minicom with konsole UTF-8

I tried the minicom with zh_TW.UTF-8 environment.
but I found a strange problem there,

I was set configuration for minicom , “38400 8N1” Software Control : OFF , Hardware Control: OFF ,This setting is correctly, but I don’t get any message for console,
I checked my USB-Serial Driver and System, but still get nothing.
if I turned Hardware Control “ON”, It will show some message with “unreadable” string.

At last, I changed konsole’s encoding to big5, all problem are solved .

minicom cannot connection with my embedded system with Konsole ‘s utf-8 environment.
POOOOOOR.