PSP integraton with an Arduino

Since my current arduino project needs wifi, I was thinking that since a psp has a serial port on it, I could wire it up to my arduino and through code, I could have a pc send commands through wifi over to the psp that relays the command over to the arduino. It sounds complicated but it should work. I am currently researching on how the psp's serial port works, but I need some help connecting it to an arduino. I have found and but I am still unsure about how to connect it, after it's connected, I think I know how to write up the arduino and psp code.