78L05 voltage-stablizer composition Power supply, so the actual output voltage range of DAC7802 is between -5V to+5V.

DAC7802 has 12 input pin DB11-DB0, their direct and CY7C68013 data line FD0-FD11 phases Even.DAC7802 use+5V power supply power supply, power pin are VDD as ADS7852, the power supply of this+5V is not by number What circuit power provided, but the analog power after magnetic bead capacitor filtering.

WR and CSA is the control signal of DAC7802, they are all directly on the GPIF of CY7C68013, then lead to Cross the interface logic being programmed to GPIF to realize it with CY7C68013.

The write timing and the timing of writing of CY7C68013 of DAC7802 is essentially identical, therefore we are WR, CSA and CSB It is connected respectively with CTL3, CTL4 and CTL5 of CY7C68013, wherein CSA is the chip selection signal of the A channel of DAC7802, and CSB is The chip selection signal of the channel B of DAC7802, WR are the write enable signals of DAC7802.

Bottom has many on-off models, therefore usb expansion data just have and devise the defeated of 8 way switch amounts with control module Out with the input of 8 way switch amounts.In view of reduce cost factor, maximum performance performance CY7C68013 itself function, we Not by the way of CPLD come expansion switch amount, but use two the parallel port PC and PE not used in the present system Do the design of switching value.In view of bottom has strong interference, outputting and inputting for switching value has been all made of photoelectricity coupling in the design Clutch is isolated.Physical circuit figure is illustrated in fig. 6 shown below.

Referring to Fig. 7, data acquisition expander fixed data by the way of storage box designed by the utility model is acquired Expander.

The foregoing is merely the utility model preferred embodiment, structure is not limited to the above-mentioned shape enumerated, Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in this reality Within novel protection scope.

Claims (5)

1. a kind of data acquire expander, it is characterised in that: including, controller, On-off signal output, converter, DA turns Parallel operation, RS232 level translator, RS485 transceiver and USB2.0 interface, the controller and the On-off signal are defeated Out, converter, D/A converter, RS232 level translator, RS485 transceiver and USB2.0 interface are electrically connected.

2. a kind of data as described in claim 1 acquire expander, it is characterised in that: the controller is CY7C68013.

3. a kind of data as described in claim 1 acquire expander, it is characterised in that: described in converter is U.S. TI public affairs Take charge of the 12-bit parallel output A/D chip ADS7852 of production.

4. a kind of data as described in claim 1 acquire expander, it is characterised in that: the D/A converter is American TI Company The 12-bit of production inputs D/A chip DAC7802 parallel.

5. a kind of data as described in claim 1 acquire expander, it is characterised in that: the On-off signal output is using simultaneously Mouth PC and PE does the design of switching value, and the photoelectrical coupler that has been all made of when outputting and inputting of the switching value is isolated.