It was available on eBay as Olimex USB-SERIAL-CABLE Olinuxino console cable alternative to Raspberry Pi. I decided to buy Olimex USB To Serial Cable.
The documentation about RPi peripherals says that at reset only pins GPIO 14 & 15 (TxD, RxD) are assigned to the alternate function UART. Along with other questions I wanted to try talking to RPi via a serial cable. I recently started playing to Raspberry Pi.
