CN101567826A - WLAN adapter for logistics RFID wireless local area network system - Google Patents
WLAN adapter for logistics RFID wireless local area network system Download PDFInfo
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Abstract
The invention provides a WLAN adapter for a logistics RFID wireless local network system in order to ensure the data seamless adaption between data from an RFID reader and a computer in a wireless local area network in a logistics RFID wireless local network. The WLAN adapter uses an RS485 standard industrial bus, is connected with the RFID reader by a twisted pair cable for the communication with the RFID reader, works in a semiduplex mode, and has two serial ports COM1 and COM2 for connection with other intelligent equipment. Moreover, the WLAN adaptor has four paths of analog input, eight paths of digital input and four paths of digital output.
Description
Technical field
[001] the present invention relates to a kind of WLAN adapter that is used for transfer of data, more specifically, relate to a kind of WLAN adapter that is used for logistics RFID wireless local area network system.
Background technology
[002] recent many logistics distribution merchants to point out to use the RFID logistlcs technology be one " a matter of great account feelings ".Logistics be meant article from the supply place to the physical flow process that receives ground, according to actual needs, basic functions such as transportation, storage, loading and unloading, carrying, packing, circulation, processing, dispensing, information processing are implemented to organically combine.Because need satisfy some clients' special dispensing requirement, the advantage of RFID technology emerges thus.Many suppliers of countries in the world comprise DHL at present, UPS, and TNT furtheing investigate the also marrow of profound lesson RFID technology, and best research is for the most excellent application; By effective this technology of utilization in fieldwork operation, the great majority among them have believed firmly that RFID can cause a speed-raising tide in the whole world, it increase work efficiency and impayable competitiveness aspect should not be underestimated.Logistics distribution merchant particularly, they have been in the position of taking the lead in race in this match of RFID logistical applications.
[003] suppliers think that adopting RFID is that a company grows up necessary.It is one " a matter of great account feelings " that recent many logistics distribution merchants point out to use the RFID technology.Because need satisfy some clients' special dispensing requirement, the advantage of RFID emerges thus, some logistics companies have adopted RFID logistics distribution technology at first, can make them occupy advantage being in the competition of company of the state of looking around with other so in advance.In addition, the major company as DHL, the RFID technology of having introduced the development moulding makes equally and oneself has been in leadership.
[004] RFID is forward-looking, strategic, can bring revolutionary variation to economic and social life, and this has also become international common recognition.Its characteristics one are to contain much information, the 2nd, can in moving, discern, and as long as information-based condition satisfies, can commence business at any time and place.This just means that RFID can support the pattern of Mobile business.
[005] general RFID also comprises the reader of supporting with it RFID except comprising the RFID chip.The RFID reader is made of modules such as control system, communication interface, microstrip antenna and power supplys.(Handheld Reader HR) is a kind of in the middle of the reader to handheld reader, and it is suitable for, and the mobile subscriber is hand-held to be used, and its operation principle and other reader are just the same.It can also have LCD, keyboard and bar code scanning module except the module that general reader had.The communication interface of HR is optional 802.11, RS232 etc., therefore can with access point (Access Point, AP) communication of WLAN.The supply power voltage of HR adopts the chargeable battery power supply; Operating system can adopt WinCE or other operating system; Storage 32M flash memory, 32M internal memory; Antenna is built-in aerial or probe detector.
[006] on the other hand, from the situation of present application, wireless local area network technology is a kind of extension to common local area network (LAN).It has now all obtained successful Application in many industries for the means of real-time connection are provided between the user of mobile office and the network.The combination of wireless technology, mobile computing technology, bar code data acquisition technology simultaneously, make that a kind of new product---wireless hand-held bar code terminal (RF) is arisen at the historic moment, and be widely used in each links such as storage in-out-storehouse management, cargo survey, transportation and industrial production line management of logistics field.
[007] WLAN (Wireless Local Area Networks, WLAN) be data transmission system quite easily, it utilizes radio frequency (Radio Frequency, RF) technology, replace the LAN that old-fashioned copper twisted pairs of getting in the way (Coaxial) is constituted, make WLAN can utilize simple access architecture to allow the user see through it, reach the ideal state of " information is changed with oneself, facility walk all over the world ".
[008] wireless local area network technology is a kind of data exchange system of flexibility, be to common local area network technology a kind of extension, replenish.It is by adopting wireless communication technique, need not between computer line and just can send and accept data, realizes the shared of data, resource.The network management personnel does not need line again, configuration network.Wireless network has been compared following characteristics with common local area network (LAN):
[009] 1, flexible mobility: wireless network can be the user real-time, two mobility network resource-sharing is provided.This is that common local area network (LAN) is beyond one's reach.
[010] 2, installation is simple, quick.
[011] 3, operating cost is cheap: although initial investment than common local area network (LAN) height, installation cost, operating cost and useful life from integral body, has all obtained huge improvement.Especially under the roving operational environment of user, operating cost is very low.
[012] 4, extensibility is strong: WLAN (wireless local area network) can be mixed with various network topologies and satisfy multiple application and needs are installed.From point-to-point mininet, to the network system that has thousands of nodes, and the catenet of realizing roaming function in a certain scope, all do not need to change any hardware facility.
Summary of the invention
[013],, the invention provides a kind of WLAN adapter that is used for logistics RFID wireless local area network system from the data of RFID reader and the data seamless adaptation between the WLAN computer in order to ensure in the logistics RFID wireless local area network.This WLAN adapter uses RS485 standard industry bus, be connected by twisted-pair feeder with the communication between the RFID reader, working method is half-duplex, have COM1, COM2 dual serial mouth, be used for linking to each other, and this WLAN adapter has the input of 4 tunnel analog quantitys with other smart machine, the input of 8 road digital quantities, the output of 4 road digital quantities.
[014] power supply of described WLAN adapter adopts the DC-DC integrated module.
[015] COM1 of described WLAN adapter, COM2 have RS232, RS485 and the extraneous interface of RS422.
[016] described WLAN adapter is selected communication modes by internal jumper.
Description of drawings
[017] Fig. 1: the structure chart of logistics RFID wireless local area network system of the present invention;
[018] Fig. 2: the WLAN adapter structure block diagram among the present invention.
Embodiment
[019] at bulk storage plant, particularly outdoor open depot, because the place is big, material and article of a great variety, traditional manual operation expends great amount of manpower and time, and goes wrong easily.In intelligent storage application combination system, in the warehouse a plurality of AP are installed, make the wireless signal of WLAN cover whole warehouse.The label of material and article has stored information such as the cognizance code of representing goods and supply unit and title.
[020] sets up combined system identification goods, and central database is carried out accessing wirelessly, make the entire process process of receiving, delivering and making an inventory of goods very convenient quick, and error rate significantly reduces.
[021] when material and article arrive or leave the warehouse, the information on fixed reader or the HR automatic reading label, and all data are passed to the storehouse management center by WLAN.Therefore, make material and article warehouse entry inspection, deposit, searching, outbound, the entire process process of inquiring about, making an inventory and distributing warehouse compartment, convenient and swift, and error rate significantly reduces, and solved the information management that relevant material and article flow effectively.The carrying out of whole process followed the tracks of at the storehouse management center always, thereby can be in real time and generate inventory stock report accurately easily.
[022] office worker is when carrying out an acceptance inspection, deposit, register, select, seeking goods and transporting, and the position of they and forklift need be moved.Roof or relevant local a plurality of AP that install at the goods yard building make the wireless signal of WLAN cover whole goods yard.Hand-held set can be roamed in the area of coverage, and by the inventory system that WLAN is connected to the goods yard, has solved operating personnel's flowability problem thus.
[023] when receiving, the office worker carries hand-held set near goods.In the recognition scope, the data of label can show on the LCDs of hand-held set, and enter central database by WLAN.The office worker also can import other related data at the miniature keyboard of hand-held set, and these data also enter central database by WLAN.Next, system feeds back to hand-held set with the storage place and the relevant data of this goods, and shows on display screen.Office worker and forklift driver deliver to storage place according to instruction with goods.When shipment, the shipment inventory that the office worker provides according to inventory management system arrives near the storage place of goods.As long as the label of goods enters in the recognition scope of hand-held set, hand-held set will identify the goods that will seek from stacks of cargo, and demonstrates the data of this shipments on display screen.The goods of making an inventory is identical with the method for receiving and delivering.Inventory management system the carrying out of whole process of following the tracks of always and receive, deliver and make an inventory, thus can be in real time and generate inventory stock report accurately easily.Read head is installed in exit in the goods yard, is used for discerning the goods that transports.When lorry will pass through the exit, read head was discerned the label of all goods.If all be the goods on the shipment inventory, read head can send voice suggestion, and opens the gate of passage, released goods automatically by control system.Meanwhile, inventory management system database new data more automatically.Otherwise, if inaccurate goods of letting pass is arranged, comprise being hidden in and grant in the goods packing case that transports that read head can automatically identify, the gate of closing passage, and send prompting.Therefore, the application combination system also can play the effect of anti-thefting monitoring to goods.
[024] at port and pier, the outdoor open-air large-scale goods yard of station or logistics center, because the place is big and goods and materials kind transportation is many, and the transhipment link is many, to visual having relatively high expectations in the case of fortune goods and materials, RFID technology and other technology can be combined and use, i.e. additional label on transporting supplies, and radio frequency reader is set at the transportation node of key, on haulage vehicle, equip simultaneously car-mounted device, set up accordingly at fortune logistics network visual control center, so that, improve visual real-time and effect directly perceived being implemented in the fortune logistics and transporting the visual while in the goods and materials case.
[025] in combined system, WLAN and RFID must coexist, and both radiofrequency signals are not disturbed mutually.Frequency division is preferably the simplest selection.Therefore, the WLAN in combined system selects the 2.4GHz frequency range for use, and RFID selects the 902MHz frequency range for use.They all are the open frequency ranges that can freely use, but transmitting power is subjected to predetermined restricted.
[026] as shown in Figure 1, in logistics progress, certain logistics storage ground have logistics goods A, B, C ..., X etc., read by a series of RFID readers respectively.This logistics RFID wireless local area network system has a plurality of RFID chips, and these RFID chips are placed in the various goods that need in the logistics progress to transport; The AP access point of a plurality of WLAN, described AP access point all are connected with a RFID reader and a WLAN adapter, and the message transmission of the RFID chip that described WLAN adapter receives the RFID reader is to the AP access point of the described WLAN of WLAN; One receives WLAN data computing machine; The number of described AP access point calculates as follows:
[027] (4) calculate computer network QoS value Q among the WLAN;
[028] (5) suppose that the ratio that the stored information of RFID chip accounts for total memory capacity is V, and the number of RFID chip is n;
[029] number of (6) described AP access point is that n multiply by Q divided by V.
[030] qos value of described computer network is to calculate according to the network traffics of improvement that comprises dedicated bandwidth, shake control and delay, packet loss and WLAN.
[031] stored information of the described RFID chip ratio that accounts for total memory capacity preferably is controlled at below 0.7, so that make the logistics RFID system of this WLAN receive that higher communication quality uses the less AP access point of number simultaneously.
[032] described WLAN adapter designs like this:
[033] 1. use RS485 standard industry bus anti T-R device to link to each other with computer, communication is connected by twisted-pair feeder, and working method is half-duplex, work baud rate 9600bps, and reliable transmission is apart from 1200m, and maximum buses articulate 127 equipment.The device address is controlled by toggle switch from 1-127.
[034] 2. has COM1, COM2 dual serial mouth, be used for linking to each other with other smart machine.COM1, COM2 are had RS232, RS485 (2 line), an extraneous interface of RS422 (4 lines or 5 lines, 6 lines), select communication modes by internal jumper.
[035] 3. has the input of 4 tunnel analog quantitys, the input of 8 road digital quantities, the output of 4 road digital quantities.
[036] wherein, all be that the input and output of digital quantity analog quantity adopt photoelectricity to isolate and overvoltage circuit, operate as normal is independent of each other between protection external equipment and the adapter.The fault-operation protection circuit is adopted in the output of four road digital quantities.Serial communication interface adopts the isolated from power power supply, and adopts photoelectric isolation technology between the main frame, has improved security of system.And this adapter has following specific targets:
[037] 1) can finish two kinds of protocol conversions
[038] 2) four tunnel analog quantitys inputs input range 0～+ the 5V certainty of measurement is less than 1%
[039] 3) eight road digital quantities input, the output of four road digital quantities
[040] 4) input current scope 4～20mA input voltage+5V output current scope 4～20mA
[041] 5) communication interface: standard RS232, RS485, RS422 interface
[042] 6) power supply: direct current 36～63V DC
[043] 7) operational environment: working temperature-10 ℃～55 ℃ of relative humidity 20～90%RH
[044] 8) overall dimension: 430 * 305 * 87 (mm)
[045] 9) power consumption: less than 15 watts
[046] global prevailing wlan product is operated in the 2.4GHz frequency range now.The frequency range of carrying out radio communication between mark and the reader is: below the low frequency 135KHz, and high frequency 13.56MHz, hyperfrequency 869MHz, 902～928MHz and microwave 2.4GHz, 5.8GHz.The communication distance of low frequency and high frequency is near, and message transmission rate is slow.The communication distance of high frequency, hyperfrequency and microwave is far away, and message transmission rate is fast.
[047] present, there are two technical standards in RFID: the UID standard of American-European EPC standard and Japan.The radio band that both use is different, and the EPC standard adopts hyperfrequency 902～928MHz, and the UID standard adopts 2.45GHz and 13.56MHz.WLAN in the combined system adopts the IEEE802.1lb standard.802.1lb be an expansion of 802.11, regulation adopts the 2.4GHz frequency range.It has increased by two new speed: 5.5Mbps and 11Mbps in the physical layer of 802.11 agreements.In order to realize this target, DSSS is selected as the only physical layer transmission technology of this technology, and this is because FHSS can't improve speed again on the basis of not violating the FCC principle.The modulation system of DSSS is DBPSK when 1Mbps, is DQPSK when 2Mbps, has adopted CCK when 5.5Mbps and 11Mbps, all uses QPSK as modulation technique.The radio frequency transmission of RFID can adopt the inductance coupling high mode, be called load-modulate again, be commonly used in in-plant low frequency and high frequency recognition system a radio frequency transmission also can adopt the electromagnetic backscatter coupled modes, be called backscattered modulation again, be commonly used in longer-distance hyperfrequency (as 902MHz) and microwave (as 2.4GHz) recognition system.In combined system, RFID adopts backscattered modulation, and operating frequency is the 902MHz frequency range.
[048] operation principle of backscattered modulation is: when passive label sends back to read head with data, label is according to the data-signal control antenna switch that will beam back, make the antenna of label be in impedance mismatching or impedance matching state, therefore tag reflection returns that the energy of read write line is corresponding also two kinds of big and little situations, has represented " 0 " and " 1 " in the binary signal respectively.
Claims (4)
1. WLAN adapter that is used for logistics RFID wireless local area network system, this WLAN adapter uses RS485 standard industry bus, be connected by twisted-pair feeder with the communication between the RFID reader, working method is half-duplex, has COM1, COM2 dual serial mouth, is used for linking to each other with other smart machine, and, this WLAN adapter has the input of 4 tunnel analog quantitys, the input of 8 road digital quantities, the output of 4 road digital quantities.
2. according to a kind of WLAN adapter that is used for logistics RFID wireless local area network system of claim 1, the power supply of described WLAN adapter adopts the DC-DC integrated module.
3. according to a kind of WLAN adapter that is used for logistics RFID wireless local area network system of claim 1, the COM1 of described WLAN adapter, COM2 have RS232, RS485 and the extraneous interface of RS422.
4. according to a kind of WLAN adapter that is used for logistics RFID wireless local area network system of claim 1, described WLAN adapter is selected communication modes by internal jumper.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101045983A CN101567826A (en) | 2008-04-22 | 2008-04-22 | WLAN adapter for logistics RFID wireless local area network system |
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| CNA2008101045983A CN101567826A (en) | 2008-04-22 | 2008-04-22 | WLAN adapter for logistics RFID wireless local area network system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104951872A (en) * | 2015-06-04 | 2015-09-30 | 湖州朗讯信息科技有限公司 | Material attribute and dynamic information inputting method |
| CN105228146A (en) * | 2014-06-30 | 2016-01-06 | 北京奇虎科技有限公司 | A kind of In-vehicle networking equipment based on RFID and authentication method thereof |
| CN105723327A (en) * | 2013-06-19 | 2016-06-29 | 美国邮政管理局 | System and method for providing real-time tracking of items in a distribution network |
-
2008
- 2008-04-22 CN CNA2008101045983A patent/CN101567826A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105723327A (en) * | 2013-06-19 | 2016-06-29 | 美国邮政管理局 | System and method for providing real-time tracking of items in a distribution network |
| CN105723327B (en) * | 2013-06-19 | 2019-03-22 | 美国邮政管理局 | System and method for providing real-time tracking of items in a circulation network |
| CN105228146A (en) * | 2014-06-30 | 2016-01-06 | 北京奇虎科技有限公司 | A kind of In-vehicle networking equipment based on RFID and authentication method thereof |
| CN104951872A (en) * | 2015-06-04 | 2015-09-30 | 湖州朗讯信息科技有限公司 | Material attribute and dynamic information inputting method |
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