Campbell CR1000X - Table 2-6: Digital I;O Terminal Functions (Continued); 2.1 Power Input

Table 2-6: Digital I/O terminal functions
C1-C8
Timer Input
ü
Interrupt
ü
2.1 Power input
The datalogger requires a power supply. It can receive power from a variety of sources, operate
for several months on non-rechargeable batteries, and supply power to many sensors and
devices. The datalogger operates with external power connected to the green POWER IN port on
the face of the wiring panel Wiring panel and terminal functions (p. 5). The positive power wire
connects to 12V. The negative wire connects to G. The power terminals are internally protected
against polarity reversal and high voltage transients. If the voltage on the POWERIN terminals
exceeds 19 V, power is shut off to certain parts of the datalogger to prevent damaging connected
sensors or peripherals.
The primary power source, which is often a transformer, power converter, or solar panel, connects
to the charging regulator, as does a nominal 12 Vdc sealed rechargeable battery. A third
connection connects the charging regulator to the 12V and G terminals of the POWER IN port.
UPS is often the best power source for long-term installations. If external alkaline power is used,
the alkaline battery pack is connected directly to the POWER IN port. External UPS consists of a
primary-power source, a charging regulator external to the datalogger, and an external battery.
WARNING:
Sustained input voltages in excess of those listed in the Power requirements (p. 163), can
damage the transient voltage suppression.
Ensure that power supply components match the specifications of the device to which they are
connected. When connecting power, switch off the power supply, insert the connector, then turn
the power supply on. Troubleshooting power supplies (p. 120)
The CR1000X can receive power via the POWERIN port as well as 5 Vdc via a USB connection. If
both POWERINand USB are connected, power will be supplied by whichever has the highest
voltage. If USB is the only power source, then the CS I/O port and the 12V, SW12, and 5V
terminals will not be operational. When powered by USB (no other power supplies connected)
Status field Battery = 0. Functions that will be active with a 5 Vdc source ( USB) include sending
programs, adjusting datalogger settings, and making some measurements.
NOTE:
The Status field Battery value and the destination variable from the Battery() instruction
2. Wiring panel and terminal functions 8