I'd like to talk to anyone who has worked with the C-MAX CME800-BUS WWVB receiver board.
I have tried working with this part to the point of wanting to smash it with a mallet. I am trying to use it with a PIC 18F microprocessor and all I can get the thing to do is echo characters right back to the PIC.
If you connect the CME-8000 module directly to the PIC's serial port (assuming you take care of the voltage converter circuitry), you will only get loopback characters. I have another module from C-MAX that sits between the CME-8000 and my PIC, and this takes care of the weird one-wire serial interface that C- MAX seems to have implemented. I was trying to look for the part number on the C-MAX website, but I couldn't find it.
There is, however, a schematic for this circuit at the link below.
(Click on CME8000-BUS - RS232 converter -> download : the file is a pdf)
Another thing I noticed was that using their PC demo software (also available on the page I linked to) failed when using my laptop and a USB->Serial Port converter. I had to use a desktop computer with a "real" serial port to get the CME8000 to respond.