When you are setting up a new Raspberry Pi, it’s helpful to have console access so that it can saves you from having the separate keyboard and monitor.So i am using this serial cable 3.3V. Inside the usb plug there is an USB to Serial conversion chip is there. Using this serial connection to connect to a Raspbery Pi has many advantages.The boot process is at 115,200 bit/s) and also we can able to see the kernel boot messages.Since most of the Desktop and laptops does not comes with serial port at that time can go with this cheapest solutions.
For placing an order:
** Serial cable 3.3V : http://tenettech.com/product/2625/usb-serial-cable-f