Difference between revisions of "ASYNC SETBREAKOFF (45h)"

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(Created page with "This function sets the break off. ; Category:IOCTL_ASYNC (01h) ; Function:ASYNC_SETBREAKOFF (45h) ==Parameter Packet Format== None. Packet pointer must be NULL. ==Data Pa...")
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Revision as of 21:41, 26 March 2020

This function sets the break off.

Category
IOCTL_ASYNC (01h)
Function
ASYNC_SETBREAKOFF (45h)

Parameter Packet Format

None. Packet pointer must be NULL.

Data Packet Format

┌───────────────────────────────────────────────────┐
│Field                       Length     C Datatype  │
├───────────────────────────────────────────────────┤
│COM Error WORD (COMERR)     WORD       USHORT      │
└───────────────────────────────────────────────────┘

Returns

If the call is made with an invalid Parameter Packet pointer and a general failure error is reported, this function is not performed and valid information is not returned in the Data Packet.

Remarks

If a general failure is not returned, then the physical device driver stops generating a break signal. It is not considered an error if the physical device driver is not generating a break signal. The physical device driver then resumes transmitting characters, taking into account all the other reasons why characters might be transmitted.