Power output

The data logger can be used as a power source for communications devices, sensors and peripherals. Take precautions to prevent damage to these external devices due to over- or under-voltage conditions, and to minimize errors. Additionally, exceeding current limits causes voltage output to become unstable. Voltage should stabilize once current is again reduced to within stated limits. The following are available:

12V: unregulated nominal 12 VDC Volts direct current.. This supply closely tracks the primary data logger supply voltage; so, it may rise above or drop below the power requirement of the sensor or peripheral. Precautions should be taken to minimize the error associated with measurement of underpowered sensors.
SW12: program-controlled, switched 12 VDC Volts direct current. terminals. It is often used to power devices such as sensors that require 12 VDC during measurement. Voltage on a SW12 terminal will change with data logger supply voltage. CRBasic Campbell Scientific's BASIC-like programming language that supports analog and digital measurements, data processing and analysis routines, hardware control, and many communications protocols. instruction SW12() controls the SW12 terminal. See the CRBasic Editor help for detailed instruction information and program examples: https://help.campbellsci.com/crbasic/cr6/ .
CS I/O port: used to communicate with and often supply power to Campbell Scientific peripheral devices.

CAUTION:

Voltage levels at the 12V and switched SW12 terminals, and pin 8 on the CS I/O port, are tied closely to the voltage levels of the main power supply. Therefore, if the power received at the POWER IN 12V and G terminals is 16 VDC, the 12V and SW12 terminals and pin 8 on the CS I/O port will supply 16 VDC to a connected peripheral. The connected peripheral or sensor may be damaged if it is not designed for that voltage level.

C or U terminals: can be set low or high as output terminals . With limited drive capacity, digital output terminals are normally used to operate external relay-driver circuits. Drive current varies between terminals. See also Digital input/output specifications.
U terminals: can be configured to provide regulated ±2500 mV dc excitation.