## Physical Device Driver Reference

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### ASYNC_SETBREAKON (4Bh) - COM Error Word (COMERR)

COM Error Word (COMERR) The physical device driver returns this information if a general failure error is not reported. See ASYNC_GETCOMMERROR for COMERR definition. The COM device error information is not cleared by this action.

If, after processing this Close request, the port will not be open (from another Open without a Close), a CLOSE request packet causes break to be turned off.