UART Usage

Description

AIO-3576C use "UART3" for "RS485", which is "/dev/ttyS3" in system.
And "UART8" for "RS232", which is "/dev/ttyS8" in system.

Interfaces:



RS485 Usage

   # set transceiver control pin, high level transmit, low level receive
   sudo echo 22 > /sys/class/gpio/export
   sudo echo out > /sys/class/gpio/gpio24/direction
   # close echo
   sudo stty -F /dev/ttyS3 -echo
   # transmit
   sudo echo 1 > /sys/class/gpio/gpio22/value
   sudo echo "firefly uart test..." > /dev/ttyS3
   # receive
   sudo echo 0 > /sys/class/gpio/gpio22/value
   sudo cat /dev/ttyS3