13
5.4.3. Chosen of values for analog outputs
The P18D transducer in versions P18D-1XX and P18D-2XX has two
programmable analog outputs (current or voltage). By default, the first
analog output is set to present the value of the ambient temperature and
the second analog output is controlled by relative humidity value. Analog
outputs can respond to each of the measured or calculated value (T, RH,
DP, AH). The steering value of the analog outputs define the registers
respectively 4015 for the first output and 4016 for the second analog
output (Table 12).
5.4.4. Individual Characteristic of Analog Outputs
The P18D transducer in version with analog outputs enables the con-
version of measured quantities into an output signal on the strength of
individual linear characteristic of analog outputs. On the base of given
coordinates of two points by the user, the transducer determines (from
the system of equations) coefficients a and b of the individual charac-
teristic.
Y1Out = a
·
X1In + b
Y2Out = a
·
X2In + b
{
where:
X1 In and X2 In - measured value
Y1 Out i Y2 Out - expected value on the analog output.
Summary of Contents for P18D
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