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→UART3/RS485 initialization
echo 114 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio114/direction
echo 1 > /sys/class/gpio/gpio114/value
echo 133 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio133/direction
echo 134 > /sys/class/gpio/export
</pre>
====UART3/RS232 initialization [2] ====
In order to use UART3 as RS232 interface, some GPIOs need to be configured as follows:
echo 114 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio114/direction
echo 1 > /sys/class/gpio/gpio114/value
==UART2 on mezzanine connector J53==
