public link unit digital0 {} = driver.digital0;
public link unit digital1 {} = driver.digital1;
public link void OS_init(){} = driver.OS_init;
public link void Open1(){} = driver.open1;
public link void Close1(){} = driver.close1;
public link void Swap1(){} = driver.swap1;
public link void Open2(){} = driver.open2;
public link void Close2(){} = driver.close2;
public link void Swap2(){} = driver.swap2;
