the usbcom+ cable goes from the esc to the computer and allows for programming ease. to connect this cable to the esc i think you have to unplug the esc line out of the receiver and plug that into the usbcom+. the cc o2 cable plugs into a port on the esc and the usbcom+ plugs into that so that unplugging the esc from the receiver isn't necessary. make sense? thats how mike explained it to me.
The first one is to plug in your PC, it's an interface to speak with the controler, and the second connect the interface to the controler.
Without this two pieces, you can't program your controler with you PC, you have to do this with the Tx, and from what i've hear on this forum, seam to be painfull.
Soryry Tallyram, we've shoot our post in same time, but your's take the first place,
When i've start to repply to dadnjess, your post was not yet visible