Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 453

Section 11. Glossary 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. DNS Domain name system. A TCP/IP application protocol. DTE Data terminal equipment. While the term has much wider meaning, in the limited context of practical use with the CR1000, it denotes the pin configuration, gender, and function of an RS‐232 port. The RS‐232 port on the CR1000 and on many third‐party telecommunications 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. Duplex Can be half or full. Full‐duplex is simultaneous, bidirectional data. Duplex The percentage of available time a feature is in an active state. For example, if the CR1000 is programmed with 1 second scan interval, but the program completes after only 100 millisecond, the program can be said to have a 10% duty cycle. Earth Ground A grounding rod or other suitable device that electrically ties a system or device to the earth. Earth ground is a sink for electrical transients and possibly damaging potentials, such as those produced by a nearby lightning strike. Earth ground is the preferred reference potential for analog voltage measurements. Note that most objects have a "an electrical potential" and the potential at different places on the earth ‐ even a few meters away ‐ may be different. engineering units Units that explicitly describe phenomena, as opposed to the CR1000 measurement units of milliVolts or counts. ESD Electrostatic discharge 453