Campbell Scientific CR6 CR6 Measurement and Control System - Page 494

Section 11. Glossary 494 Term. desiccant A material that absorbs water vapor to dry the surrounding air. Term. DevConfig Device Configuration Utility (p. 116), available with LoggerNet, RTDAQ, PC400, or at www.campbellsci.com. Term. DHCP Dynamic Host Configuration Protocol. A TCP/IP application protocol. Term. differential A sensor or measurement terminal wherein the analog voltage signal is carried on two leads. The phenomenon measured is proportional to the difference in voltage between the two leads. Term. digital Numerically presented data. Term. Dim A CRBasic command for declaring and dimensioning variables. Variables declared with Dim remain hidden during datalogger operations. Term. dimension To code for a variable array. DIM example(3) creates the three variables example(1), example(2), and example(3). DIM example(3,3) creates nine variables. DIM example (3,3,3) creates 27 variables. Term. DNS Domain name system. A TCP/IP application protocol. Term. DSP Digital signal processing. A technique for converting analog voltage to a digital value by means of over-sampling with an analog-to-digital converter and applying statistical and filtering techniques to arrive at very-high resolution measurements. A resource for learning about DSP is the book The Scientist and Engineer's Guide to Digital Signal Processing by Steven W. Smith available at dspguide.com. Term. DTE Data terminal equipment. While the term has much wider meaning, in the limited context of practical use with the CR6, it denotes the pin configuration, gender, and function of an RS-232 port. The RS-232 port on the CR6 and on many third-party telecommunication devices, such as a digital cellular modems, are DCE. Attachment of a null-modem cable to a DCE device effectively converts it to a DTE device.