Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to use UART for rk"
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Enable the RS-485 feature by either using ioctrl ''TIOCSRS485'' from user space as described in [https://github.com/ADVANTECH-Corp/linux-imx6/blob/imx_4.1.15_1.0.0_ga/Documentation/serial/serial-rs485.txt <font color="#0066cc">RS-485 Kernel Documentation</font>]. | Enable the RS-485 feature by either using ioctrl ''TIOCSRS485'' from user space as described in [https://github.com/ADVANTECH-Corp/linux-imx6/blob/imx_4.1.15_1.0.0_ga/Documentation/serial/serial-rs485.txt <font color="#0066cc">RS-485 Kernel Documentation</font>]. | ||
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Revision as of 04:24, 16 November 2017
Contents
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 |
|
|
