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PRT-ATH1 / ACC-ATH1 Protege Temperature and Humidity Sensor Installation Manual | April 2011
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9.3 Variable Setup
To view the temperature and humidity information in the Protege System Management Suite, the information
stored in the registers must be linked to variables in the Protege System Management Suite. To set up a variable
to correctly display and log the temperature or humidity information, perform the following steps:
Variable Properties Window – General Tab
Step 1
Open the new variable by selecting Controller‘ -> Variables -> Add’.
Step 2
Enter a name for the variable in the Name field.
Step 3
In the Register field, enter the required register number as explained in the Register Locations section (see
page 20).
Step 4
Scale the values. The number which is sent from the module is (Celsius Temperature x 100) + 4000, or Relative
Humidity x 100. This means that the number 0 corresponds to -40˚.C,0 and the number 6500 corresponds to
25.0˚C. This number must be scaled and offset to display temperature correctly.
Refer to the table below for the
correct settings for the desired output.
Output Scale Factor (N) Scale Factor (D) Offset Decimal Point
Temperature (Celsius) 1 1 Minus 4000 2
Temperature (Fahrenheit) 9 5 Minus 4000 2
Relative Humidity (Percent) 1 1 Plus 0 2