I know that this question pops up now and again, but can someone please refresh my memory on what an arduino can and can’t talk to directly on the serial and serial 2,3 & 4 ports?
I’m looking at a couple of GPS modules LS20031 & LS20032 (http://www.sparkfun.com/datasheets/GPS/Modules/LS20030~3_datasheet_v1.0.pdf). The LS20031 uses TTL voltage levels, I think this mean it can be plugged directly to an arduino port, is this correct? The LS20032 uses RS232 and therefore needs to go through a MAX232 level converter (or something similar). Is this correct?