Are you turning your program into an .exe file first? If so, make sure that
this line is in your labview.ini file:
serialDevices="COM1;COM2;COM3;COM4;COM5;COM6;COM7;COM8;
COM9;\\.\COM10;\\.\COM11;\\.\COM12;\\.\COM13;LPT1;LPT2;"
And, of course, include the driver for serail communications (which is
included by default)
Otherwise, I'm not sure. I haven't done much serial communications. Make
sure you have flow control set up the way you want (Xon/Xoff...etc.)
Rick