What is the difference between analog and digital sensors?

What is the difference between analog and digital sensors?

Analog Analog sensors connect through the analog inputs. These sensors are either a dry contact or provide a 0 to 5VDC signal. On the Web interface, they show up as "IO" sensors and have a value 0 to 99. Digital These connect to digital input ports and communicate though a serial protocol. Digital sensors are auto-detected by the climate monitor. Measurements from these devices are graphed and report in the appropriate units.