Serial Communication with PIC16F877A

[mcbeasleyjr]

Make sure the cable is not for a modem. Pin 2 on one end goes to Pin 2 on the other, the same for pin 3.

Test PC serial port by jumping PINs 2 and 3 with a 10K and use a terminal to see if you get an echo.

I tested my serial port and sent 5 succesfully in the loopback... what else can i try?