Keyspan USA-19 - Manual (Page 24)

Once you are in the System Preferences window, click on the Network icon and proceed to Step
3.
Step 3 - Configure the Network System Preference to use the Keyspan serial port
When you first open the Network System Preference window, you may be told that a 'new port has
been detected.' This message is normal and is letting you know that the Network System
Preference has found a new connection. In this case, the new port/connection is the Keyspan serial
port. If you see this message, simply click the OK button.
Once you are in the Network System Preference window, select the Keyspan serial port (this is the
name of the port from Step 1) from the Show menu as shown below:
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Keyspan:USB Serial Adapter for Mac OS X-v2.x User Manual
This User Manual applies to the Keyspan USB Serial Adapter Software for Mac OS X.
Rev 05jul15 Page 24