View source for RSB-3730 UART（RS-232/RS-485）


=== '''How to Config RS232 or RS485 Mode''' ===

{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| '''COM Name'''
| '''Device Node'''
| '''Remark'''
|-
| UIO2 com1
| /dev/ttymxc0
| support RS232
|-
| COM1/DEBUG2
| /dev/ttymxc1
| Debug Port
|-
| COM
| /dev/ttymxc2
| support RS232/RS485
|-
| UIO2 com4
| /dev/ttymxc3
| support RS232
|}

Enter U-boot interrupt mode&nbsp; Connect device to debug port, and open debug console.<br/> Press "ctrl + c" key before power up the device, until get the following information on&nbsp;debug console:
<pre>Hit any key to stop autoboot: 0
=> <INTERRUPT>
=></pre>

Then you can input the following cammand to config UART mode.

'''RS485 Mode：'''
<pre>=> setenv uart_mode 2:1
=> saveenv
=> reset</pre>

RS232 Mode：
<pre>=> setenv uart_mode 2:0
=> saveenv
=> reset</pre>

Note：The default value is RS232.

The above command "setenv uart_mode 2:1", 2:1 means to set ttymxc2 to RS485&nbsp;standard mode, and 2:0 means to set ttymxc2 to RS232 mode.<br/> The following RS232 testing method is shared by "/dev/ttymxc0, /dev/ttymxc2, /dev/&nbsp;ttymxc3",and only needs to be replaced Uart Name.

'''RS232- Loopback Test'''
<pre># stty -F /dev/ttymxc0 -echo -onlcr 115200
# cat /dev/ttymxc0 &
# echo "Serial Port Test" > /dev/ttymxc0</pre>

[[File:RSB-3730 RS232 loopback Test.png]]

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