When Hosting the IF2C with a DL0102G/XN, the communications options include the standard DLITE Family comms options, except for a modification to the USB-Serial connectivity.
Tested USB Demo R&D Option
With the IF2C/G/XN stack, you have the option, for R&D purposes and ease of swapping testing rigs, measuring current, etc., to power from a battery or 4.1VDC supply (see Power Options) while using USB-Serial communications in the way that USB-Serial is often used. In this case, safely and carefully omit connecting the USB-Serial adapter’s 5VDC pin. Connect only the USB-Serial (1) ground, (2) Tx, and (3) Rx.
Then, using either (1) the break out +5VDC terminal on the IF2C to bring 5VDC to the Host G/XN or (2) by connecting the VSYSIN solder jumper on the IF2C, you power the Host and system. (See Power Options)
USB (or Other) 5VDC Option
You can however, as it turns out, power the stack (untested, charge component implications not yet known, but may be fine) without a battery or 4.1VDC supply with that USB-Serial +5VDC connection. Apply that 5VDC to the Host +VDC input as usual and then use either the wire or the solder jumper to bring power to the IF2C, as noted above. (See Power Options)
NOTE: Just do not connect this 5VDC to the charge or battery inputs on the IF2C.