8. UART Usage¶
8.1. Description¶
AIO-3576JD4 use UART3 for RS485, which is /dev/ttyS3 in system. And UART8 for RS232, which is /dev/ttyS8 in system.
And GPIO3_A3 is used for direction control of RS485, pull it up will change RS485 to send mode, pull it down will change RS485 to receive mode.
Users can use /sys/class/gpio subsystem to control this GPIO.
Interfaces: