Exactly. If you use genuine motorola equipment you will have no problems.
Someone said that all these problems start with one sentence - "I bought a cable on ebay"
I am having nearly the same problem trying to take care of our CDM1550LS+'s. I have the ribless RKN4081 serial to 10 pin RJ cable from Motorola. Unfortunately, my laptop runs Windows 7 Home Premium 64 bit so I am having a devil of a time getting things to work. The computer does not have a serial port, just 3 USB's and a LAN port.
Everything appears normal right up to the moment that I try to read the radio when I get the dreaded "Can not read unknown radio component" error message.
The only USB to serial adapter I have at the moment is an inexpensive one that uses the Prolific chip set. The disc that they sent contains a bunch of drivers, but none of them seem to work. I even got the latest driver off the Prolific website and it doesn't help.
I installed the software on my wife's laptop that runs Vista. The computer won't load the adapter drivers, no matter what I try, but when I plug into the radio and try to read, it at least gives me the next step, the select port item, and then when I press OK, it just sits there and eventually gives me a check your cables error message.
Any thoughts? Any ideas about the serial to USB adapter? BTW, the Win 7 computer auto installs a generic driver when I connect it and checking through the Device Manager, it says it is OK.