Yokogawa PC-Based MX100 - Manual (Page 279)

5-21
IM MX190-01E
Functions for the MX100 (Visual C/Visual Basic)
5
getFIFODataNoMX
Syntax
int getFIFODataNoMX(DAQMX daqmx, int fifoNo, MXDataNo *
startDataNo, MXDataNo * endDataNo);
Declaration
Public Declare Function getFIFODataNoMX Lib "DAQMX"(ByVal
daqmx As Long, ByVal fifoNo As Long, ByRef startDataNo As
MXDataNo, ByRef endDataNo As MXDataNo) As Long
Parameters
daqmx Specify the device descriptor.
fifoNo Specify the FIFO number.
startDataNo Specify the destination where the start data number is to be
returned.
endDataNo Specify the destination where the end data number is to be
returned.
Description
Gets the range of measured data that can be retrieved at the specified FIFO
number.
The start data number is set to the next number following the data number that was
retrieved last.
• The start data number is set to the next number following the data number that
was retrieved last.
• If the measured data that must be retieved does not exist, the negative of each
data number is returned.
Example:
If data numbers from 10 to 49 exist on the main unit and the last retrieved data
number was 29, a start data number of 30 and an end data number of 49 is
returned.
If the last retrieved data number was 49, the negative of each data number is
returned, and the function ends normally.
• For the validity check of the returned data, see the isDataNoMX function.
Return value
Returns an error number.
Error:
Not descriptor
No device descriptor.
Reference
CDAQMX::getFIFODataNo
5.1 Details of Functions - MX100 (Visual C/Visual Basic) -