I am not sure what you're planning to do with "Serial" but when I'm using my 
K3/KIO3B withWSJT-X, I have the program configured for CAT Control on 
/dev/cu.usbserial-A5xxxxx at aBaud rate of 38400, 8 data bits, 1 stop bit, 
Handshake set to 'None', and PTT Method of RTS(set to the same 
/dev/cu.usbserial device), Mode Data/Pkt, Split 'Rig', and a 1 second Poll 
Interval.CONFIG:KIO3B is set to 'nor'.
Permissions for the port device file are set to 666 and owner/group is 
root/wheel.
You might also want to double-check About My Mac -> System Report -> Hardware 
-> USBto see if the K3 is showing up - mine is a 'General Purpose USB Hub' with 
a TI vendor IDwhich has a USB Audio Codec (Burr-Brown) and an FT232R USB UART 
whose serial numbermatches the device special file that WSJT-X is talking to.
Also, go to System Preferences -> Network and make sure that that port is not 
configured.(It most likely is not, but Murphy does very strange things at 
times!)
It wouldn't surprise me if Serial might have a permission problem/setting 
that's fouling you up,but that's just a SWAG on my part. I'm running Lady 
Heather through another USB line to myGPSDO without any fiddling on the macOS 
side, but you never know.
HTH and 73,
Brandy, N1HOMid-2017 5k 27" iMac, early-2015 13" Retina MBPro
    On Sunday, May 6, 2018, 2:48:28 PM EDT, Phil Hystad <[email protected]> 
wrote:  
 
 One of the very popular serial communications programs available in the Apple 
Mac store is an application called “Serial”.  What makes this app nice to use 
is that it includes built-in driver interfaces for just about any USB-Serial or 
serial interface you could put on a Mac computer.

I decided to connect to my K3 using Serial.  But, I am having trouble getting 
the K3 to respond.  I know I have the right comm port and I know that the K3 
can communicate over this comm port.  

Has anyone used Serial (the app from company Decisive Tactics, Inc.) to 
communicate with a K3 or any other Elecraft equipment?

73, phil, K7PEH

  
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