checking LIN signal with measurement only up to 10V range

Discussion in 'Automotive Electronics' started by David Vybíral, May 25, 2016.

  1. David Vybíral

    Thread Starter New Member

    May 25, 2016
    2
    0
    Hello, I need to monitoring communication on LIN bus. I have measurement which is possible to measuring only up to 10 V range, but on Lin is over 10V. How can I simply reduce voltage level without affected communication data flow.
     
  2. bwilliams60

    Active Member

    Nov 18, 2012
    722
    88
    What are you working on and what is an LIN bus?
     
  3. #12

    Expert

    Nov 30, 2010
    16,261
    6,770
    Use 2 resistors to diminish the input to your measuring device.
     
  4. David Vybíral

    Thread Starter New Member

    May 25, 2016
    2
    0
    LIN is local interconnect network, mostly using in cars electronics control unit, signal is moving between 0 - 13,5 Volts , in my case would like to trigger logical 1 on LIN, if I used standart oscilloscope it is simply, but I have instead of oscilosope Data acquisition unit it has weaker range unlike of oscilloscope, only 10V range for analog input.

    upload_2016-5-26_7-3-47.png
     
  5. bwilliams60

    Active Member

    Nov 18, 2012
    722
    88
    If I understand you correctly, are you referring to the CAN BUS that all vehicles now incorporate for communication between modules? What protocol are you working with?
    LIN was a protocol used back in the 90's on European vehicles if I am not mistaken? What vehicle are you working with?
     
  6. cork_ie

    Member

    Oct 8, 2011
    348
    58
    LIN stands for Local Interconnect Network. It is a slow speed, single wire network, which is very different to CAN.
    The most notable differences are:
    1) That it operates in Master -Slave mode and
    2) The reference voltage is 12V . Data on the bus is either recessive (logic HIGH) or dominant (logic LOW)

    Thus if you need to check for LIN data you will need to check for logic voltage variations with respect to 12V+ and not with respect to 0V.
    I am sure your meter or measuring device will work fine for detecting data on the bus.
     
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