As you can understand from title, this article is short manual about assembling of device which allows to make connection between your uart device and a PC by COM port.
I’ve assembled my converter at the simplest schematic: two wires from RS-232 port and two wires to uC – it is enough for my needs. Here is beautiful picture with this schematic (I got it from http://sodoityourself.com/max232-serial-level-converter/):
I’ve made PCB in Altium Designer:
There is small bug at this pcb: I had footprint only for male connector and when I tried to remake it, I made a mistake – right signals not on 2, 3, 5 pins, but on 1, 3, 4.
Here is 3d version of PCB, just fir fun 🙂
Now, time for a test. Just shorts TX and RX and type and terminal any symbol: if device works properly, you see this symbol at terminal immediately, like that: