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:

Continuous 12 V: BAT + and – provide a connection to the unregulated, nominal 12 VDC battery. It may rise above or drop below the power requirement of the sensor or peripheral.
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 (SW1, SW2) 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/cr350/ .

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 , SE 1-4, and P_SW terminals: can be set low or high as output terminals (SE 1-4 and P_SW to 3.3 V, and C to 5 V). With limited drive capacity, digital output terminals are normally used to operate external relay-driver circuits. Drive current and high-state voltage levels vary between terminals. See also Digital input/output specifications.