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Detailed information about the pH/EC Interface can be found in the manual “FERTMASTER
pH/EC USER GUIDE 2007”.
5.6 THD Interface
The THD interface is meant to measure the ambient Temperature and Humidity, calculate
the actual Dew point and report the three values back to the controller. The values can then
be used for frost protection or conditioning of cooling programs. During the configuration
process when defining the hardware in use, the THD interface will be defined as an analog
interface of the type THD. Like any other interface it has an address switch that has to be set
according to what has been defined at the configuration process.
The scale range is automatically adjusted and need not be touched, however for obtaining the
values in American units JP14 on the THD board must be set in right position.
External interface
connection card
Temperature and
Humidity sensor
JP14 set to
European units
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