5 Comments

  1. yamini

    Thank You… Good Job.. Your website is really helpful.. God bless u..

    Reply
    1. admin

      Thank you Yamini!!!!

      Regards,
      Sivaprasad.CH

      Reply
    2. admin

      Thank you Yamini!!!

      Regards,
      Sivaprasad.

      Reply
  2. Vamshi Kathroji

    Hello,

    Please add following things.

    SSM for Discrete Signals:
    00- Normal Operation
    01-No Computed Data
    10-Functional Test
    11-Failure Warning.

    SSM Details as follows:
    Normal Operation: Data Valid.
    Failure Warning: Invalid data, Data to be suspect or missing, Indicates failure.
    Functional Test: Data being produced by test source, Its valid on ground invalid on flight mode.
    No Computed Data: Data is missing or inaccurate for some reasons other than failure, Suppose example Autopilot(AP) shows NCD when AP switch turns off.

    One example for real time data:
    Data Source: ADR-1 (SDI-01)
    Signal Name: NCAS-1 (Binary (BNR) type)
    Lable: 206
    No of bits:14
    Range: -1023.9375 to +1024.0000
    LSB Position: 15
    MSB Position:28
    Resoultion/Accuracy: 0.0625
    Units: Knots
    In BNR data 29th bit being dedicate for sign
    0 for +, N,E,Right,Top
    1 for -,S,W,Left,Bottom.

    Example:
    32 Bit data pumped by ADR from MSB to LSB is “E13881C1”
    “1110 0001 0011 1000 1000 0001 1100 0001”
    sequence manner from 32nd bit to 1st bit.
    Parity – 32nd bit – 1
    SSM – 31st and 30th bit -11
    Sign – 29th bit – 0
    Data – 28th to 11th bits – 0 0001 0011 1000 1000 00
    SDI – 10th and 9th bit – 01
    Lable – 8th to 1st bit – 1100 0001

    Odd parity -1
    SSM – 11 (Normal operation)
    Data sign – 0 (Positive)
    Data is 19 Bits including data Data Sign bit: (0 0001 0011 1000 1000 00)
    But LSB is 15 and MSB is 28.
    So actual data is “0001 0011 1000 10” convert to Decimal is 1250
    Multiplied by Resolution/Accuracy- 0.0625
    Data is 1250*0.0625 = 78.125
    Label (LSB to MSB): 1100 0001 (label is transmitted in octal reverse manner here LSB to MSB)
    Label is 110-6
    000-0
    01-2
    Maximum possible Labels in A429 is 277(Octal Number).

    Thanks & Regards,
    K VAMSHI

    Reply
    1. admin

      Hi Vamshi,

      Thanks for sharing the information, I will add the details in the post. let everyone learn.
      Good job!!!!!!!

      Thanks,
      Sivparasad.

      Reply

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