PC to Rasberry Pi Serial Communication
You have used the wrong type of level converter for a PC serial port.

RS232 to logic level requires a bipolar inverting converter.  Bipolar in the sense that it uses both positive and negative voltages in the 12 to 15 volt range.

Your pictures shows a unipolar non-inverting device intended for inter-logic connections such as I2C.

To adapt the pi to RS232, get a module based on something like a max3232.

Or just get an ft232 or cp2102 based USB to 3.3v serial converter.