Specifications

Appendix A. Glossary
A-5
modem/terminal any device which: 1) has the ability to raise the CR23X's
ring line or be used with the SC32A to raise the ring line and put the
CR23X in the Telecommunications Command State and 2) has an
asynchronous serial communication port which can be configured to
communicate with the CR23X.
multi-meter an inexpensive and readily available device useful in
troubleshooting data acquisition system faults.
mV the SI abbreviation for milliVolts.
NAN not a number. A data word indicating a measurement or processing
error. Voltage overrange, SDI-12 sensor error, and undefined
mathematical results can produce NAN.
Neighbor Device devices in a PakBus® network that can communicate
directly with an individual device without being routed through an
intermediate device. See also PakBus and Beacon Interval.
NIST National Institute of Standards and Technology
Node part of the description of a datalogger network when using LoggerNet.
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.
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 (Ω). 1 Ω 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
only when the Output Flag (Flag 0) is set. The first point of an Output
Array is the Output Array ID, which gives the Program Table Number and
the Instruction Location Number of the Instruction which sets the Output
Flag. The data points which complete the Array are the result of the
Output Processing Instructions which are executed while the Output Flag
is set. The Array ends when the Output Flag is reset at the end of the
table or when another Instruction acts upon the Output Flag. Output
occurs only when the output flag is set. (Section 2.1)
output interval the time interval between initiations of a particular Output
Array. Output occurs only when the Output Flag is set. The flag may be
set at fixed intervals or in response to certain conditions (Sections OV4
and 1.2.1).