There are two software packages that come with the LC-1: LM Programmer for setting things up, and Logworks3 for datalogging AFR and Lambda information. These programs require a PC and a USB to Serial cable. A serial to LC-1 cable is provided in the LC-1 kit. The LC-1 software, windows and the LC-1 don't always hook up. After wrestling with it for a year I was motivated to find a sequence that always connected. Here it is for reference. To Begin 1. Motorcycle off. 2. No Open programs (Logworks, LM Programmer) 3. Connect serial cable to LC-1 and USB cable to PC. 4. Turn on key and power up LC-1s 5. Start a program (e.g. LM Programmer) and use its connect sequence. When finished 1. Close Program in Windows 2. Turn Off motorcycle, power down LC-1 Then to start another progam, go back to To Begin. This worked a half dozen times on my single LC-1 A simple way of saying this is that the LC-1 must be powered down between program changes.