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In the previous tutorial we saw how to measure voltage and current. Often, there is a sensor which has voltage or current output and we need to measure that voltage and convert it back to real engineering units. Let's take a look at one simple example - an air mass flow sensor. This sensor has a 4÷20 mA current output, a 0÷5 V voltage output and also a RS232 interface.
All three interfaces are connected. The blue and black wire is voltage output, and it goes to the DAQP-V-A module. The 9 pin voltage modules have have the added benefit of also providing voltage for charging the sensors. If the sensors don't exceed current consumption specs, they can be charged directly from the module. The red and black wire is the current output and it goes to the second DAQP-V, but in the front, we can see a shunt resistor. The thick gray cable is the RS232 connector, which goes to the RS232 port. In DEWESoft, the plug-in is written to read that data.
