RDM6300

Pins and voltage

RDM6300 can be powered from NanoPI +5V pin. However, it does not require voltage adapters for signals, as the signals are 3.3V (in and out).

You can connect pins 4 (VCC 5V), 6 (GND), 8 (UART1 TX) and 10 (UART1 RX) to the corresponding pins in the board (of course, TX to RX and vice versa).

Check, using npi-config, that UART1 is enabled (npi-config -> Advanced options -> Serial -> serial1).

Download and compile comtest

git clone https://github.com/friendlyarm/comtest.git
cd comtest
gcc -o comtest comtest.c

then test it

./comtest -d /dev/ttyS1 -s 9600