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RFID reader question — Parallax Forums

RFID reader question

RikRik Posts: 2
edited 2008-05-21 21:03 in BASIC Stamp
I have just bought a Parallax RFID reader and want to create a connection with VB.NET like in the following article:
http://www.code-magazine.com/article.aspx?quickid=0611061&page=2
I connect the reader according to the attachment to the PC.

When I start the application and hold a TAG to the reader nothing is happening.

Does anybody know where I can find the error? Should the red LED turn into green when holding a TAG, or is there another way to see if the scanner is reading?

I have 4 different TAG's which I tried for this, which were enclosed with the reader.

Can anybody help me with this?
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Comments

  • Rob311Rob311 Posts: 83
    edited 2008-05-19 00:44
    Double check that you have the serial pins in the correct spot, i tend to wire them in reverse the first time (i confuse pin in and pin out).

    From what I remember of my toying with the RFID reader, you had to send it a signal to get ready to read. Have you done this?

    Did you try reading the port through hyper terminal to determine if its a software vs hardware issue?
  • RikRik Posts: 2
    edited 2008-05-19 20:43
    Hi Rob, thanx for your reply.

    I'm sure i have used the correct pins, because the pinnumber is also written in the connector.

    I have just tried to read it through the winndows hyperterminal, but it isn't receiving something, so i guess it is a hardware issue.

    I didn't send a signal to the reader, but how can I send a signal to the reader? It has the following pins:
    - VCC
    - /ENABLE
    - SOUT
    - GND
    Or do you mean I have to bring the /ENABLE pin low?
  • Levitis LeviathanLevitis Leviathan Posts: 32
    edited 2008-05-20 00:33
    I believe /ENABLE has to be low; when reading a tag the LED changes color momentarily.
  • Levitis LeviathanLevitis Leviathan Posts: 32
    edited 2008-05-20 00:33
    I believe /ENABLE has to be low; when reading a tag the LED changes color momentarily.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2008-05-21 21:03
    Hello,

    There is actually an application posted at the following link which may help you. The RFID Reader /ENABLE line must be LOW to read tags, but doesn’t automatically cause the LED to change color unless the application brings the /ENABLE line HIGH temporarily to disable continuous reads. Take care.

    http://forums.parallax.com/showthread.php?p=727719

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    Chris Savage
    Parallax Tech Support
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