Contec DAI16-4(USB), User Manual

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3. Setup
DAI16-4(USB)
23
3.9. Sampling
3.9.1. Output Range and Conversion Data
On DAI16-4(USB), the range of output can be selected from both
±1
0V and
0
– 20mA by using
software.
The analog signals are converted into digital signals with a 16-bit resolution based on the range
setting.
Current output
As for a module, 0-20mA is contrasted.
The right figure shows the relation
between converted data and current
value within the range of 0 – 20mA.
Because the converted data is based on
the value of dividing 20mA current
value width(current span) by 6553, the
converted data increase every 1, the
current value increase 0.305mA.
Current value
= (
current span of output 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.
Voltage value = (Voltage span of output range) / 65536 x (converted data) + offset voltage
= 20 / 65536 x (converted data) - 10
Offset voltage : -10V for range of
±10
V.
(Decima) (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
(Decima) (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