Aikawa Mai Karatu da yawa

Yawancin lokuta ana tura RFID a cikin samarwa suna buƙatar masu karatu da yawa suna aiki tare. Wani gidan ajiya na yau da kullun na iya samun masu karatu 4-8 a ƙofofin tashar jiragen ruwa da 2-4 a kowane layin conveyor. duk suna ciyar da bayanai cikin tsakiyar tsaka-tsaki wanda ke cire kwafi, tace, da kuma tura abubuwan tag zuwa tsarin kasuwanci (WMS, ERP, TMS).

Gine-ginen yana da yadudduka uku: Edge (masu karatu + eriya a wuraren karatu na zahiri), Tsaka-tsaki (sarrafa abubuwan da suka faru, cire kwafi, dabaru na kasuwanci), da Haɗin kai (haɗin API zuwa WMS/ERP/TMS). Tsarin tsaka-tsaki yana da mahimmanci. yana canza karatu na tag (EPC + eriya + RSSI + timestamp) zuwa abubuwan kasuwanci masu ma'ana kamar 'an karɓi pallet a tashar jirgin ruwa 3' ko 'an ɗora akwati a kan motar B'.

Tsarin hanyar sadarwa: Kowane mai karatu da aka gyara yana haɗi ta Ethernet (wanda aka fi so don amincewa) ko Wi-Fi. Yi amfani da keɓaɓɓen VLAN don zirga-zirgar RFID don ware shi daga zirga-zirgar hanyar sadarwa gaba ɗaya. Matsakaicin bandwidth: 1-5 Mbps a kowane mai karatu yayin aikin jari. Tabbatar ≤50ms latency na hanyar sadarwa don aikace-aikacen ainihin lokaci. Yi amfani da sa ido na bugun zuciya don gano gazawar mai karatu. mai karatu da ke kan layi a ƙofar tashar jirgin ruwa yana nufin rasa jigilar kaya.

Idan na'urori masu karatu da yawa suna aiki kusa da juna, siginar RF ɗinsu na iya tsoma baki. Akwai manyan dabaru guda uku na haɗin gwiwa, kowanne da ciniki-kashe:

Frequency Hopping Spread Spectrum shine babban hanyar sarrafa tsangwama a yankuna kamar Vietnam (920-925 MHz). Mai karatu yana canzawa da sauri tsakanin tashoshi yayin zagaye na kayan tarihi, yana tabbatar da cewa ko da masu karatu biyu sun yi karo a tashar guda, sun rabu a kan tsalle na gaba.

Ingantaccen tsarin FHSS: Saita kowane mai karatu tare da abin rufe fuska na tashar da ke bayyana wace tashoshi za a yi amfani da su. Don masu karatu 2 da ke kusa, sanya abin rufe fuska. Mai karatu A yana amfani da tashoshi [0, 2, 4, 6, 8] kuma Mai karatu B yana amfani da tashoshi [1, 3, 5, 7, 9]. Wannan yana ba da garantin sifili. Ga masu karatu 3, raba zuwa ƙungiyoyi na tashoshi 3-4 kowanne.

Gudun tsalle na tashar yana da mahimmanci: saurin tsalle yana rage yiwuwar ci gaba da karo amma yana ƙara sama. Yawancin masu karatu suna tsalle bayan kowane zagaye na kayan tarihi (kowane 100-400ms). Umurnin NRN protocol SET_WORKING_FREQUENCY yana saita jerin tashar. misali, bytes [0, 2, 4, 6, 8, 10] saita tashoshi 0 zuwa 10 tare da sararin 1 MHz.

SET_WORKING_FREQUENCY payload:

2 readers (zero overlap):
  Reader A: [0, 2, 4, 6, 8]   → 920.0, 921.0, 922.0, 923.0, 924.0
  Reader B: [1, 3, 5, 7, 9]   → 920.5, 921.5, 922.5, 923.5, 924.5

3 readers:
  Reader A: [0, 3, 6, 9]      → 920.0, 921.5, 923.0, 924.5
  Reader B: [1, 4, 7, 10]     → 920.5, 922.0, 923.5, 925.0
  Reader C: [2, 5, 8]         → 921.0, 922.5, 924.0

Yanayin Mai Karatu mai yawa fasali ne na EPC Gen2 wanda aka tsara musamman don yanayin da akwai masu karatu da yawa kusa da juna (>2 masu karatu a cikin 3m). DRM yana amfani da ƙaramin bandwidth na tashar da amsoshi na alamar Miller don rage tsangwama tsakanin masu karatu.

Ciniki-kashe na DRM: Kunna DRM yana inganta haɗin gwiwar masu karatu da yawa sosai amma yana rage aikin mai karatu guda ɗaya. ƙaramin bandwidth yana nufin ƙarancin fitar da bayanai a kowane mai karatu. A aikace, mai karatu a cikin yanayin DRM yana yin kayan tarihi game da 20-30% a hankali fiye da yanayin daidaitacce, amma aikin matakin tsarin yana inganta saboda masu karatu ba sa toshe juna.

Yaushe za a kunna DRM: Fiye da masu karatu 2 a cikin mita 3 na juna. Masu karatu a ƙofofin tashar jiragen ruwa da ke kusa waɗanda za su iya 'ganin' alamun juna. Shigarwa na siyarwa na rufin rufi. Yaushe za a kashe DRM: Masu karatu ware tare da >5m rabuwa. Aikace-aikacen hannu na mai karatu guda ɗaya. Ramin conveyor tare da kariya mai kyau ta RF.

Yunwar alama tana faruwa ne lokacin da aka tsallake wasu takamaiman alamomi a cikin yawan jama'a akai-akai yayin zagayen kayan. Wannan yawanci yana faruwa ne saboda alamomi masu ƙarfi (kusa da eriya, mafi kyawun jagora) suna mamaye hankalin mai karatu, kuma alamomi masu rauni ba su taɓa samun damar amsawa ba.

Gano: Kula da ƙimar ƙididdigar alamar ku ta musamman vs jimlar ƙididdigar karatu. Idan kuna karanta alamomi na musamman 50 amma kuna samun jimlar karatu 5000, ana sake karanta alamomi masu ƙarfi 100× yayin da alamomi masu rauni ke yunwa. Matsakaicin lafiya shine alamomi na musamman × 3–10 = jimlar karatu.

Dabarun rage: Yi amfani da ingantaccen ƙimar Q (ƙasa sosai = karo yana haifar da alamomi masu rauni su rasa, sama da yawa = zagaye a hankali). Kunna ci gaba na zama (S2/S3) don haka alamomin da aka riga an karanta su yi shiru. Juya mai da hankali kan eriya ta hanyar jeri ta tashar eriya. Daidaita matakan wuta don ƙirƙirar ƙarin ɗaukar hoto. rage wuta akan eriya da ke nuna alamomi kusa, ƙara wuta akan eriya da ke rufe wurare masu nisa. Yi amfani da tutar 'manufa' don canzawa tsakanin jagororin kayan A→B da B→A.

Ingantaccen fasaha: Ai gudanar da umarnin 'zaɓi' don raba yawan alamar zuwa ƙungiyoyi da kayan kowane rukuni daban. Wannan yana da tasiri musamman ga al'ummomin da aka gauraya inda ƙananan alamomi na matakin abu suna tare da manyan alamomi na matakin pallet.

Waɗannan tsarin an tabbatar da su a cikin aiki da kuma wakiltar mafi kyawun ayyuka don yanayin gama gari.