Mkpado Encoding & EPC Memory

Mkpado EPC Gen2 ọ bụla nwere kpọmkwem ụlọ akụ ebe nchekwa 4, nke ọ bụla na-eje ozi maka otu ebumnuche. Ịghọta usoro a dị mkpa maka koodu, ịgụ, na ichekwa mkpado gị.

Ụlọ akụ 00 (Edebere): Nwere Paswọọdụ Igbu 32-bit na Paswọọdụ Nweta 32-bit. Uru ndabara bụ 0x00000000. Paswọọdụ igbu na-eme ka mkpado ahụ gbanyụọ na-adịgide adịgide mgbe e zigara ya. enweghị ike ịgbanwe ya. Paswọọdụ nnweta na-emechi ụlọ akụ ebe nchekwa iji gbochie ederede na-enweghị ikike.

Ụlọ akụ 01 (EPC): Nwere StoredCRC (16 bits, gbakọọ onwe ya), StoredPC/Protocol Control (16 bits, na-egosi ogologo EPC na ikike mkpado), na uru EPC n'onwe ya. na-abụkarị 96 bits (12 bytes) maka SGTIN-96. Ụfọdụ mkpado na-akwado EPC 128-bit ma ọ bụ ọbụna 496-bit.

Ụlọ akụ 10 (TID): Ihe njirimara mkpado mmemme ụlọ ọrụ. Nwere koodu onye nrụpụta mgbawa, nọmba ụdị, na nọmba serial pụrụ iche. Ụlọ akụ a bụ naanị ịgụ ma enweghị ike ịgbanwe ya. na-eme ka ọ dị oké ọnụ ahịa maka mgbochi aghụghọ na nkwenye mkpado.

Ụlọ akụ 11 (Onye ọrụ): Nchekwa agbakwunyere nhọrọ. Nha dị iche site na mgbawa: NXP UCODE 9 nwere 0 bits (enweghị ebe nchekwa onye ọrụ), Quanray QStar-7U nwere 512 bits (64 bytes). Jiri ya maka nọmba batch, ụbọchị nyocha, oke okpomọkụ, ma ọ bụ ndekọ mmezi. Na-enyocha mgbe niile ikike dịnụ tupu ide.

SGTIN-96 bụ usoro EPC a na-ejikarị eme ihe. Ọ na-akọwa GTIN-14 (koodu ngwaahịa gị) gbakwunyere nọmba serial pụrụ iche n'ime bits 96 (bytes 12). Nke a na-enye ohere ruru ijeri 274 pụrụ iche nọmba serial kwa ụdị ngwaahịa.

Usoro 96-bit: Isi (bits 8, mgbe niile 0x30 maka SGTIN-96) → Filter (bits 3: 0=niile, 1=POS, 2=ikpe zuru ezu, 3=edobere, 4=ime ngwugwu, 5=edobere, 6= ibu otu, 7=ihe) → Nkewa (bits 3: na-akọwa otú e si ekewa bits n'etiti ụlọ ọrụ prefix na ihe ntụaka) → Ụlọ ọrụ Prefix (bits 20–40) → Ihe ntụaka (bits 4–24) → Nọmba Serial (bits 38).

Uru Nkewa (0–6) na-ekpebi ogologo Ụlọ Ọrụ Prefix: P=0 → 40-bit prefix (12 ọnụọgụgụ), P=1 → 37-bit (11 ọnụọgụgụ), P=2 → 34-bit (10 ọnụọgụgụ), P=3 → 30-bit (9 ọnụọgụgụ), P=4 → 27-bit (8 ọnụọgụgụ), P=5 → 24-bit (7 ọnụọgụgụ), P=6 → 20-bit (6 ọnụọgụgụ). Ogologo ụlọ ọrụ GS1 gị na-ekpebi uru nkewa ị ga-eji.

┌────────┬──────┬─────┬──────────────┬──────────────┬──────────────┐
│ Header │Filter│Part │Company Prefix│Item Reference│   Serial     │
│ 8 bits │3 bits│3bits│  20-40 bits  │   4-24 bits  │   38 bits    │
│  0x30  │ 0-7  │ 0-6 │  GS1 prefix  │  product ref │  unique ID   │
└────────┴──────┴─────┴──────────────┴──────────────┴──────────────┘

Partition table (defines prefix/item bit allocation):
P=0: 40-bit prefix (12 digits)  P=4: 27-bit prefix (8 digits)
P=1: 37-bit prefix (11 digits)  P=5: 24-bit prefix (7 digits)
P=2: 34-bit prefix (10 digits)  P=6: 20-bit prefix (6 digits)
P=3: 30-bit prefix (9 digits)

Example: 3034257BF7194E4000001A85
  Header=0x30 Filter=1 Part=5 Prefix=0614141
  Item=812345 Serial=6789 → GTIN-14: 80614141123458

Na mgbakwunye na SGTIN-96, GS1 na-akọwa ọtụtụ atụmatụ EPC 96-bit ndị ọzọ maka njirimara usoro njikwa dị iche iche. Onye ọ bụla nwere byte isi nke ya.

Ịgụ mkpado n'oge ndekọ bụ passive. onye na-agụ na-agbasa ajụjụ na mkpado na-aza site na EPC ha sitere na Ụlọ akụ 01. Mana ị nwekwara ike ịgụ ụlọ akụ ebe nchekwa ọ bụla site n'ịziga iwu READ nwere nọmba ụlọ akụ, ntụgharị okwu, na ọnụọgụ okwu.

Ide ederede na mkpado chọrọ izi ezi karịa. A ga-eme ka mkpado ahụ bụrụ otu (otu mkpado na-aza), ma ederede na-eme otu okwu (16 bits) n'otu oge. Ederede EPC zuru ezu nke 96-bit chọrọ ederede okwu 6 n'usoro. Ederede ọ bụla na-ewe 10–20ms, yabụ ịkọwa otu mkpado na-ewe 60–120ms maka data EPC naanị.

Ihe ndabara ederede: Mkpado dị anya site na antenna (chọrọ mgbaàmà siri ike maka ederede karịa ịgụ. wetara mkpado n'ime 1m). Ọtụtụ mkpado n'ọhịa (singulation dara. kewapụ mkpado ebumnuche). Emechiri ebe nchekwa mkpado (achọrọ paswọọdụ nnweta). Ederede gosipụtara dara (gbalịa ọzọ, ma ọ bụ mkpado nwere ike ịbụ ntụpọ. ọnụego ntụpọ nkịtị bụ 1–3 kwa 10,000).

TX → 5A 00 01 02 11 00 0C [EPC_12_BYTES] [CRC16]

Write per 16-bit word: 10-20ms
Full 96-bit EPC = 6 words = 60-120ms total

With access password:
TX → 5A 00 01 02 11 00 10 [PWD_4B] [EPC_12B] [CRC16]

EPC Gen2 tags na-akwado paswọọdụ 32-bit abụọ maka nchekwa. Paswọọdụ nnweta na-egbochi ụlọ akụ ebe nchekwa. ozugbo edobere ya, ụlọ akụ ahụ chọrọ paswọọdụ tupu arụmọrụ ọ bụla ma ọ bụ dee. Paswọọdụ igbu na-emechi tag na-adịgide adịgide mgbe a na-ebufe ya. arụmọrụ na-apụghị ịgbanwe agbanwe nke a na-ejikarị maka nzuzo ndị ahịa na ụlọ ahịa (na-ebibi tag mgbe ịlelechara).

Usoro nchekwa kacha mma: Ejila ndabara paswọọdụ niile-efu (0x00000000) na mmepụta. ọ na-enye efu nchekwa. Mepụta paswọọdụ pụrụ iche kwa tag batch ma ọ bụ jiri prefix ụlọ ọrụ gị dị ka mkpụrụ. Chekwaa paswọọdụ na sistemụ azụ gị, ọ dịghị mgbe na tag n'onwe ya (enwere ike ịgụ ebe nchekwa paswọọdụ ma ọ bụrụ na tag ahụ meghere). Kpọchie ụlọ akụ paswọọdụ mgbe mmemme. Tụlee ọnọdụ Untraceable (dị na mgbawa ọhụrụ) nke na-ezo TID ma na-ebelata EPC, na-enye nzuzo na-egbughị tag.

GS1 Digital Link na-ejikọta mkpado RFID anụ ahụ na ozi dijitalụ nwere ike ịnweta weebụ. Ọ na-atụgharị data EPC ka ọ bụrụ URI ọkọlọtọ nke na-edozi ozi ngwaahịa, ọrụ nkwenye, ọkwa ncheta, ma ọ bụ data nkwado.

Usoro: Tag EPC (dịka, 3034257BF7194E4000001A85) → Decode to GTIN-14 (80614141123458) + Serial (6789) → Wulite URI: https://id.gs1.org/01/80614141123458/21/6789. URI a nwere ike idozi na ibe ngwaahịa gị, API nkwenye, ma ọ bụ ọrụ ọ bụla edebanyere aha na netwọk GS1 Digital Link.

Ojiji bara uru: Nyochaa uwe a na-etinye akara na ụlọ ahịa → URI na-edozi ntụziaka nlekọta ngwaahịa, ntuziaka nha, na asambodo nkwado. Nyochaa ọgwụ a na-etinye akara → URI na-edozi nkwenye (ngwaahịa a ọ bụ ezigbo?), ụbọchị njedebe, na ọnọdụ ncheta. Nyochaa akụ a na-etinye akara → URI na-edozi akụkọ ihe mere eme na usoro nyocha.