Campbell-scientific CR9000X Measurement and Control System Manuel d'utilisateur Page 426

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Appendix E. Glossary
Node part of the description of a datalogger network when using
LoggerNetTM. Each node represents a device that the communications
server will dial through or communicate with individually. Nodes are
organized as a hierarchy with all nodes accessed by the same device
(parent node) entered as child nodes. A node can be both a parent and a
child.
NSEC 8 byte data type divided up as 4 bytes of seconds since 1990 and 4
bytes of nanoseconds into the second.
Null-modem a device, usually a multi-conductor cable, which converts an
RS-232 port from DCE to DTE or from DTE to DCE.
Ohm the unit of resistance. Symbol is the Greek letter Omega (). 1 equals
the ratio of 1 Volt divided by 1 Amp.
Ohms Law describes the relationship of current and resistance to voltage.
Voltage equals the product of current and resistance (V = I*R).
on-line data transfer routine transfer of data to a peripheral left on-site.
Transfer is controlled by the program entered in the datalogger.
output a loosely applied term. Denotes a) the information carrier generated by
an electronic sensor, b) the transfer of data from variable storage to final
storage, or c) the transfer of power from the CR1000 or a peripheral to
another device.
output array a string of data points output to Final Storage. Output occurs
when the data interval and data trigger are true. The data points which
complete the Array are the result of the Output Processing Instructions
which are executed while the Output Flag is set.
output interval the time interval between initiations of a particular data table
record.
output processing instructions process data values and generate Output
Arrays. Examples of Output Processing Instructions include Totalize,
Maximize, Minimize, Average, etc. The data sources for these
Instructions are values in Input Storage. The results of intermediate
calculations are stored in Intermediate Storage. The ultimate destination
of data generated by Output Processing Instructions is usually Final
Storage but may be Input Storage for further processing. The transfer of
processed summaries to Final Storage takes place when the Output Flag
has been set by a Program Control Instruction.
PakBus® is a proprietary telecommunications protocol similar in concept to
internet protocol (IP). It has been developed by Campbell Scientific to
facilitate communications between Campbell Scientific instrumentation.
parameter used in conjunction with CR1000 program Instructions, parameters
are numbers or codes which are entered to specify exactly what a given
instruction is to do. Once the instruction number has been entered in a
Program Table, the CR1000 will prompt for the parameters by displaying
the parameter number in the ID Field of the display.
E-6
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