Campbell Scientific CR9000X Measurement and Control System - Manual (Page 424)

Appendix E. Glossary
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.
FLOAT 4 byte floating point data type. Default CR1000 data type for Public
or Dim variables. Same format as IEEE4. IEEE4 is the name used when
declaring data type for stored data table data.
full duplex systems allow communications simultaneously in both directions.
FP2 2 byte floating point data type. Default CR1000 data type for stored data.
While IEEE 4 byte floating point is used for variables and internal
calculations, FP2 is adequate for most stored data. FP2 provides 3 or 4
significant digits of resolution, and requires half the memory as IEEE 4.
garbage the refuse of the data communication world. When data are sent or
received incorrectly (there are numerous reasons why 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.
global variable a variable available for use throughout a CRBASIC program.
The term is usually used in connection with subroutines, differentiating
global variables (those declared using Public or Dim) from local
variables, which are declared in the Sub () and Function() instructions.
ground being or related to an electrical potential of 0 Volts.
half duplex systems allow bi-directional communications, but not
simultaneously.
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.
Hello Exchange the process of verifying a node as a neighbor.
Hertz abbreviated Hz. Unit of frequency described as cycles or pulses per
second.
HTML Hypertext Markup Language. A programming language used for the
creation of web pages.
HTTP Hypertext Transfer Protocol. A TCP/IP application protocol.
IEEE4 4 byte floating point data type. IEEE Standard 754. Same format as
FLOAT. FLOAT is the name used when declaring data type for Public or
Dim variables.INF infinite or undefined. A data word indicating the
result of a function is infinite or undefined.
Initiate telecommunication is a name given to a processes by which the
CR1000 initiates telecommunications with a PC running appropriate CSI
datalogger support software. Also known as “Callback.”
E-4