How to use UART for RSB-4710
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UART
The Android/Linux UART/serial port access is via the tty-devices. The tty-devices have different names depending on the UART driver on different boards.
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 transmit mode. Usually the UART RTS signal is used to switch the
transmitter on and off.
RSB-4710 UART
| Com Name | Device Node | Remark |
| COM1 | /dev/ttyS4 | Support RS-232,no flow control |
| COM2 | /dev/ttyS2 | Debug port |
| COM3 | /dev/ttyUSB0 | Support RS-232 |
| COM4 | /dev/ttyUSB1 | Support RS-232 |
| COM5 | /dev/ttyUSB2 | Support RS-232 and RS-485 |
| COM6 | /dev/ttyUSB3 | Support RS-232 and RS-485 |
How to Configure RS232/485 Mode
Enter U-boot interrupt mode.
Connect the device to the debug port and open the debug console.
Press “ctrl + c” before powering on the device. The following information should be displayed on the debug console: