ASYNC EXTGETBAUDRATE

This function returns the extended query bit rate in doublewords for a bit rate higher than 19200 bps.

Category

IOCTL_ASYNC (01h)

Function

ASYNC_EXTGETBAUDRATE (63h)

Parameter Packet Format

None. Packet pointer must be NULL.

Data Packet Format

Field	Length	C Datatype
Current Bit Rate	DWORD	ULONG
Fraction of Current Bit Rate	BYTE	UCHAR
Minimum Bit Rate Supported	DWORD	ULONG
Fraction of Minimum Bit Rate Supported	BYTE	UCHAR
Maximum Bit Rate Supported	DWORD	ULONG
Fraction of Maximum Bit Rate Supported	BYTE	UCHAR

Current Bit Rate

The binary integer representing the actual bit rate in bits-per-seconds set for a COM port.

Fraction of Current Bit Rate

The binary integer representing the fraction of the actual current bit rate set for a COM port.

Minimum Bit Rate Supported

The binary integer representing the minimum bit rate (in bits-per-second) port for a COM port.

Maximum Bit Rate Supported

The binary integer representing the maximum bit rate (in bits-per-second) supported for a COM port. Depending on overall system overhead and the electrical characteristics of the hardware cables and serial device adapter type, the actual value of the maximum bit rate supported might be lower than this.

Fraction of Maximum Bit Rate Supported

The binary integer representing the fraction of the maximum bit rate supported for a COM port.

Returns

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

Remarks

If a general failure error is not returned, the physical device driver returns the bit rate values as defined. This function is extended from the current "Function 61h - Query Bit Rate".