Campbell Scientific SR50-L CSC Ultrasonic Distance Sensor - Manual (Page 17)

SR50 Sonic Ranging Sensor
11
3.3.1 Pulse Training Wiring
FIGURE 3. Pulse Train Wiring
The order in which the connections are made is critical.
Always connect ground first, followed by +12V and then
the remaining SDI-12/Data Bus, Sensor Enable Line and
Shield. In disconnecting the sensor the reverse order
should be followed. CAUTION
Datalogger
Color Function Connection
Black Ground
Ground (G)
Red +12V +12V
Green Data Bus Pulse Channel
White Sensor Enable Control Port
Clear Shield Ground (G)