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#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <strings.h>

#define SERIALPORT1 "/dev/ttyUSB0"
#define SERIALPORT2 "/dev/ttyUSB1"

int main(void)
{
    int fd, fd2, bytes, i;
    unsigned char a = 0xA1;
    char buf[255];

    // open the data channel
    fd = open(SERIALPORT1, O_RDWR  | O_NOCTTY | O_NDELAY);

    if (fd == -1) {
        printf("Error opening data channel!\n");
    } else {
        printf("Data channel open.\n");
    }

    // open the control channel
    fd2 = open(SERIALPORT2, O_RDWR | O_NOCTTY | O_NDELAY);

    if (fd2 == -1) {
        printf("Error opening control channel!\n");
    } else {
        printf("Control channel open.\n");
    }

    // flush I/O buffers on both serial devices
    tcflush(fd, TCIOFLUSH);
    tcflush(fd2, TCIOFLUSH);

    a = 0xA1; // get version info command code
    bytes = write(fd, &a, 1);

    if (bytes != 1) {
        printf("Error sending request: %d (%s)\n", bytes, strerror(errno));
    } else {
        // wait 200ms
        usleep(200000);

        // zero out the buffer
        bzero(buf, 255);

        // read the bytes
        for(i = 0; i < 255; i++) {
            bytes = read(fd, &buf[i], 1);

            if(bytes <= 0)
                break;
        }

        // output the version string
        printf("Version: %s\n", buf);
        printf("bytes read: %d\n", i);
    }

    // must clean up...
    close(fd);
    close(fd2);
}