ASY_RTS_DTR_OFF
asy->asy_flags |= ASY_RTS_DTR_OFF; /* OFF */
if (asy->asy_flags & (ASY_IGNORE_CD|ASY_RTS_DTR_OFF)) {
asy->asy_flags & ASY_RTS_DTR_OFF);
async->async_flags &= (ASYNC_DTR_DELAY|ASY_RTS_DTR_OFF);