Campbell Scientific CR200/CR200X-series Dataloggers - Manual (Page 182)

Appendix A. Glossary
the table is executed at midnight and every execution interval thereafter.
The table is executed for the first time at the first occurrence of the
Execution Interval after compilation. If the Execution Interval does not
divide evenly into 24 hours, execution will start on the first even second
after compilation.
SDI-12
Serial/Digital Data Interface at 1200 bps. Communication protocol for
transferring data between data recorders and sensors.
SDM
Synchronous Device for Measurement. A processor based peripheral device
or sensor that communicates with the CR200(X) via hardwire over short
distance using a proprietary CSI protocol. The CR200(X) datalogger is not
compatible with SDM devices.
Send
Denotes the program send button in LoggerNet / PC400 / RTDAQ /
PC200W datalogger support software.
serial
A loose term denoting output or a device that outputs an electronic series of
alphanumeric characters.
SI Système Internationale
The International System of Units.
signature
A number which is a function of the data and the sequence of data in
memory. It is derived using an algorithm which assures a 99.998%
probability that if either the data or its sequence changes, the signature
changes.
single-ended
Denotes a sensor or measurement terminal where in the analog voltage
signal is carried on a single lead, which is measured with respect to ground.
skipped scans
Occurs when the CR200(X) program is too long for the scan interval.
Skipped scans can cause errors in pulse measurements.
SP
Space
10