Computer driver problem or voltage problem ?

[sfchew7]

Computer driver problem or voltage problem ?
I have programmed the right code to my pic16f877a, I can use putc/printf function but I failed to use getch function.
I couldn't receive any data from pc to my PIC16f877a when using my own computer but when I used my friend's computer, it can transmit the data from his PC to my PIC16f877a.
I have using max 232 IC, rs232 db9 femal pin, and also usb to rs232 converter.
The circuits and the coding are the same.
So, what will be the problems?
thanks

 

[devil6600]

try shorting Rx and Tx pin of your computers DB9 port and sending some data? this will check if the fault is in your computers DB9 port.

 

[sfchew7]

try shorting Rx and Tx pin of your computers DB9 port and sending some data? this will check if the fault is in your computers DB9 port.

mean I connect my db9 pin and usb to serial port converter to my laptop only? and using hyper terminal or real term to do the loop back test?
is it I don't need to connect my db9 pins to PIC ,if I short pin2 n pin3? thanks

 

[milind.a.kulkarni]

I will say if you are sending the number as characters from serial port like char c= 1; and putchar(c); then try to send the ASCII value of character so send like putchar(c+48);
and simillarly for alphabatical characters too...I mean ASCII value....may be your problem will get solved.....I was saying do this modification in code that you are burning in the PIC