If when you plug an USB cable in, and no COM port appears, and the CPS has no communication from the radio, it's an DOA cable right? I am planning on getting another one and was wondering, which is best: USB with FDTI chip, or old fashioned Serial one? Both my XTS5000R's are FPP enabled and I successfully added a few freqs to both of them that way, but want to go further into the settings and load them up. I have ASTRO 25 CPS, and am very familiar with programming radios, so just want to make sure I get the best set up to proceed with. TYIA!