Ken,

Actually, since you have the P3 in place too, there are 5 possible points of failure instead of 3. To what I mentioned before, add the P3 RS-232 'thru' path, and the RS-232 cable between the P3 and the K3.

Eliminate the P3 and the P3 to K3 cable by connecting the RS-232 cable directly to the K3.

73,
Don W3FPR

----------------------------------------------------------
Ken,

Since the K3 is "doing its thing" normally, try another USB to serial adapter, or another computer. There are 3 possible things that could be at fault - the computer, the USB to serial adapter, or the K3 RS-232 interface.
Do what you can to reduce the possible points of failure down to one.

73,
Don W3FPR

On 3/29/2015 9:30 AM, K M Dailey wrote:
Hi Ross,

Yup, tried that - powered the K3 off, waited 30 secs, powered on and held the 
Power button down until the red TX light comes on and MCU LD appears - still no 
comms to the iMac.



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