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Thread: Yaesu FT-857D Custom CAT Control Questions

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  1. #1
    Join Date
    Feb 2008
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    Buda, Texas, USA
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    Default Yaesu FT-857D Custom CAT Control Questions

    Hi all,

    I'm about to interface my microcontroller project with my Yaesu 857D, and it's not clear to me if the CAT data signal is TTL or RS-232. Also, would I command it over the RX D or the TX D line?

    Thanks!
    Ross NN5RR

  2. #2
    Join Date
    May 2001
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    Roswell, NM DM73
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    Default

    If you go to Yaesu's web site, you can download the CAT manual replete with everything you need to know.
    Alan Applegate, KBG
    http://www.k0bg.com

  3. #3

    Post

    The RS-232 Standard requires:
    http://en.wikipedia.org/wiki/RS-232
    http://en.wikipedia.org/wiki/Serial_port

    Voltages between +5 and +15 volts for logical 0, and
    Voltages between -5 and -15 volts for logical 1.

    The Yaesu CAT Interface is a TTL standard compliant (between 0 and +5 Volts).
    Zero (0) volts for logical 0,
    +5 volts for logicial 1.

    Maxim/Dallas MAX-232 series of Level Converters is a common IC used for CAT interfaces.
    http://www.om3rkp.cq.sk/articles.php?lng=en&pg=12

    Yaesu FT-897 connector wiring
    http://homepage.ntlworld.com/rg4wpw/ft897info.html

    ---
    w9gb
    Last edited by W9GB; 06-08-2011 at 12:06 AM.
    Nullius in verba

  4. #4
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    Default

    Alan, I can't seem to find a CAT manual on the website. Do you have a URL? That would be most helpful, thanks! :-)

    Ross NN5RR

  5. #5
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    FT-450_CAT_Operation_Reference_Book.pdf

    This is the CAT info on the 450. Except for the port pinout, and a couple of minor commands, the info is the same for all Yaesu transceivers with a CAT port.

    The back of the manual on each respective transceiver, has the command set for that model.
    Alan Applegate, KBG
    http://www.k0bg.com

  6. #6
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    Feb 2008
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    Buda, Texas, USA
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    Yeah, that doesn't do me much good, b/c that's a DB9 connector that's set up for standard RS232 communication. I have the mini-DIN that I think can be commanded with a TTL output.

    I know the packet contents and the timing that I need. I just need to verify that TTL levels will work, and if I indeed command it on the Rx D pin (instead of the Tx D...I'm not sure whether the tx/rx reference point is the radio or the CAT peripheral).

    Other than the command pin on the mini-DIN and if TTL, I'm good-to-go with coding up everything! :-)

    Thanks,
    Ross NN5RR

  7. #7
    Join Date
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    Default

    No offense, but if you can't figure out the cable and the signal levels, you might want to buy a pre-built USB cat cable and stick with just doing the programming. Goofing around with trying to convert RS-232 level signals to TTL can lead to damaging the radio if you don't know what you're doing.

    You should be able to find a current manual on Yaesu's website, and as others have mentioned, the CAT commands and protocol are typically listed towards the back of the manual.

  8. #8

    Post

    I just need to verify that TTL levels will work
    You have that answer .. Did you understand the answer?

    The Yaesu CAT Interface is TTL Standard Compliant (between 0 and +5 Volts).

    Zero (0) volts for logical 0; +5 volts for logical 1.
    Nullius in verba

  9. #9
    Join Date
    Feb 2008
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    Buda, Texas, USA
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    Default

    None taken! I'm not trying to "figure out the cable". There's no "the" in my cable. I have buffered Arduino GPIO data (TTL), and I'm wondering which *pin* of the CAT connector is the data in (Rx D or Tx D, it's all about who's the reference) and if indeed it has DC voltage sense.

    That's it. I have my own cut up 8-pin mini-DINs and wires and cables to make what I need.

    I can't find the reference on the Yaesu site or Google, btw.

    Thanks, all!
    Ross NN5RR

  10. #10
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    Oh, I missed that line, sorry, and thanks!

    Ross NN5RR

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