树莓派串口利用modbus通信

1、安装

sudo apt-get install libmodbus-dev

2、搭建modbus环境

https://blog.youkuaiyun.com/starelegant/article/details/72782946

3、编写测试程序

https://blog.youkuaiyun.com/qq_23670601/article/details/82155378#%E5%88%9D%E8%AF%95%E5%8C%96RTU%E7%8E%AF%E5%A2%83%E6%8C%87%E9%92%88%20modbus_t%20*modbus_new_rtu(const%20char%20*device%2C%20int%20baud%2C%20char%20parity%2C%20int%20data_bit%2C%20int%20stop_bit)

#include <stdio.h>
#include <stdlib.h>
#include <modbus/modbus.h>

int main()
{
  modbus_t *mb;
  uint16_t tab_reg[32]={0};
  mb=modbus_new_rtu("/dev/