CHAPTER 3
SDI-12 Sensor Connections
17
SDI-12 Sensor Connections
Sensor powered by RTU
To connect a single SDI-12 sensor, that does not have it’s own
power supply, follow the wiring scheme as shown in Figure 11.
Figure 11. Single Sensor Connection, sensor is powered by the RTU
Note: In this configuration, the RTU powers the SDI-12 sensor. The
sensor must be capable of working with a supply voltage as
low as 5.6V.
WARNING
Check the minimum supply voltage of your sensor
BEFORE
installing it! This information should be available from
your sensor supplier.
Self powered Sensor
Sensors with an integrated power supply must be connected fol-
lowing the wiring scheme in Figure 12.
Jumper
Detection
SDI−DATA
SDI−GND
POWER
SDI−12 SENSOR
1
2
SDI−DATA
SDI−GND
3
4
5
SDI−Sense
SDI−POWER
GND
gray
yellow
green
