In a nutshell:
Install the driver.
Connect the UIC.
Open the device manager from the System Properties in the Control Panel.
Look under the PORTS heading and see what COM port # Windows assigned it. Open the properties of that com port and local at the advanced page on the port settings tab. Change the latency timer to 1. (You can also change the com port assignment to something else if you like too).
Save and close the control panel.
Open RSLinx. Add a new device from the RS232 DF1 selection. In the configuration dialog that pops up, assign the COM port to what you found previously, change the device to a 1770-KF3/1747-KE. Set the baud setting to what you need, error checking to CRC, protocol to Full Duplex. AUTO CONFIG does not work with the UIC.
If everything went clean you should see devices connected to it. Anytime you change the baud rate, I've found that I've had to close RSLinx, disconnect the UIC, wait, connect again, then start RSLinx. Apparently the UIC configuration is only when its first connected. Of course this may work differently on your computer.
Hope this helps.