iSMA-B-MINI/MIX BACnet User Manual
www.ismacontrolli.com
DMP261en | 1st Issue rev. 8 | 05/2022
page 29 of 114
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resistance and temperature measurement (10k thermistor, a full list of supported
temperature sensors is available here: List of Supported Temperature Sensors);
dry contact (output current 1 mA).
Current measurement is realized by voltage measurement and 200
Ω
resistance.
According to
Ohm’s
law, the current is directly proportional to the voltage, and the
resistance is the constant of proportionality. (I = U / R). According to the
Ohm’s
law
equation, for 20 mA current with 200
Ω
resistance the output voltage is 4 V. It means that
the 4 V voltage measured on the universal input corresponds to 20 mA current. The
result is expressed in millivolts.
5.2.1 Universal Input Voltage Connection
Figure 28. A universal input voltage connection
5.2.2 Universal Input Current Connection
Figure 29. A universal input current connection
