Difference between revisions of "IoTGateway/BSP/Android/Gettingstarted/How to use UART for rk"
From ESS-WIKI
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== <span style="font-size: medium"><font color="#0066cc">RS-485</font></span> == | == <span style="font-size: medium"><font color="#0066cc">RS-485</font></span> == | ||
| − | 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 | + | 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. |
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= '''<span style="font-size: large"><span style="color: rgb(0, 0, 205)">Boards</span></span>''' = | = '''<span style="font-size: large"><span style="color: rgb(0, 0, 205)">Boards</span></span>''' = | ||
Revision as of 04:25, 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.
Boards
RSB4680 Borad
| COM Name | Device |
RS485 support |
|---|---|---|
| COM1 |
/dev/ttyS2 |
|
| COM2 |
/dev/ttyS4 |
Yes |
| COM3 |
|
|
| COM4 |
|
|
| COM5 |
|
|
| COM6 |
|
|
