c++ modbusrtu写多个线圈寄存器示例

以下是使用C++编写的Modbus RTU协议写多个线圈寄存器的示例代码：

#include <iostream>
#include <modbus/modbus.h>

int main() {
    modbus_t* ctx = modbus_new_rtu("/dev/ttyUSB0", 9600, 'N', 8, 1);
    if (ctx == NULL) {
        std::cerr << "Failed to create modbus context" << std::endl;
        return 1;
    }

    // Connect to Modbus device
    if (modbus_connect(ctx) == -1) {
        std::cerr << "Failed to connect" << std::endl;
        modbus_free(ctx);
        return 1;
    }

    // Set the slave address of the device
    modbus_set_slave(ctx, 1);

    // Set the start address of the coils
    const int addr = 100;

    // Set the number of coils to write
    const int count = 8;

    // Create a buffer to store the coil states
    uint8_t coils[count];

    // Set the states of the coils
    for (int i = 0; i < count; i++) {
        coils[i] = (i % 2 == 0) ? 1 : 0;
    }

    // Write the coil states to the device
    int rc = modbus_write_bits(ctx, addr, count, coils);
    if (rc == -1) {
        std::cerr << "Failed to write coils: " << modbus_strerror(errno) << std::endl;
        modbus_close(ctx);
        modbus_free(ctx);
        return 1;
    }

    // Close the connection to the device
    modbus_close(ctx);

    // Free the memory used by the modbus context
    modbus_free(ctx);

    return 0;
}

请注意，这只是一个示例代码，你需要将其适配你的设备和线圈寄存器的地址。同时，你还需要确保设备支持Modbus RTU协议，并且你已经正确地配置了串口通信参数。