Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 464

Section 11. Glossary 464 RMS Root‐mean square, or quadratic mean. A measure of the magnitude of wave or other varying quantities around zero. RS‐232 Recommended Standard 232. A loose standard defining how two computing devices can communicate with each other. The implementation of RS‐232 in Campbell Scientific dataloggers to PC communications is quite rigid, but transparent to most users. Implementation of RS‐232 in Campbell Scientific datalogger to RS‐232 smart‐sensor communications is quite flexible. sample rate The rate at which measurements are made. The measurement sample rate is primarily of interest when considering the effect of time skew (i.e., how close in time are a series of measurements). The maximum sample rates are the rates at which measurements are made when initiated by a single instruction with multiple repetitions. scan interval The time interval between initiating each execution of a given Scan() of a CRBasic program. If the Scan() Interval is evenly divisible into 24 hours (86,400 seconds), it is synchronized with the 24‐hour clock, so that the program is executed at midnight and every Scan() Interval thereafter. The program is executed for the first time at the first occurrence of the Scan() Interval after compilation. If the Scan() Interval does not divide evenly into 24 hours, execution will start on the first even second after compilation. 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. 468). SDI‐12 Serial 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 CR1000 via hardwire over a short distance using a proprietary protocol.