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Homebrew Kenwood TS-850 CAT Cable

Discussion in 'Homebrew and Kit Projects' started by VE3TMT, Nov 20, 2018.

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  1. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    Will give it a try, I have another board the controls PTT, CW keying and RTTY keying, so no worries there.

  2. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    So I tried disconnecting the CTS and RTS, no change. I've reversed the wires, inverted signal lines. Nothing changes.

    I did read since the Kenwood uses hardware handshaking, the CTS and RTS lines come into play. You can just loop them (connect RTS to CTS at the radio side, and also connect RTS to CTS at the computer side. The circuit will then work fine with just the RxD and TxD signals.

    Is this possible, haven't tried jumpering the RTS and CTS on the radio side.
  3. KA9JLM

    KA9JLM Ham Member QRZ Page

    For loop back testing that would work. But if the radio uses those lines I don't think it will help you.

    Try it and see. I would hook a 1 k resistor between them so pull up and pull down works.
    VE3TMT likes this.
  4. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    No change :(
  5. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    It appears the radio is receiving commands from the computer, but the computer is not receiving commands from the radio.
  6. LW6DGR

    LW6DGR Ham Member QRZ Page

    Lo pudiste resolver? Yo estoy comenzando y estoy buscando informacion. Saludos.
  7. W9GB

    W9GB Ham Member QRZ Page

    This Q&A topic (DIY Build USB cable for Kenwood radio) is now 4 years old.

    Go back to Reply #13 (November 23, 2018) in this thread, will give you
    DIY Build Basics for older Kenwood radios, since early 1980s (TS-440S)
    using the radio’s 6-pin DIN (marked on rear panel as Remote or ACC).

    ONLY the RxD and TxD data lines require Inversion,
    since Kenwood used Inverted Serial protocol at 5 Volt levels (UART/TTL).
    Pin Assignments for ACC1 (DIN-6) on rear panel of Kenwood radios

    DIN Connector Key is UP, at the 12 o'clock position (attached pictorial),
    Pin Assignment (numbering)

    Pin 1 is at Two o'clock position; numbering proceeds clockwise
    Pin 5 is at Ten o'clock;
    Pin 6 is at Center.
    Last edited: Nov 25, 2021
  8. W9GB

    W9GB Ham Member QRZ Page

    TESTING an Unknown FTDI USD Cable (Good or Bad)

    , Limor Fried, AC2SN (founder of AdaFruit) posted, over a year ago,
    an Easy Method to Test your FTDI USB Bridge cable (typically using FT232R chip)

    Setup for Work bench Testing of FTDI USB Serial Cable

    1.) FTDI USB cable being tested.
    2.) 100 ohm resistor, 1/4 watt suitable
    3.) Windows OS Computer with USB port : Used for FTDI Chip Test
    4.) Digital Volt Meter (DVM) : Used for Voltage Test
    5.) X-CTU software : Used for Serial Test (RX, TX, CTS, RTS)

    428CF342-1E3F-4F8B-B2FF-82805834F547.jpeg 41B7863F-20C1-4C6A-9DCA-1B9D11EA7CB3.jpeg
    DIY Build USB Cable for Kenwood Transceiver (6-pin DIN, Round, Rear Panel)
    This is for CAT, Remote Control of Kenwood Transceivers (1980 to mid-1990s).

    NOT for Digital Modes (FT8, etc.) which requires a Digital Signal Processor (DSP),
    found in Computer Audio/Sound Cards, External DSP modem, etc.

    Here are the DIY Build Steps, from a year ago (repeated from 2014).
    Last edited: Nov 28, 2021
  9. KA9JLM

    KA9JLM Ham Member QRZ Page

    I would not use Windows 10 for this test. It can set the "Magic" bit and make the adapter useless.

    Win 10 will flag the .EXE first, Then can kill the adapter as a unsupported chip set.

    Contrary to popular belief, Windows 7 should still be safe to use. :)

    Please do correct me if I am wrong. I am just going by experience.

    A unsigned .EXE may not fly. Even Win 7 does not like it. I sure do not want to test it. A 34 meg .exe has more going on than a FTDI adapter test. o_O
    Last edited: Nov 28, 2021
  10. W9GB

    W9GB Ham Member QRZ Page

    X-CTU is a Serial Terminal program written by DIGI International (Hopkins, MN).
    The program (40002637_c.exe) supplied by Limor Fried, AC2SN is from DIGI FTP servers.

    DIGI started in 1985. I knew the company when I was installing MS Xenix systems in Iowa.
    I also used serial card products from LAVA in Canada (their main competitor).

    The EXE file is ~25 MB in size, and is a self extracting Windows installer program.
    This is an older version of X-CTU : version (May 14, 2008)
    I have installed on my Windows 10 computer (latest 21H2 November update).
    IF you would like to recommend another Serial Terminal program with Ease of Use
    and performs ALL of the Appropriate tests … Please Provide a Recommendation (you use).
    Last edited: Nov 28, 2021

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