Want to use nRF51822 as wireless connectivity chip (UART) to an external MCU using a UART 4 wire electrical interface.

[gburke]

Are there examples of routines that support communication with the external UART interface?

[John]

Yes, if you download the SDK there are UART examples. Also this forum has many articles regarding using the UART.

[Guilherme de Paula]

I think you want to use the NUS example in the SDK. This basically turns the nRF51822 into a UART <=> BLE data pipe.