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.
5V: regulated 5 VDC Volts direct current.. The 5 VDC supply is regulated to within a few millivolts of 5 VDC as long as the main power supply for the data logger does not drop below the minimum supply voltage. It is intended to power sensors or devices requiring a 5 VDC power supply. It is not intended as an excitation source for bridge measurements. Current output is shared with the CS I/O port; so, the total current must be within the current limit. See 5 V fixed output specifications.
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/cr1000x/ .
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.

VX terminals: supply precise output voltage used by analog sensors to generate high resolution and accurate signals. In this case, these terminals are regularly used with resistive-bridge measurements (see Resistance measurements for more information). Using the SWVX() instruction, VX terminals can also supply a selectable, switched, regulated 3.3 or 5 VDC power source to power digital sensors and toggle control lines.
C 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. See also Digital input/output specifications.