Section 11. Glossary
Term: FTP
File Transfer Protocol. A TCP/IP application protocol.
Term: full-duplex
A serial communication protocol. Simultaneous bi-directional
communications. Communications between a CR800 serial port and a PC is
typically full duplex.
Reading list: simplex
(p. 515), duplex (p. 282), half duplex (p. 501), and full duplex (p.
500).
Term: frequency domain
Frequency domain describes data graphed on an X-Y plot with frequency as
the X axis. VSPECT
(p. 521) vibrating wire data are in the frequency domain.
Term: frequency response
Sample rate is how often an instrument reports a result at its output;
frequency response is how well an instrument responds to fast fluctuations on
its input. By way of example, sampling a large gage thermocouple at 1 kHz
will give a high sample rate but does not ensure the measurement has a high
frequency response. A fine-wire thermocouple, which changes output quickly
with changes in temperature, is more likely to have a high frequency
response.
Term: 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) often results. Two common causes are: 1) a
baud-rate mismatch and 2) synchronous data being sent to an asynchronous
device and vice versa.
Term: 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.
Term: ground
Being or related to an electrical potential of 0 volts.
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