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I have seen a number of programming cable schematics on the internet, but I couldn't understand very much how they worked. From what I picked from all schematics, it appears the protocol uses the CL_DATA pin for both RX and TX, and the CL_SW pin to signal stuff.

However, I couldn't really understand the protocol that the radio uses. Can someone please explain? What are both the radio and the computer interfaces sending and expecting in each pin?

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    $\begingroup$ Just FYI: don't use the programming tag for "radio programming" — it's for computer software. An unfortunate naming problem, I know. I'm thinking about how to improve it. $\endgroup$
    – Kevin Reid AG6YO
    Oct 9, 2016 at 13:49
  • $\begingroup$ @KevinReidAG6YO OK. How about splitting the tags into radio-programming and computer-programming? $\endgroup$ Oct 9, 2016 at 14:10
  • $\begingroup$ Yeah, that's a possibility. I just posted a meta question about this and some related lacks-of-tags, if you'd like to see more of the problem. $\endgroup$
    – Kevin Reid AG6YO
    Oct 9, 2016 at 14:15
  • $\begingroup$ If I understand correctly: Yaesu ./ Vertex professional have kind of UART interface (similar to RS-232, different voltage), and agree, TX&RX are connected $\endgroup$
    – Jacek Cz
    Oct 12, 2016 at 13:38
  • $\begingroup$ Software protocol is (as far I know) hidden (not known / proprietary) $\endgroup$
    – Jacek Cz
    Oct 12, 2016 at 13:41

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