Contec AD12-16(PCI), User Manual

Page: 47 / 76

Functions and Operating Procedures
AD12-64(PCI), AD12-16(PCI)
40
Reference
Sample software : AI1.C, AI2.C, AI3.C, AI4.C, AII.C, AII98.C
Feeding conversion data
Before feeding conversion data, verify that the conversion data is
contained in a given register. Conversion data can be fed from the
register even during conversion operation.
The figure on the right shows the
procedures for inputting conversion data.
The conversion data is in offset binary
format and the following equation
represents the relation between conversion
data and input voltage:
Figure 4.4.
Input conversion
data
Table 4.2. Example conversion data in a ±10
–volt range conversion
Input voltage 12-bit conversion data
(±10V range) Offset binary
+9.995V 0FFF h
: :
0.005V 0801 h
0.000V 0800 h
-0.005V 07FF h
: :
-10.000V 0000 h
Verify
Input data
Verify DRE status
Start
Analog input status
End
Data = (V Offset) x 2
12
Span
Input range Offset Span Input range Offset Span
-10V to +10V 10 20 0V to +10V 0 10
-5V to +5V 5 10 0V to +5V 0 5
-2.5V to +2.5V 2.5 5 0V to +2.5V 0 2.5
-1.25V to +1.25V 1.25 2.5 0V to +1.25V 0 1.25