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Arin429 question-Please help

Hi all, I did'nt know where to ask this question.Since Arinc429 protocol will be used in avionics I am asking here,If this is not the right group please let me know where to ask. I am totally confused over the function of bits 30 and 31(SSM bits).Can any body explain with examples why these bits are used?

Thanks in advance, Ashwath

Reply to
prashna
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They are the Sign & Status Bits and sometimes include bit 29 also. They tell you how to interpret the payload data like if its north or south, positive or negative, valid or invalid. How you use the SSM depends on what

429 message you're dealing with.

Go to

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and you can download the GAMA addendum to arinc 429 for free. See section 3.2 for examples of the SSM bits. However its not a substitute for getting the real Arinc 429 spec which can be purchased from
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I hope you're not designing stuff that's actually going in an airplane.

Reply to
Steve

Thanks steve for your answer, But I could'nt find the link to download the GAMMA addendum in

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u please give the complete url where it is available?

No, I am not a designer, but I am testing avionics software.Just wanted to know about this protocol.

Reply to
prashna

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