iniesta

In this VI ( please take a look at the attached file ) i do a loop back test with the COM1 port, if i reduce the delay-before-read time to less than 15 ms ( this value can be different in your computer i think ), the program can not work properly any more. delay >= 15ms delay < 15 ms So what is the problem here ? Can i do something to solve this problem ? Thanks in advanced !