RS485 Memo for ES2, ES3, ES4 (Not for MP version)

Half-Duplex RS-485 Flow Control

While using half-duplex RS485, the user has to manually implement the flow control.

• Disable hardware flow control if using minicom

• Config NRU-50 as sender or receiver with the following commands

# Config NRU-50 as Half-Duplex RS-485 Sender 
pin=428

sudo echo $pin > /sys/class/gpio/export
sudo echo out > /sys/class/gpio/gpio${pin}/direction
sudo echo 0 > /sys/class/gpio/gpio${pin}/value

# Config NRU-50 as Half-Duplex RS-485 Receiver
pin=428

sudo echo $pin > /sys/class/gpio/export
sudo echo out > /sys/class/gpio/gpio${pin}/direction
sudo echo 1 > /sys/class/gpio/gpio${pin}/value