close(fd);returnres; }/*Set enable/disable to configure*///Enable rs485 moders485conf.flags |=SER_RS485_ENABLED;/*set logical level for RTS pin equal to 0 when sending:*/rs485conf.flags&= ~(SER_RS485_RTS_ON_SEND);/*Set logical level for RTS pin equal to 1 after sending:*/rs...
DI为接收器的输入引脚,和MCU的TX引脚连 DE Driver Output Enable 驱动器的输出使能 RE(加杠) Receiver Output Enable 接收器使能 我们只需要一个GPIO引脚来控制 ,这个GPIO引脚我们经常叫它DIR。 当DIR=0时,接收电路使能RE¯=0(上加横杠,代表低电平有效),发送电路禁止DE=0,对于总线而言相当于高阻,发不了消息...
case 'N': newtio.c_cflag &= ~PARENB; /* Clear parity enable */ newtio.c_iflag &= ~INPCK; /* Enable parity checking */ break; case 'o': case 'O': newtio.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/ newtio.c_iflag |= INPCK; /* Disnable parity checking */ break...
Both serial ports 5 and 6 can be enabled as RS-485. Choose one of these serial ports inF81866 Super IO Configuration, shown in Figure 3, and pressEnter. Figure 3. F81866 Super IO Configuration Enable the serial port, if not already enabled, which will se...
对于RS485通信,除了上述常规的UART配置之外,还需额外控制DE(Driver Enable)或RE(Receiver Enable)引脚,以切换RS485收发器的工作模式。在发送数据时,使能DE引脚以便驱动总线;在接收数据时,关闭DE引脚并开启RE引脚。这部分控制通常通过GPIO进行操作,并非直接在HAL库的UART接口函数内完成。
* @enable: 0 on disable, other on enable * * The function return 0 if success, others if fail. */ int libtty_rs485set(int fd, char enable) { struct serial_rs485 rs485conf; if (enable) rs485conf.flags |= SER_RS485_ENABLED; ...
I want to interface RS485 transceiver with AM335x processor. I am using UART5 for this purpose. I have doubt regarding transmit Direction Enable (DE) signal connection
/* Enable RS485 mode: */rs485conf.flags |= SER_RS485_ENABLED; //设置使能485/* Set logical level for RTS pin equal to 1 when sending: */rs485conf.flags |= SER_RS485_RTS_ON_SEND; //设置rts,当逻辑电平为高的时候,为发送//rs485conf.flags |= SER_RS485_RTS_AFTER_SEND;...
要将配置好的项目下载到Smart 1000 IE设备上,首先要保证HMI设备的通信口处于激活状态,可通过HMI设备的“Control Panel”>“Transfer”进行设置,如图9所示。如果选择串口方式下载项目,首先需要勾选“Serial”右侧的“Enable Channel”。 图9. 通信口使能 其次,要使用...