Campbell Scientific CR6 CR6 Measurement and Control System - Page 493
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Section 11. Glossary Term. data cache The data cache is a set of binary files kept on the hard disk of the computer running the datalogger support software. A binary file is created for each table in each datalogger. These files are set up to mimic the storage areas in datalogger memory, and by default are two times the size of the storage area. When the software collects data from a CR6, the data are stored in the binary file for that CR6. Various software functions retrieve data from the data cache instead of the CR6 directly. This allows the simultaneous sharing of data among software functions. Similar in function to a CR6 final-memory data tables, the binary file for a datalogger is set up as ring memory. This means that as the file reaches its maximum size, the newest data will begin overwriting the oldest data. Term. datalogger support software Campbell Scientific software that includes at least the following functions: o Datalogger telecommunications o Downloading programs o Clock setting o Retrieval of measurement data Datalogger support software includes PC200W, PC400, RTDAQ, and LoggerNet suite. For more information, see Datalogger Support Software - Overview (p. 89) and the appendix Datalogger Support Software List (p. 604). Term. data point A data value which is sent to final memory (p. 496) as the result of an output processing (data storage) instruction. Strings of data points output at the same time make up a record in a data table. Term. data table A concept that describes how data are organized in CR6 memory, or in files that result from collecting data in CR6 memory. The fundamental data table is created by the CRBasic program as a result of the DataTable() instruction and resides in binary form in main-memory SRAM. See the table CR6 Memory Allocation (p. 373). The data table structure also resides in the data cache (p. 493), in discrete data files on the CPU:, USR:, CRD:, and USB: memory drives, and in binary or ASCII files that result from collecting finaldata memory with datalogger support software (p. 493). Term. dc See Vdc (p. 512). Term. DCE Data communication 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. Interfacing a DCE device to a DCE device requires a null-modem cable. 493
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