6ES5535-3LB12

6ES5535-3LB12

6ES5535-3LB12

6ES5535-3LB12

6ES5535-3LB12

b). Colibri Eva Board X25 DB9连接器默认为UART2接口RS232电平输出，可以连接到Ubuntu开发主机进行UART2串口测试。另外，通过载板跳线测试也可以将UART3串口路由到X25 bottom DB9连接器上面，具体说明可以参考这里。

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c). Colibri iMX6 UART除了RS232模式，也支持RS422/485模式，这里还是利用UART2来测试RS485半双工模式通讯，基于Colibri Eva Board的硬件连接如下：

./ 将Colibri Eva Board连接器X2 bottom DB9 管脚4（RXD+），管脚5（RXD-）以及管脚1（GND）和PC主机485接口设备对接

./ 将Colibri Eva Board下面几个跳线做如下设置：

  JP11 短接 – 让485接口可以发送以及接收收据，如果断开，则只能发送数据

  JP12，JP14断开 – 用于插入120ohm终端电阻，针对RS-422模式

  JP13，JP15短接 – 设置为半双工模式，如果断开，则为全双工模式

  JP16短接 – UART2到RS232的功能关闭，切换到RS485功能；断开则反之。

4). RS485功能使能方法

a).在device tree中使能，。

//参考这里下载Toradex Linuxkernel V2.6版本源代码，根据如下patch文件修改arch/arm/boot/dts/imx6dl-colibri-eval-v3.dts文件，并参考这里编译新的dtb文件后部署到Colibri iMX6模块上。

这种使能后在应用程序就不需要针对485做使能处理了。

b). 利用ioctrlTIOCSRS485在应用程序中使能，具体代码可以参考下面实例。

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