Ray,

The cable is a 3 wire, not a 4 wire.
Yes, the shield is connected to pin 1 at the K2 end, but the shield should not connect to anything at the KUSB to serial adapter end. The shield is used as a Faraday Shield by connecting to ground at only one end.

Is that possibly your problem.

Make sure the N1MM+ baud rate is set to 4800 baud and not its default.

You might try connecting with something more simplistic than N1MM+. Try a terminal application running on the PC and see if the commands listed in the KIO2 manual produce good results.

73,
Don W3FPR

On 7/28/2019 4:43 PM, Ray S via Elecraft wrote:
Hi Don
Yes, I guess I was expecting to be able to assign the COM port in the K2. However I 
followed your suggestion & the laptop assigned COM3 to the USB/RS232 adaptor & 
confirmed that the driver is OK & the device is working.
But when I connect the K2 to the 4 wire cable, open N1MM+ & enter COM3 in the 
N1MM Config/Hardware tab it doesn’t recognize the K2 frequency etc. Maybe I’d 
better check the cable before anything else.
73 Ray G3XLG
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