Richard,

If you want to have the software application know the band and frequency that the K3S is working, you must establish communications between that application and the K3S. With the K3S, that is accomplished over the USB connection between the computer and the K3S.
So you must tell the application which COM port the K3S is connected to.

Yes, a USB port will have a COM port associated with it. I do not know how to find that information on a Mac, so perhaps some other Mac user will be able to tell you.

The K3S uses the USB cable, and not an RS-232 cable - unless you have some strange connection using the RJ45 to RS-232 dongle on the K3S instead of the USB cable.

73,
Don W3FPR

On 8/23/2018 6:01 PM, Richard wrote:
K3S, Mac Sierra 10.12, WSJT-X version 1.8.0.

Everything is working perfectly. Well, 99.874% is working perfectly. The little 
WSJT-X dropdown menu for band selection doesn’t follow band changes I make at 
the K3S. I am told this can be facilitated with “a cable” between the K3S and 
the Mac: RS-232 connector at the K3S and USB-A at the Mac.?

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