Do tego cacka podłącz MAXa 232 albo przez dwa tranzystorki i zadziała .
https://www.google.pl/search?q=UV5r&source=lnms&tbm=isch&sa=X&ei=FZpeUay2OtD44QS4woDYAg&ved=0CAcQ_AUoAQ&biw=1280&bih=685#imgrc=HYsQDPvikkBlJM%3A%3Bh0VVINWPOP8-FM%3Bhttp%253A%252F%252Fwww.rudolf.net.pl%252Fsp9kat%252Fwp-content%252Fuploads%252Fstuff%252Ftrx%252Fbaofeng%252Fuv5r%252Fschematic%252Fuv-5r-interface.jpg%3Bhttp%253A%252F%252Fwww.rudolf.net.pl%252Fsp9kat%252F%253Fpage_id%253D132%3B942%3B802
https://www.google.pl/search?q=UV5r&source=lnms&tbm=isch&sa=X&ei=FZpeUay2OtD44QS4woDYAg&ved=0CAcQ_AUoAQ&biw=1280&bih=685#imgrc=HYsQDPvikkBlJM%3A%3Bh0VVINWPOP8-FM%3Bhttp%253A%252F%252Fwww.rudolf.net.pl%252Fsp9kat%252Fwp-content%252Fuploads%252Fstuff%252Ftrx%252Fbaofeng%252Fuv5r%252Fschematic%252Fuv-5r-interface.jpg%3Bhttp%253A%252F%252Fwww.rudolf.net.pl%252Fsp9kat%252F%253Fpage_id%253D132%3B942%3B802
Piotrek - SP5MG