sim 800

Hi there,
I want to connect a 'SIM800L GPRS GSM Module' to Nano Pi Fire.
I would be so glad if guide me to how I would do that.

for communication you nedd 3 wire 

sim 800        nanopi
RX ---------->  tx
TX ---------->  rx
GND---------->  GNd 

use 4 volt power for sim 800 

other thing is software that you must use serial port command