2021-06-18, 11:57 PM
hello it is dangerous for the rpi to receive nmea 0183 whith r232 converter to ttl (3,3V) directly on uart 0 PL011 i have ten converter and not usb r232 (i am at anchorage ) good idea or bad thanks for your help 
2021-06-19, 05:49 PM
with 3.3 volt output ithis is not dangerous at all, but be absolutely shure to have the same ground and no power inbetween before connecting to the pi. First measure then connect the pi pins.
2021-06-19, 07:46 PM
(2021-06-19, 05:49 PM)holgerw Wrote: [ -> ]with 3.3 volt output ithis is not dangerous at all, but be absolutely shure to have the same ground and no power inbetween before connecting to the pi. First measure then connect the pi pins.
thanks i think in the boat all thing have the same ground one baterry for the instrument i connect old furuno gp 32 directly to converter whith rs232 signal and the power of converter it the pi the ground it the same thanks for your interest
the shematic