FOSS in the Mobile World Serial console How to find the serial console Just run some code that you think writes to it Use a Scope to find typical patterns of a serial port I haven't actually done (or needed) this on the glofiish yet, but on many other devices RxD pin is harder to find, just trial+error usually works as soon as you have some interactive prompt that echo's the characters you write Don't forget to add level shifter from 3.3/5V to RS232 levels