Could you please be more specific what is your entire set-up, what is your target, what steps you did, what you expected as outcome and what happened instead?
`I'm using nRF52 dev board using the debug out pin I'm connecting it to another devboard of the same kind but with an additional chip supporting serial communication. I want to setup a serial communication b/w the computer and the secondary dev board using terminal emulator. So which example code should I use for this purpose and also what changes are to be incorporated in it.
OK, if you have some "serial to USB" chip/cable connected to the PC and nRF52 chip then you probably can use any SDK example FW which has UART debug output enabled. If your target board isn't identical to PCA10040 (nRF52 DK) PIN layout for UART Tx (or other PINs if you use them) then you need to create custom HW header file and recompile the project.
