Campbell CR1000 User Manual

Section 11. Glossary
Interval after compilation. If the Scan() Interval does not divide evenly into
24 hours, execution will start on the first even second after compilation.
Term. scan time
When time functions are run inside the Scan() / NextScan construct, time
stamps are based on when the scan was started according to the CR1000
clock. Resolution of scan time is equal to the length of the scan. See system
time
(p. 530).
Term. SDI-12
Serial Data Interface at 1200 baud. Communication protocol for transferring
data between the CR1000 and SDI-12 compatible smart sensors.
Term. SDM
Synchronous Device for Measurement. A processor-based peripheral device
or sensor that communicates with the CR1000 via hardwire over a short
distance using a protocol proprietary to Campbell Scientific.
Term. Seebeck effect
Induces microvolt level thermal electromotive forces (EMF) across junctions
of dissimilar metals in the presence of temperature gradients. This is the
principle behind thermocouple temperature measurement. It also causes
small, correctable voltage offsets in CR1000 measurement circuitry.
Term. ping
A CRBasic program execution mode wherein each statement is evaluated in
the order it is listed in the program. More information is available in section
Sequential Mode
(p. 153). See Term. pipeline mode (p. 523).
Term. semaphore (measurement semaphore)
In sequential mode, when the main scan executes, it locks the resources
associated with measurements. In other words, it acquires the measurement
semaphore. This is at the scan level, so all subscans within the scan (whether
they make measurements or not), will lock out measurements from slow
sequences (including the system background calibration). Locking
measurement resources at the scan level gives non-interrupted measurement
execution of the main scan.
Term. send
Send button in datalogger support software
(p. 95). Sends a CRBasic program
or operating system to a CR1000.
Term. serial
A loose term denoting output of a series of alphanumeric characters in
electronic form.
527

Campbell CR1000 Specifications

General

Power Requirements	9.6 to 16 VDC
Data Logger Operating System	CRBasic
Memory	4 MB
Analog Inputs	16 single-ended or 8 differential
Analog Input Resolution	13 bits
Analog Input Range	+/-2.5V
Digital I/O	8
Pulse Counters	2
Communication Ports	RS-232
Operating Temperature	-25°C to +50°C
Pulse Channels	4