Measurement-computing Data Acquisition Systems rev.10.4 Instrukcja Użytkownika Pobierz pdf (Strona 263)

100

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Programmer’s Manual 908794 Daq API Command Reference 4.5-33

Example of Calculating “whichDevice” for three DBK20 P2 Exp 8255-1 Port C banks.

For the first positioned card n= 0.

Thus for the first card’s P2 Exp 8255-1 Port C ….

whichDevice: (Note 1)

(nx8) + Diodp8255B + 4 =

n = 0

Result:

Diodp8255B + 4

For the second positioned card n= 1.

Thus for the second card’s P2 Exp 8255-1 Port C ….

(nx8) + Diodp8255B + 4 =

n = 1

Diodp8255B + 12

For the third positioned card n= 2.

Thus for the third card’s P2 Exp 8255-1 Port C ….

(nx8) + Diodp8255B + 4 =

n = 2

Diodp8255B + 20

Note 1: The equation is from the whichDevice column and “P2 Exp 8255-1” row (shaded), in the preceding table.

Prototypes

C/C++

daqIOReadBit(DaqHandleT handle, DaqIODeviceType devType, DaqIODevicePort

devPort, DWORD whichDevice, DaqIOExpansionPort whichExpPort, DWORD bitNum,

PBOOL bitValue);

Visual BASIC

VBdaqIOReadBit&(ByVal handle&, ByVal devType&, ByVal devPort&, ByVal

whichDevice&, ByVal whichExpPort&, ByVal bitNum&, bitValue&)

Program References

DAQEX.FRM (VB)

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