On Wed, Jul 13, 2016 at 8:47 PM, Andrew Rich via aprssig <aprssig at tapr.org> wrote: > I have a Garmin GPS that does only TTL not true RS232 > > Would that still work ? > > Some manufacturers do that 0-VCC > > Andrew The levels aren't a problem but you'll need to wire an inverter into the cable. Tom KD7LXL