Hi Bikash,

I'm not really sure the tolerance for baud rate. On the 8051 you can figure out what will work by how/when the uart samples data after a start bit, but I'm not sure what a PC's uart tolerance is. Does anyone out there know? It would be useful information to have.

I select my crystal so the baud rate error is 0. Your baud rate seems like it should be close enough. Certainly though a sign of mis-matched baud rates are characters that were not as expected.

For testing purposes you could eliminate the VB or C++ Builder programs and just use a simple PC terminal program (making sure your program is just sending ascii data, not binary...one thing at a time!).

Good luck,

Dennis