3. Setup
24
ADI16-4(USB)
Sampling
Input Range and Conversion Data
On ADI16-4(USB), the range of input can be selected from ±10V ⋅ 0 – 20 mA by using software.
The analog signals are converted into digital signals with a 16-bit resolution based on the range setting.
Current Input
As for this module, 0 – 20 mA is
converted.
The right figure shows the relation
between converted data and voltage
value within the range of 0 – 20 mA.
Because the converted data is based on
the value of dividing 20 mA current
width(current span) by 65536, the
converted data increase every 1, the
current value increase 0.305µ A.
The converted data will be FFFEh for a
current its converted data exceed
FFFFh.
Current value = (Current span of input range) / 65536 x (converted data)
= 20 / 65536 x (
converted
data
)
Bipolar range
Indicates that the range of voltage
measurable is bi-polar range, for this
module, it is
±10
V.
The right figure shows the relation
between converted data and voltage
value within the range of
±10
V.
Because the converted data is based on
the value of dividing 20V voltage
width(voltage span) by 65536, the
converted data increase every 1, the
voltage value increase 0.306mV.
The converted data will be FFFEh for a
voltage its converted data exceed
FFFFh.
Voltage value = (Voltage span of input range) / 65536 x (converted data) + offset voltage
= 20 / 65536 x (converted data) - 10
Offset voltage : -10V for range of ±10V.
(Decimal) (Hexadecimal)
20mA
65535 FFFFh
19.999 69 mA
65535 FFFFh
19.999 69 mA
65534 FFFFh
19.999 39 mA
65533 FFFDh
19.999 08 mA
: :
32769 8001h
10.000 31 mA
32768 8000h
10.000 00 mA
32767 7FFFh
9.999 69 mA
: :
2 002h
0.000 61 mA
1 001h
0.000 31 mA
0mA
0 000h
0.000 00 mA
Decimal Hexadecimal
10V
65535 FFFFh
9.999 69 V
65535 FFFFh
9.999 69 V
65534 FFFEh
9.999 39 V
65533 FFFDh
9.999 08 V
: :
32769 8001h
0.000 31 V
32768 8000h
0.000 00 V
32767 7FFFh
-0.000 31 V
: :
2 002h
-9.999 39 V
1 001h
-9.999 69 V
-10V
0 000h
-10.000 00 V
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