#include <unistd.h>

main()
{
unsigned char compCalCmd[6];
short z_mag = 425;

     compCalCmd[0] = 0x42;
     compCalCmd[1] = 0x71;
     compCalCmd[2] = 0x3e;
     compCalCmd[3] = 0x01;
     compCalCmd[4] = z_mag & 0xff00 > 8;
     compCalCmd[5] = z_mag & 0x00ff; 
     write(1,compCalCmd, 6);
}