Specifications

Appendix A. Glossary
A-3
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 3
rd
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.
Earth Ground1) Using a grounding rod or another suitable device to tie a
system or device to the earth at the datalogger site. Such a connection is
used as a sink for electrical transients and possibly damaging potentials,
such as those produced by a nearby lightning strike. 2) A 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. See ground loop.
engineering units units that explicitly describe phenomena, as opposed to the
CR1000 measurement units of millivolts or counts.
ESD electrostatic discharge
excitation application of a precise voltage, usually to a resistive bridge circuit.
execution time time required to execute an instruction or group of instructions.
If the execution time of a Program Table exceeds the table's Execution
Interval, the Program Table will be executed less frequently than
programmed (Section OV4.3.1 and 8.9).
expression a series of words, operators, or numbers that produce a value or
result.
final storage that portion of memory allocated for storing Output Arrays.
Final Storage may be viewed as a ring memory, with the newest data
being written over the oldest. Data in Final Storage may be displayed
using the Mode or sent to various peripherals (Sections 2, 3, and OV4.1).
FTP File Transfer Protocol. A TCP/IP application protocol.
full duplex definition
garbage the refuse of the data communication world. When data are sent or
received incorrectly (and there are numerous reasons this happens) a
string of invalid, meaningless characters (garbage) results. Two common
causes are: 1) a baud rate mismatch and 2) synchronous data being sent to
an asynchronous device and vice versa.
ground being or related to an electrical potential of 0 Volts.
half duplex definition
Handshake, Handshaking the exchange of predetermined information
between two devices to assure each that it is connected to the other.
When not used as a clock line, the CLK/HS (pin 7) line in the datalogger
CS I/O port is primarily used to detect the presence or absence of
peripherals.
Hertz abbreviated Hz. Unit of frequency described as cycles or pulses per
second.