2021-08-20 02:58 AM
Hi.
I'm graduate student, researching UHF passive RFID tag, in Dongguk university, Seoul, Korea.
Thanks to offer materials like documentations, video. It was really helpful for my study.
Before purchase the ST25RU3993-HPEV to measure research results, I want to check some questions.
At page 39 and 49 of ST25RU3993 datadheet, document says "In EPC Class 1 Gen2 protocol, the decoder supports long Rx preamble (TRext=1) for FM0" and "Short preamble is supproted for Miller 4 and Miller 8 coding". I wondering it means "FM0 coding can't use short Rx preamble (TRext=0) to communicate with ST25RU3993".
At page 48 of same document, if I set Rx_crc_n=1 (Rx without CRC), does it mean ST25RU3993 never check CRC for all received data from a tag?
Finally, at UM2268 User manual (about ST25RU3993 GUI software), I want to know can I custom commands like Read/Write.
Thanks for your help.
Solved! Go to Solution.
2021-08-26 04:37 AM
Hello MYoun.4
Cheers,
B
2021-08-26 04:37 AM
Hello MYoun.4
Cheers,
B
2021-08-27 11:20 PM
Hi Bart Herse.
I really appreciate your answer.
I want to know three more things about ST25RU3993-HPEV.
I'm really thanks for your help.
2021-08-31 12:37 AM
Hi Bart Herse.
I read all documentations about ST25RU3993-HPEV.
Sorry to bother you, but I have three last questions.
At page 56 of User manual ST25RU3993 evaluation board software, Figure 49 shows tag settings dialog window.
I'm really thanks for your help :)
2021-09-14 06:08 AM
Dear MYoun.4,
1.: CRC-16 will not be checked by the reader IC. The CRC-16 will be put into the FIFO so that the MCU can fetch it and process it.
2.: How the tag ends its frame cannot be altered by the reader. If the question is , if ST25RU3993 can decode FM0, then the answer is yes.
3.: The EPC data is received upon the ACK command. As the length field in the PC defines the EPC ´length in number of WORDS (2 bytes), a 1-bit EPC data length is per my knowledge not possible.
Cheers,
B
2021-09-15 12:44 AM
Hello MYoun.4,
ad 1
EPC truncation is currently not supported. In the GUI you can not send a select with truncation enabled. The SDK has this parameter for the select command, but only for future use, not yet implemented in FW.
ad 2
yes, when the TAG settings dialog pop-up then the GUI select the TAG and read the TID in background.
ad 3
The TAG settings dialog in the Reader Suite GUI shall provide some information about the TAG and allow an user to access TAG memory with the Gen2 access command as defined in the Gen2 specification.
All you see in this dialog is a visual presentation of the execution of the Gen2 Read/Write/Lock/Kill and Access commands. Except the Generic command that allows user to built up their own commands
BR
Nick