Selection, setup and standards guides for RFID and NFC readers.https://www.henrium.comhttps://www.henrium.com/guides/125khz-vs-13-56mhz-rfid-readerhttps://www.henrium.com/guides/125khz-vs-13-56mhz-rfid-reader125kHz vs 13.56MHz compared: EM4100 vs MIFARE and NTAG cards, read range, security and reader outputs, plus 4 quick checks to identify the card you have.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/can-a-phone-read-a-pet-microchiphttps://www.henrium.com/guides/can-a-phone-read-a-pet-microchipNo: phone NFC works at 13.56MHz and ISO pet microchips at 134.2kHz, so no app can read one. See what microchip apps do and which add-on readers work.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/em4100-tk4100-cards-explainedhttps://www.henrium.com/guides/em4100-tk4100-cards-explainedEM4100 vs TK4100 125kHz cards: the fixed 64-bit code, why one card shows as 10-digit decimal, 8-digit hex or 212,12687, and read range by card and fob.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/fdx-b-vs-hdx-animal-tagshttps://www.henrium.com/guides/fdx-b-vs-hdx-animal-tagsFDX-B and HDX tags carry the same ISO 11784 ID but reply in different ways at 134.2kHz. Compare signal, range and uses, then check what your reader reads.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/fixed-vs-integrated-vs-handheld-uhf-readerhttps://www.henrium.com/guides/fixed-vs-integrated-vs-handheld-uhf-readerFixed, integrated or handheld UHF RFID reader? Compare read zones, rated ranges from 5 cm to 20 m, outputs and install work by job, plus a checklist.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/iso-11784-11785-animal-id-numberhttps://www.henrium.com/guides/iso-11784-11785-animal-id-numberHow ISO 11784 builds the 64-bit animal ID and ISO 11785 sends it at 134.2kHz: bit layout, country vs manufacturer codes and a worked 15-digit example.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/iso-14443-vs-iso-15693https://www.henrium.com/guides/iso-14443-vs-iso-15693ISO 14443 proximity cards vs ISO 15693 vicinity tags at 13.56 MHz: range, field strength, UID, anticollision, typical chips and which reader reads which.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/keyboard-wedge-rfid-readerhttps://www.henrium.com/guides/keyboard-wedge-rfid-readerA keyboard wedge is a reader the PC sees as a USB keyboard: it types each card number at the cursor, no driver needed. Compare HID, virtual COM and PC/SC.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/magnetic-stripe-tracks-1-2-3https://www.henrium.com/guides/magnetic-stripe-tracks-1-2-3Track 1 holds up to 79 letters and digits at 210 bpi, Track 2 up to 40 digits at 75 bpi, Track 3 up to 107 digits. Sentinels, HiCo vs LoCo, reader choice.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/mifare-classic-ultralight-ntag213-reader-compatibilityhttps://www.henrium.com/guides/mifare-classic-ultralight-ntag213-reader-compatibilityMIFARE Classic, Ultralight and NTAG213 compared: 4- vs 7-byte UID, 48 to 3,440 bytes of memory, security, and what a 13.56MHz UID reader can read.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/nfc-reader-vs-rfid-readerhttps://www.henrium.com/guides/nfc-reader-vs-rfid-readerNFC readers and phones work only at 13.56MHz, so they cannot read 125kHz EM4100 cards, pet microchips or UHF tags. See a frequency map and what to use.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/read-rfid-card-number-into-excelhttps://www.henrium.com/guides/read-rfid-card-number-into-excelRead RFID card numbers into Excel with a USB keyboard reader: keep leading zeros on 10-digit IDs, timestamp each read, flag repeats and look up names.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/rfid-card-number-formatshttps://www.henrium.com/guides/rfid-card-number-formatsWhy one RFID card shows up as 0793541918, 2F4C7D1E or 076,32030: decimal, hex, byte order and Wiegand 26 formats worked through, plus a checklist.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/rfid-reader-interfaces-usb-rs232-rs485-wiegandhttps://www.henrium.com/guides/rfid-reader-interfaces-usb-rs232-rs485-wiegandCompare RFID reader interfaces: USB keyboard or COM, RS232 to about 15 m, RS485 to 1,200 m, Wiegand 26/34 and TCP/IP, plus wiring tips and a checklist.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/rfid-reader-not-reading-cardshttps://www.henrium.com/guides/rfid-reader-not-reading-cardsRFID reader not reading cards? Work through 10 checks in order: power, 125kHz vs 13.56MHz mismatch, card range, output focus, number format and UHF setup.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/sourcing-oem-rfid-readershttps://www.henrium.com/guides/sourcing-oem-rfid-readersHow to source RFID readers step by step: an RFQ template, firmware vs hardware options, a 1–3 unit sample test plan and the terms to get in writing.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/uhf-rfid-frequency-bands-by-countryhttps://www.henrium.com/guides/uhf-rfid-frequency-bands-by-countryUHF RFID frequency by country: 902–928 MHz in the US, 865.6–867.6 MHz in the EU, 920.5–924.5 MHz in China, with power limits and a band ordering checklist.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/uhf-rfid-multi-tag-read-ratehttps://www.henrium.com/guides/uhf-rfid-multi-tag-read-rateRead every tag in a UHF count: how Gen2 anti-collision works, choosing Q and sessions S0–S3, RF power and antenna layout, plus a pilot test you can repeat.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/uhf-rfid-read-rangehttps://www.henrium.com/guides/uhf-rfid-read-rangeWhy UHF RFID read range runs from 5 cm to 20 m: EIRP limits, antenna gain, tag chip and size, metal and liquids, plus a field test checklist for your site.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/usb-c-nfc-reader-android-otghttps://www.henrium.com/guides/usb-c-nfc-reader-android-otgSet up an external NFC or RFID reader on an Android phone over USB-C: OTG host mode, 5 V/100 mA power, keyboard layout, output format and 0–30 mm range.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/wiegand-26-vs-34https://www.henrium.com/guides/wiegand-26-vs-34Wiegand 26 sends an 8-bit facility code and 16-bit card number; Wiegand 34 sends all 32 ID bits. Bit layouts, parity, worked examples and a checklist.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/wiegand-reader-wiringhttps://www.henrium.com/guides/wiegand-reader-wiringWiegand wiring diagram with D0/D1, 12 V power and LED wire colors, 22 vs 18 AWG voltage drop, cable distance limits and a fault table for installers.Tue, 29 Sep 2026 00:00:00 GMThttps://www.henrium.com/guides/write-uhf-rfid-tags-epc-tid-user-memoryhttps://www.henrium.com/guides/write-uhf-rfid-tags-epc-tid-user-memoryWrite UHF RFID tags right: what goes in the 96-bit EPC and user memory, why the TID is fixed, how passwords and lock work, plus an encoding checklist.Tue, 29 Sep 2026 00:00:00 GMT