Program RFID reader
In a passive RFID system including an RFID reader and RFID tag, generally involves 3 different frequencies of 125 kHz, 13.56 MHz and UHF. The RFID reader and RFID tag should be in the same frequency.
125Khz low frequency and 13.56mhz HF high frequency are designed to only read one tag at a time, while UHF can read multiple. Cost of RFID readers and the RFID tag can also vary wildly based on the frequency rating of the modules. Some of 125 kHz able to program by the RFID reader, but 13.56 MHz and UHF can write data by the program RFID reader.
Each RFID tag contains a unique ID and possibly other information. The passive RFID tag generally contains an antenna—actually a coil of wire—that when put near a reader creates a small charge that is enough to cause the tag to transmit its unique ID or information.
This information can be used to uniquely identify the RFID tag and thus identify whatever is associated with the given RFID tag.
The unique tag ID is the key to using RFID in a program. The unique ID sets one tag apart from all other tags. If you are tracking inventory, you can place a tag on an item and then associate the ID of the tag to that item. You've then given each item a unique key to access it by. For an example RFID access control system, If you have RFID credentials that you use to access an office building, If you scan that card, you can use the retrieved unique RFID credentials ID to then search your database for the RFID tag number and then get the associated information and identify if you allowed coming in.
Why the RFID reader able to identify the RFID credentials, that because you add additional information for the RFID Tag ID, or you put the RFID tag ID in your system.
Tag Memory
RFID tags store a lot of data in their memory and there can be many different types of identifying information stored in RFID tags .how to program the data by RFID reader writer?
For example, Gen2 RFID tags' memory of a tag is split into three: the TID, EPC, and User Memory.
Tag Identifier Memory
The TID or Tag Identifier is 20 bytes or 160 bits. These means there are 1,460,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 different possible tag IDs (1.46 * 1048). More than there are atoms in the human body! Not quite the number of atoms in the universe. Every RFID tag has a unique TID. The TID is not editable.
T Electronic Product Code Memory
While TIDs are good for absolute identification the Gen2 RFID standard was really created to replace the barcode in many retail environments. When you go to buy your groceries the register doesn't care if you have item TID 0xE242F3, it cares if you have a gallon of milk or a jar of peanut butter. That's where the Electronic Product Code (EPC) comes in: it's generally 12 bytes, user-editable, and meant to be written to as a UPC type replacement. Slap an RFID tag on the gallon of milk, program the tag's EPC to be 0 7874203641 0 and the register will identify it as a half-gallon of Lactose-Free 1% Low Fat Milk made by Great Value (random source). The tag doesn't care what you write to those 12 bytes so writing UHF RFID tag is perfectly acceptable but keep it below 12 bytes.
User Memory
The size of User Memory can vary from 0 bytes to 64 bytes. The cheaper the tag the fewer bytes of user memory it will likely have. What do you do with 64 bytes? To continue with the gallon-of-milk analogy, user memory was originally intended to record things like expiration dates. The EPC is the global identifier ('this is milk'), and the User Memory was specific to that gallon ('sell by August 15th'). Again, the tag doesn't care so consider recording user setting data (this user enjoys a 10-degree decline in the pilot seat) or use the memory as the world's smallest dead drop.
Passwords
There are additional writable memory locations called the Access password and Kill password. The Access password can be used to prevent people from re-configuring tags ("it may look like a sirloin steak but the register says it's a pack of gum..."). The Kill password is used to permanently and irrevocably disable a tag.
DO RFID reader manufacturer produce the 125Khz program RFID reader for T5577/EM4305 13.56Mhz program RFID reader writer for all High-frequency RFID cards and tags UHF long range RFID reader writer for EPC tag
