linux rs485 通信代码
时间: 2023-08-23 14:05:44 浏览: 150
以下是一个使用 Linux 的 RS485 通信代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#define DEVICE "/dev/ttyUSB0"
#define BAUDRATE B9600
int main()
{
int fd;
struct termios options;
// 打开串口设备
fd = open(DEVICE, O_RDWR | O_NOCTTY);
if (fd < 0)
{
perror("open");
exit(-1);
}
// 配置串口参数
tcgetattr(fd, &options);
cfsetispeed(&options, BAUDRATE);
cfsetospeed(&options, BAUDRATE);
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
options.c_cflag &= ~CRTSCTS;
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
options.c_oflag &= ~OPOST;
options.c_cc[VMIN] = 1;
options.c_cc[VTIME] = 0;
tcsetattr(fd, TCSANOW, &options);
// 发送数据
char tx_buf[] = "Hello World!\n";
int len = strlen(tx_buf);
write(fd, tx_buf, len);
// 接收数据
char rx_buf[256];
int rx_len = read(fd, rx_buf, sizeof(rx_buf));
if (rx_len > 0)
{
rx_buf[rx_len] = '\0';
printf("Received: %s", rx_buf);
}
// 关闭串口设备
close(fd);
return 0;
}
```
注意,这只是一个简单的示例代码,并不能满足所有的 RS485 通信需求。在实际使用中,需要根据具体的应用场景进行相应的修改和调整。
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