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Sniffing Seaeye telemetry

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Viewing 5 posts - 1 through 5 (of 5 total)
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  • December 10, 2010 at 4:28 pm #3985
    rov_er
    Participant

    Hi everybody,

    maybe someone already tried this before and can give me some advice.

    I would like to get a readable Seaeye telemetry string from the 485/232 converter to a Telnet client (e.g. HyperTerminal).
    What I currently get is a string that is not in ASCII format and I can not read it…is that a binary format?

    If not, any idea on how to decode it?

    Cheers,
    rov_er

    PS: I know that with the Seaeye Sniffer + SW I can monitor the telemetry, but that’s not my point

    December 10, 2010 at 5:03 pm #29887
    Etienne Demers
    Participant

    Telemetry comms are binary words typically consisting of start bits address bits, data bits, checksum etc.

    It would be ridiculous to design it any other way as it would take too many bits for an instruction.

    I understand where you come from. Most accessories fitted to ROVs have data output strings. But this is quite different.

    Even if you could isolate each words and get the format from SeaEye you wouldn’t know what to do with it. (No offense, but asking such a question gives out your level of knowledge) Even if you did, finding what you would be after would be like finding a needle in a million haystacks.

    What exactly are you after?

    The only alternative would be a test software simulating the bottom end which SeaEye has but will likely not share. If its for troubleshooting I guaranty you do not need to got that far.

    Hope this helps

    December 10, 2010 at 8:26 pm #29888
    rov_er
    Participant

    Hi Chewy,

    thank you for your reply.
    You are right, my level of knowledge for telemetry comms is not high and I am trying to get an insight and clarify my mind.

    The reason for such a question is that we are mainly doing a laboratory exercise.

    The point is: if I manage to decode the telemetry string to/from subsea, then in principle I could

    1) develop a sw that acquires and displays ROV parameters
    2) develop a sw that allows to control the ROV via a simple keyboard, for example

    You confirmed my doubts that what I am getting is binary words with Seaeye format, thus no possibility of decoding unless they don’t tell you the format.

    Well, if that is the case, I think this is the end of our exercise…

    Cheers,

    rov_er

    December 11, 2010 at 5:10 pm #29889
    Manuel Parente
    Participant

    Hello rov_er,

    I’m recently created a startup company immerse Systems.

    We have developed a Navigation and Telemetry system for the Seaeye Falcon ROV, fully sea tested.

    Take a look at http://www.immerse.eu/?page_id=70.

    Contact me if you are interested, it’s not an expensive software but very useful.

    Manuel Parente

    November 3, 2011 at 5:25 pm #29890
    rov_er
    Participant

    Even if you could isolate each words and get the format from SeaEye you wouldn’t know what to do with it. (No offense, but asking such a question gives out your level of knowledge) Even if you did, finding what you would be after would be like finding a needle in a million haystacks.

    Well, my laboratory exercises have been postponed for quite a long time, but I finally managed to work on it and decode the seaeye telemetry.
    It is time consuming (a few days) but not extremely complicated as it seemed.

    Now I’m just curious to see how far we can go with our experiments…

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