Yes,Erel,thanks your reply,Send the pulse continues on DTR&RTS on serial port for software reset when the Aduino IDE opened,then deploy the firmware used the avrdude program on same serial port,last print the debug message to the same serial port used the java program in directory lib,Now the B4R ide can select the serial port between the IDE or B4J serial connector,the software reset pulse is uses Arduino IDE command or send by B4R IDE? because the software reset electrocircuit only a 103pf cap is very not stable,i want to try set more delay time to resolve the problem.But the preferences.txt have no delay item,and I had set the avrdude.conf param,also failed,I guess the software pulse delay time should be set by IDE.