Wiring to data logger

The sensor has an industry-standard M12 connector for attaching the cable. The wiring of the sensor is shown in Wire color, pin, function, and data logger connection.

Wire color, pin, function, and data logger connection
Pin	Wire color	Wire function	Data logger connection terminal
1	Brown	Power	12V
2	White	SDI-12	C terminal or U terminal configured for SDI-121
3, 42	Black	Power ground	G
	Clear	Shield	G
1C or U terminals are automatically configured by the SDI-12 measurement instruction. 2Both pin 3 and pin 4 are tied to ground, so either pin to ground works.

To use more than one sensor per data logger, either connect the different sensors to different terminals on the data logger or change the SDI-12 addresses of the sensors and wire them to the same terminal. Utilizing the SDI-12 address reduces the use of terminals on the data logger and allows sensors to be connected in a daisy-chain fashion that can minimize cable runs in some applications. (See Long cables for limits on the total cable length.)

For the CR6 and CR1000X, triggering conflicts may occur when a companion terminal is used for a triggering instruction, such as TimerInput(), PulseCount(), or WaitDigTrig(). For example, if the HygroVue 10 is connected to C3 on a CR1000X, C4 cannot be used in the TimerInput(), PulseCount(), or WaitDigTrig() instructions.

The SDI-12 address of the HygroVue 10 can be set two ways:

• By sending the required commands to the sensors via an SDI-12 recorder/data logger that allows talk through to the sensor.

• By loading a program into the recorder that sends the required commands.

See SDI-12 sensor support for detailed instructions.