Right, this RINO has a 4 pin serial port. I have read that other nicer models have a USB.
Okay, USB to Serial adapter. Before I spend more money, I decided to borrow one from a co-worker. It is a TrendNet TU-S9. I understand that this is not the same one you referenced, but the software seemed to install fine and it has created a "USB-Se...oller D" item in the System Preferences|Network window.
Now I need some advice to set up the serial connection. It looks like old phone modem settings because there are fields it wants me to fill in. Configuration, Telephone Number, Account Name, Password, a "Connect" button, an "Advanced" button. This also reminds me of setting up a HyperTerm/TeraTerm connection on a Windows computer, but I'm not familiar with the Mac settings.
Also, I noticed there are several "Interface" settings in the RINO. When I go to Main Menu|Setup|Interface, there is a setting called "Serial Data Format." Choices include Garmin, Garmin DGPS, NMEA In/NMEA Out, Text Out, RTCM In, RTCM In/NMEA Out, RTCM In/Text Out, and None. I have no clue what any of these mean