I have added an LCD to see what is going on. I have verified that the bluetooh module is receiving correctly, also the Lbyte and Hbyte I'm sending to the FT639 are correct. For some reason the data is not going to the FT639 correctly. I have tried all four possible 2400 baud rates, 396, 16780, 33164, and 49548. The serial_in works perfect, The serial_out command is the problem.