How to select RFID UHF reader?--SLON RFID
Issue Time:2014-05-16


RFID hardware system consists of two partselectronic tags and readers . RFID reader antenna for wireless communicationvia electronic tags , can read or write to the tag ID and memory data. Atypical reader includes a radio frequency section , the control processing unitsection , I / O interface portion and four power section .




First, the reader works

RFID reader is the basic unit of the system, the basic components of the RFID system consists of two parts tags andreaders , RFID applications , including tags, readers and RFID applicationplatform three parts. The main principles of composition reader module includesbaseband and RF module two parts. Wherein the baseband module includes abaseband signal processing section , application program interface , controland protocol processing, and command data can be divided into transmitter RFmodule and receive channels of two parts , including a radio frequency signalmodulation and demodulation process , send and receive data and commandinterfaces , transmit and receive channels , transceiver separation ( antennaconnection ) and so on.

Second, the reader classification

  Classified by means of communication , RFIDreader can be divided into priority and label reader priority categories.Reader priority (RTF) is the first reader to send commands to the radiofrequency energy and labels , the label is activated only when the reader andthe receipt of a complete command, fishes reader sends a command to respond ,return the corresponding data information . Tag priority (TTF) refers to thepassive tag systems , the reader sends only amplitude of the RF energy withoutinformation. After the tag is activated , backscatter tag data . 

When classified according to the transportdirection , RFID read full duplex mode means that RFID systems work , allowingtags and readers at the same time two-way transmission of information . RFIDsystem is the half-duplex mode when working at the same time allowing thereader only transfer commands or information into the label , tag or returninformation to the reader . By Application pattern classification , can bedivided into fixed reader , portable reader, integrated and modular reader reader. Fixed reader antenna means , separate reader and the host computer , readerand antenna can be fixed installed separately , usually installed in the hostcomputer or resettlement elsewhere , the reader may have multiple antennas andmultiple interfaces kind of I / O interfaces ; portable reader is the reader,antenna and integrated with the host computer , the reader has only one antennainterface , reader and host computer interface design with the manufacturersconcerned ; integrated reading writer refers to the antenna and readerintegrated in a single chassis, fixed installation , the host computer isusually installed or placed in other places, one reader and the host computercan have multiple interfaces ; modular reader refers to the general reader asan integrated system equipment unit , the interface and applications on thereader and the host computer .

Third, the choice of the reader

In addition to the purchase of equipment tolearn to read and write RFID system deployment requirements for the reader ,but also to understand the characteristics of the reader . To the reader todetermine which of the models according to their position in the supply chain ,as well as the purpose and location of the installation of the RFID reader .Choosing the right reader for the successful implementation of other work has akey role. If the reader can buy a reasonable strategic choice to achieve a multipliereffect.

According to the amount of choicemultifunction capabilities reader can read the tag information of differentfrequencies , but also has to filter data and execution functions , but theprice is relatively high, but fewer features reader cheap. In specificoperations , sometimes requiring multiple reader reads the tag information ofthe same model , such as reading can use features than simple reader when thetag information on the transfer unit . However, if the retailer's products fromdifferent suppliers, you need to use multi-functional reader to get a differentlabel cargo information .

With the increase of data processing, thenumber of end-user functions reader comprising also increased , the reader cannot only filters some of the data and may also store data . For example , whenlabeled by the pallet reader, because the field crowding , the reader must readmore than once to allow the tag information , the reader inputs to the tag IDnumber of the inventory management system number only once. Also some readerwith functionality by running the application software to perform filteringcommands, for example , some retailers in the receiving area equipped withsound and light alarms reader, if the reader has just read the labels on the goodspurchased information, but not in the sale of these goods on the shelves , thereader will be the police, the clerk heard the alarm will immediately sell thegoods onto the shelves .

Select the frequency band in accordancewith such ultra-high frequency (UHF) tags operating frequency is 860? 960MHz,due to its reading distance is longer, so widely used in the supply chain .However, due to the high frequency (HF) tags operating frequency 13.56MH z, ispreferably within a short distance performance . Therefore, when consideringwhether to buy the reader also need to buy dual-frequency reader . If you onlywant to read the information on the label also reads information HF UHF tags ,then you need to consider is to buy both HF and UHF bands reader, or buy onlyone dual-frequency reader . Although many reader manufacturers produce only asingle band reader, but we can easily buy a dual-frequency reader .

Since most of the supply chain softwareapplications work in UHF frequencies , so buy with UHF reader to reader -based,if necessary, buy HF reader . This is because buying a single frequency readercheaper than hybrid frequency reader .

In addition, the global RFID operatingfrequencies are not identical , the operating frequency UHF reader in Europe is865-868MHz, in North America is 902-928MHz, in Japan is 950-956MHZ. When youdeploy a global RFID project plan to ensure that the selected reader can workin different regions of the world . Choose a fixed reader applicationsinstalled in accordance with the general circulation of goods larger premises ,many fixed readers are housed in a metal box that can be installed on the wall,these readers are either internal antenna either have no internal but theantenna jack for an external antenna access . To prevent damage, fixed antennasare generally made ​​of plastic or metal package together. Pollution in a boxreader and antenna from forklift damage and dust , reader manufacturers alsoproduced a specialized truck used in the reader . There is no doubt that a widevariety of RFID reader expanded range of applications .

This one needs to consider what type ofantenna is installed on a fixed number of readers and antennas installed oneither a fixed reader has an internal antenna , either with an external antennafor installation of multiple antenna interface . Different forms of readerantennas can be common . Advantage of having an internal fixed reader antennais easy to install , the transmission of signals from the interrogator to theantenna attenuation less. But using the internal antenna of the reader in thesame number to be used than in the case of the number of external antennasreader . Furthermore, the fixed reader connected to the input-output device ,the role of these devices is to control the reader to accept or control . Forexample, when the tag reader into the work area to open and control theelectronic eye on the reader to enter the working state .

One of the benefits RFID brings to peopleis to reduce the number of personnel engaged in the work of the label scanning, in general, users use more portable reader , portable reader because cheaper. For example , Wal-Mart, the main use of portable reader looking cartons inthe warehouse. Portable reader mainly in two forms , one is both barcodescanning RFID reader , which can either scan the bar code reader can also readelectronic tags . Another is installed on the PC card RFID reader , PC cardwireless card slot embedded in a laptop or handheld computer .

Many newly installed fixed reader viaEthernet or Wi-Fi and LAN or WAN connection phase . Wireless connection reducesinstallation difficulty but also saves installation costs, because it is not alot of cable laying . Portable reader via a wired or wirelessly download datato a PC.

Fourth, the well-known reader supplymanufacturers

Shenzhen Invengo Information TechnologyCo., Ltd. produces XCR F-800 Series reader is the latest member of YuanwangguRFID product family supports EPC C1 Gen2 standards to meet the needs of thesupply chain RFID applications. The product line for international retail andsupplier of application requirements and design, with XCTF-8000 series ofelectronic tags , enabling asset tracking and information management,enterprise-class . XCR F-800 series reader products, including fixed readersand reader modules to meet different application requirements.




2 , ZTE

ZTE Corporation produced ZXRIS6600 and 6700series reader is exceptionally indoor and outdoor application scenarios ,support EPC C1 G2 and ISO18000-6B and other standards, mainly used in the supplychain , manufacturing , logistics, asset management, personnel , librarymanagement and other applications. This series of readers are up to IP55protection class level and above, is one of the most unique products in thereader products , high level applications , performance is also the industryleader .



3, ALIEN Alien

ALIEN company ALR9800 and 9900 Series isthe industry's leading reader can , like its performance exceeded intermec,symbol and some other products , but because of its different productpositioning , and its price is extraordinarily high , generally used forlaboratory applications practical applications cost too much. The biggestdrawback lies in its protection level in IP53, good waterproof performance,outdoor applications still make additional protective measures.

4, intermec Intermec

Intermec IF5 America 's latest EPC Gen2 andISO -oriented intelligent RFID reader . IF5 Fixed RFID reader based on theLinux platform. In such a data terminal , eliminating the need for anindustrial PC , filtering and processing the data directly . In the endenterprise application server does not need to manage RFID reader . IF5 RFIDsupport three frequency bands , and offers four flexible antenna interface canbe composed of a scanning tunneling . Structural strength IF5FID withindustrial-grade reader , can work in a variety of harsh industrialenvironments.


5 , InfoQuick Technology


Shenzhen Jie Tong Technology Co., Ltd. isengaged in the research and development of long-range RFID UHF passive RFIDreader product development, production and sales of professional technologycompanies. Shenzhen Jie Tong Technology Co., Ltd. brings together China RFID,UHF reader industry's top talent , to create a radio frequency identificationindustry engineering and technology research and development centers. Anti-collisionin RFID electronic identification technology, dominate , ahead of other peertechnology. Class R & D team , based on Impinj R2000 chip , developed amodule R2000 , R2000 series reader, channel reader .


R2000 program features are: ability to readmultiple cards 0-250 labels , card rate, high sensitivity , RSSI detectiondistance.


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