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RI-STU-MRD2 continuous mode behavior

Shinya Muramatsu
Expert 1010 points
Other Parts Discussed in Thread: RI-STU-MRD2, RI-TRP-DR2B

Hello,I'm FAE of distributor in Japan.

My customers evaluated TI-tag and RI-STU-MRD2 now.

They are using continuous mode(CRDM=1),and ask some questions.

in case of continuous mode and without synchronization,

1) when there is no tag in reading range,it read tag every 100ms.(10 readouts/S in P16 scbu049.pdf)

    But there is a tag,cycle time change to over 150mS after response. Why?

2)which timing TXD serial data output start  at Read-only timing chart in P24 scbu049.pdf?

3)can they adjust RI-STU-MRD2 ANT output power current? because they want to expand more reading range.

 

Regards,

Shinya Muramatsu

  • 0
    TI__Guru* 91206 points

    Muramatsu-san,

    Power Burst in this mode is 50mSec, with 10 readouts per second.

    Response time from the transponder is ~20mSec. (for General Read of R/O or R/W)

    if you are using an MPT, the overall is extended by about 16mSec because the page address is being sent.

    and then the transmission of the data over UART back to PC GUI is also needing to be accounted for.

    regarding # 3

    what sort of read distance are you looking for, and with which transponder type/size?

    see attached for some ideas (pages 34 - 38)

    8863.LF Antenna Design.pdf

  • 0 in reply to Josh Wyatt
    Expert 1010 points
    Josh-san

    Thank you for your support.
    Now they use default setting,except CRDM=1,and it means Read-Only mode.
    I confirmed Their evaluation waveform,after respons cycle is over 150mS.
    But it seems to finish tansmitting UART on TXD in 100mS.
    What happen intenal RI-STU-MRD2.
    I can't attach the waveform in public web,please change private session.

    Thanks for Antenna information.
    They want to use 23 or 32mm glass transponder and they need to communicate 10-15cm.
    But they don't want to large Antenna size,I think it means large LF output power at LF-leader side.
    If you can introduce other LF-reader,please inform us.

    Regards,
    Shinya Muramatsu
  • 0 in reply to Shinya Muramatsu
    TI__Mastermind 28745 points

    Hey Shinya,

    I tested with the MRD2 with CRDM = 1, and although I didn't measure it yet, I can observe a change in polling frequency.  I believe the root cause is what Josh mentioned, but just in another order.  

    • No Tag Response Loop == 50ms Charge, + Wait for response (~20 ms) + Delay (30-50 ms) = 100ms

    • Tag Response Loop == 50 ms Charge + 20 ms response + UART Comms (30 ms) + Delay (30-50 ms) = 130-150 ms.

    Is the change in polling cycle an issue or just an observation?  

    As for higher power solutions, we offer the RI-RFM-007B + RI-CTL-MB2B + antenna solutions.  

    For read ranges with this device, please refer the to attached .pdf.

    LFreadranges.pdf

    Thanks,

    JD

  • 0 in reply to JD Crutchfield
    Expert 1010 points
    John-san,Josh-san

    Thanks a lot for your support.
    I understood sequence,but your information is diffrent from customer's evaluated time as follow.
    UART Comms 30ms,but 16ms for their evaluation time.
    Delay 30-50 ms,but max 92mS for their evaluation time.
    Do you know max Delay time?
    And Why is UART comms time diffrent?
    They didn't config from default setting,only input high to CRDM pin.

    And very thanks for Recommend LF-reader information.
    I introduced them.

    Regards,
    Shinya Muramatsu
  • 0 in reply to Shinya Muramatsu
    TI__Guru* 91206 points
    which tag are the using? (R/O, R/W, MPT, SAMPT, etc.)
  • 0 in reply to Josh Wyatt
    Expert 1010 points
    Josh-san
    Sorry too late reply.
    They used MPT tag(RI-TRP-DR2B),but they configed R/O format(default) to MRD2.
    We think RI-TRP-DR2B can use R/O format,is it correct?

    Regards,
    Shinya Muramatsu
  • 0 in reply to Shinya Muramatsu
    TI__Guru* 91206 points

    The -DR2B is a Multi-Page Transponder (MPT) - the contents of page one can be read out with a charge only read, and would return 128 bits versus 112 bits response that an R/O tag returns 

    then to read the rest of the transponder, the General Read Page (page address + command) must be used for pages 2 - 17.

    this would add ~16mSec to each command for total of ~86mSec per page read (50mSec (charge) + 16mSec (page address) + 20mSec (read)) 

  • 0 in reply to Josh Wyatt
    Expert 1010 points
    Josh-san,John-san
    Thank you for quick response,It is correct my understanding.
    I have total 2questions(one is already asked,one is new)

    Please inform max delay time as follow.
    > I understood sequence,but your information is diffrent from customer's evaluated time as follow.
    > UART Comms 30ms,but 16ms for their evaluation time.
    > Delay 30-50 ms,but max 92mS for their evaluation time.
    > Do you know max Delay time?

    And one more new question.
    Which page is UID(R/O)?
    There is R/O page P3 in datasheet(scbs842b.pdf).
    But I couldn't find page number of R/O.
    I checked page 1 is programable.

    Best regard
    Shinya Muramatsu.
  • 0 in reply to Shinya Muramatsu
    Expert 1010 points
    Josh-san,John-san

    Please inform max delay time as follow.
    > I understood sequence,but your information is diffrent from customer's evaluated time as follow.
    > UART Comms 30ms,but 16ms for their evaluation time.
    > Delay 30-50 ms,but max 92mS for their evaluation time.
    > Do you know max Delay time?

    And other question.
    Which page is UID(R/O)?
    There is R/O page P3 in datasheet(scbs842b.pdf).
    But I couldn't find page number of R/O.
    I checked page 1 is programable and page 17 is all0.
    I wonder R/O page is wrong description in datasheet.

    Best regard
    Shinya Muramatsu.