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Thread: Yaesu FT-7900R: RS-232 to PS2 Data Cable Diagram

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  1. #1
    Join Date
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    Default Yaesu FT-7900R: RS-232 to PS2 Data Cable Diagram

    Does anyone have a diagram for the data/programming cables used with software to program these radios? Rather than order a pre-made USB to PS2 cable, I intend to make my own RS-232 to PS2 cable and use a USB to serial converter. I know some of these can act strangely, and I'm prepared for that.

    Thanks!

  2. #2
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    I know some of these can act strangely, and I'm prepared for that.
    Drivers that will work with the USB converter can be a problem. The Prolific drivers seem to be the best.
    Look here for TTL converter info;
    http://www.g4hfq.co.uk/links.html
    Last edited by K7MH; 05-12-2011 at 03:33 PM.
    "Oh what a tangled web we weave when first we practice to receive."
    -Otto Watt Sept. 5 1925

  3. #3
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    I found this:
    http://www.mods-ham.com/03_Home-brew...taCable-en.htm

    Going to give it a shot.

  4. #4
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    Quote Originally Posted by K7MH View Post
    Drivers that will work with the USB converter can be a problem. The Prolific drivers seem to be the best.
    Thank you, sir. I'll bear that in mind.

  5. #5

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    Be aware that "traditional" Serial Port (RS-232) signals are NOT directly compatible with USB Serial signals, at either the signal or circuitry level. There is NO simple cable that will allow the USB to connect to RS-232 or RS-232 to connect to USB without damage to either or BOTH devices.
    An interface from RS-232 to USB may or may NOT function as you wish; it WILL depend upon the software drivers that are designed for interface from the RS-232 to USB interface.

  6. #6
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    Thanks for the advice. I'm aware that USB and RS-232 are totally different entities. I wasn't about to plug in my radio direct
    The circuit I found is a level shifter based upon two transistors. I was a little worried about this design, since it draws it's power from the RTS/CTS lines, but it's clamped to 5V with a Zener diode, so I stayed late at work tonight and built it. It works like a charm, both with regular good old RS-232 (DB9) and a USB to serial converter (uses an FDTI USB to serial IC).

    Just thought I'd let you know!

    I bought and used the G4HFQ Radio Programming Software.

  7. #7
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    May 2011
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    Oklahoma
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    Thumbs up

    The cable... built on proto-board, using an old mouse cable.
    It's a bit rough (potted with epoxy and covered in heat-shrink tubing) but it works.

    Photo1.jpg

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