Configured on a Mac mini (Mid 2011) running El Capitan, 10.11.5.
Note: The output audio will default to the headphone jack at random. Read about the problem with USB audio codecs and Mac audio here.
On the Mac:
On the TS-590SG:
3. Make sure a dummy load is present on the antenna connector, power on the TS-590SG and set the power output to 5 watts.
4. Press the Menu key.
5. Use the “MULTI/CH” selector and go to number 68, “USB PORT BAUDRATE”.
6. Use the UP/DOWN buttons and select 57600.
7. Use the “MULTI/CH” selector and go to number 69, “AUDIO INPUT LINE SELECTION FOR DATA COMMUNICATIONS”.
8. Use the UP/DOWN buttons and select “USB”.
9. Use the “MULTI/CH” selector and go to number 70, “SOURCE OF SEND/PTT TRANSMISSION”.
10. Use the UP/DOWN buttons and select “REAR”.
11. Use the “MULTI/CH” selector and go to number 76, “VOX OPERATION WITH DATA INPUT”.
12. Use the UP/DOWN buttons and select “ON”.
13. Press the MENU key to save and exit.
14. Turn off the TS-590SG.
15. Connect the USB cable to the rear USB connector on the TS-590SG.
16. Turn on the TS-590SG.
Go back to the Mac:
17. Open System Preferences.
18. Click on Sound.
19. Click on the Input tab. You should see “USB Audio CODEC”. Select the device. You should see the bars move with sound input.
20. Click on the Sound Effects tab. Using the "Play sound effects through" drop down menu, DO NOT choose "USB Audio CODEC". Click on the Output tab. You should see “USB Audio CODEC”. Select the device.
21. Close System Preferences.
22. Download and install Fldigi.
23. Open Fldigi. You will see the Fldigi configuration wizard. Click “Next”.
24. Enter your station information. Click ”Next”.
25. On the Device tab, check the PortAudio box. Select “USB Audio CODEC for both Capture and Playback. Click “Next”.
26. Click on the Hamlib tab.
27. From the “Rig” drop down menu, select “Kenwood TS-590S (Beta)”.
28. From the “Device” drop down menu, select “/dev/cu.SLAB_USBtoUART”.
29. From the “Baud rate” drop down menu, select “57600”.
30. Make sure Stopbits is 1 and Sideband is “Rig mode”.
31. Make sure the “Use Hamlib” box is checked.
32. The letters on the “Initialize” button at the lower right will be red. Click on it. The red letters will turn to black and the frequency display behind the Wizard will reflect the rig’s current dial frequency. Click on “Next”.
33. Update the frequencies using your choice of data source. Click “Finish”.
34. Click on the Configure menu in the main window and Save Config.
35. Read the instructions for Fldigi and connect to your antenna.
That’s it! :-)
Note: A Mac Mini will generate S3 RF noise regardless if you are connected to the USB port through a SignaLink, or through the DB-9 connector, depending on the band.