How to calculate CRC16 checksum for iButton

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  1. - 21st February 2008, 06:57 #1
    mech962784's Avatar
    mech962784
    mech962784 is offline Junior Member
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    Daer Andre
    can you please post the circuit schematic for such code?

    i want to know what is the use for the
    PORTB.4 = 1
    PORTB.5 = 0

    any clue?

    best regards
  2. - 26th February 2008, 15:34 #2
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    Andre_Pretorius
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    Have you read the document emplementing modbus on serial comms,
    You can get it at www.modbus.org
  3. - 27th February 2008, 05:28 #3
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    mech962784
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    Dear Andre

    yes i have the modbus specification.

    but these pins or at least PortB.5 is not something related to the specification,i think it is related to RS485 handshaking (correct me if i am wrong).

    is it correct?and which pin it is connected to?
  4. - 17th March 2008, 19:48 #4
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    Talking

    Sorry for the delay
    Yes pin portb.5 is for rs485 communication but this part is not working yet still need to try and find out why
    ps. any idea why it does not work
    Portb.4 is only showing running
    Hope this help
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