the configuration is
1 change serial port config on minicom.
serial device : /dev/ttyUSB0 --note:cause we don't have any serial port on computer,we use USB to Serial device for connection device.
BPS/par/Bits: 115200 8N1
hardware control: NO
others use default.
then enter minicom. you'll receive welcome note:)
2 we found some problems with unsolicited and unreadable words on screen irregularly.
after google from internet, I found that maybe the USB2Serial device have interference(for to wireline of the device is too long) cause the problem. change another one fix the problem.