IoTGateway/BSP/Android/Gettingstarted/How to use UART for rk

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Overview

The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UART driver on different board.

RS-485

RS-485 uses half-duplex communication, which means that one medium is shared for transmitting and receiving data. Therefore the system needs to control the RS-485 transceiver's transmit mode. Usually the UART RTS signal is used to switch the transmitter on and off. Our modules provide the following support:

Enable the RS-485 feature by either using ioctrl TIOCSRS485 from user space as described in RS-485 Kernel Documentation.

 

Boards

RSB4680 Borad

COM Name Device

RS485 support

COM1
 /dev/ttyS2
COM2
 /dev/ttyS4
 Yes
COM3

COM4

COM5

COM6







 

ROM3420 COM.png

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