Specifications
Section 3. Overview
3-4
The CR1000 can be used as a PLC (programmable logic controller). Utilizing
peripheral relays and analog output devices, the CR1000 can manage binary
and variable control devices through the following output channels:
Read more! See Section 5.4 Control Output.
Continuous Analog Voltage Output: available by adding a peripheral analog
output device available from Campbell Scientific..
Digital I/O: 8 channels (C1 - C8) configurable for pulse output duration.
Switched 12 Volts (SW-12): controls (switches on / off ) primary battery
voltage under program control for use with external devices, such as
humidity sensors, requiring controlled 12 V. SW-12 can source up to 600
mA.
3.1.2.3 Grounding Terminals
Read more! See Section 7 Grounding.
Proper grounding will lend stability and protection to a data acquisition system.
It is the easiest and least expensive insurance against data loss -- and the most
neglected. The following terminals are provided for connection of sensor and
datalogger grounding:
Signal Grounds: 12 terminals (
) used as reference for single-ended analog
inputs, pulse inputs, excitation returns, and as a ground for sensor shield
wires. Signal returns for pulse inputs should use
terminals located next
to pulse inputs.
Power Grounds: 6 terminals (G) used as returns for 5V, SW12, 12V, and C1-
C8 outputs. Use of G grounds for these outputs minimizes potentially
large current flow through the analog voltage measurement section of the
wiring panel, which can cause single-ended voltage measurement errors.
Ground Lug: 1 terminal (
), the large ground lug is used to connect a heavy
gage wire to earth ground. A good earth connection is necessary to secure
the ground potential of the datalogger and shunt transients away from
electronics. Minimum 14 AWG wire is recommended.
3.1.2.4 Power Terminals
Read more! See Section 6 Power Supply.
Power In
Power Supply: One green plug (POWER IN): for connecting power from an
external power source to the CR1000. These are the only terminals used
to input battery power; other 12V terminals and the SW-12 terminal are
output only terminals for supplying power to other devices. Review
power requirements and power supply options in Section 6 CR1000
Pow
er Supply before connecting power.