## Physical Device Driver Reference

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### ASYNC_SETBREAKON (4Bh) - Remarks

If a general failure error is not returned, the physical device driver generates the break signal immediately. It is not considered an error if the physical device driver is already generating a break signal. The device driver does not wait for the transmit hardware to become empty. Note that more data is not given to the transmit hardware until the break is turned off. The break signal is always transmitted, regardless of whether or not the physical device driver is transmitting characters for other reasons.