ADLINK Technology ND-6021, User Manual

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4-1 Data Format
4. Data Format
4. 1. Unit Conversion
The data value in the command of the analog output module is
corresponding to the amplitude of the physical analog signal. The
user should understand the data format to represent a analog signal
by an ASCII string. The physical meaning of a data depends on both
the unit conversion and the value. The unit conversion of the digits
value can be configured by the setting configuration command.
Three types of unit conversion are used in analog output modules.
1. Engineering units
2. Percent of FSR (Full Scale Range)
3. Hexdecimal
4. 2. Engineering Units
The date is in engineering unit when the bit 1 and 0 of the configuration
register are ‘00’. The data string is composited by
6 characters.
Because the output of ND-6021 is unipolar, the value is always
positive.
The meaning of the value depends on the output range setting too.
When the output range is set to 0~10V, the unit of the value is in
‘Volts’. When the output range is set to 0~20mA or 4~20mA, the
unit of the value is in ‘mA’.
•
Set bit 1 and bit 0 of data format variable to “00” means the data
is represented in engineering units.
•
Data string is fixed length of 6 characters. The value is
composed of five decimal digits with a decimal fixed point.
•
Two digits present the integer part and three present the
fraction.