- 3How to config RS232 or RS485 mode
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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 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.
|COM Name||Device Node||Remark|
|COM0|| /dev/ttyS0|| pull to M2 interface for BT using|
| COM1|| /dev/ttyS4|| support RS232, no flow control|
| COM2|| /dev/ttyS2|| Debug Port|
| COM3|| /dev/ttyUSB0|| support RS232|
|COM4|| /dev/ttyUSB1|| support RS232|
| COM5||/dev/ttyUSB2||support RS232 and RS485|
| COM6|| /dev/ttyUSB3|| support RS232 and RS485|
1. Only COM4、USB2COM0、USB2COM1、USB2COM2、USB2COM3 are designed for custom using.
2. Only USB2COM2 and USB2COM3 support RSB485.
3. COM2 is designed as debug port default.
Enter U-boot interrupt mode
Connect device to debug port, and open debug console. See more : How_to_debug.
Press 'ctrl + c' key before power up the device, until get the following information on debug console :
Then you can input the following cammand to config UART mode.
Config Uart Mode
Only ttyUSB2 and ttyUSB3 support RS485 mode.
The default value is RS232.
Cp210x support four port, but RSB4710 Only ttyUSB2 and ttyUSB3 support RS485 mode.
Drivers Raytek Rsb Port Devices Download
Above command 'setenv uart_mode 0x0c', 0x0c means set bit2(ttyUSB2) and bit3(ttyUSB3) to 1 (0 means to RS232; 1 means to RS485).
If you just want ttyUSB2 (or ttyUSB3)to be RSB485 mode, please change 0x0c to 0x04 (or 0x08).