I was makin a burnner using serial communication through Comm port, the problem that when i use the S/W that communicate with port a small change in the voltage level is detected on the port while i've used a serial comm. program written in C++ that write direct to the port and it works perfect but cause a large difference in the port voltage level when i write a cgaracter on the Keyboard, i've tried to use Hyper Terminal but when i began writting on keyboard nothing occured for the signal level, please I need also one to tell me how to use It write because I think I may use it wrong,also it there a difference between the program in C++ that write direct to port and the Hyper Terminal, Thanks a lot
Regardes
Ahmed Barakat