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PC104-PLUS1500
10
APPENDIX
10.1 Glossary
Term
A/D converter
Acquisition
Analog
AND connection
Baud rate
Bus
Clock
Creeping distance
D/A converter
Data acquisition
DC voltage
Differential inputs
(DIFF)
Digital signal
Table 10-1: Glossary
= ADC
An electronic device that produces a digital output directly
proportional to an analog signal output.
The process by which data is gathered by the computer for
analysis or storage.
Continuous real time phenomena
In the digital technology these connections are realized by the
corresponding gates: AND-Gate, OR-Gate etc. Usually, the
English word AND, OR, Inverter and EXOR are used. In
AND-connections all input variables all must be on logic 1, if
the output also becomes "true". The AND-connection is also
known as conjunction.
Serial communications data transmission rate expresses in bits
per second (b/s)
The group of conductors that interconnect individual circuitry
in a computer. Typically, a bus is the expansion vehicle to
which I/O or other devices are connected. Examples of PC
buses are PCI, PC Card (PCMCIA), ISA (AT), and EISA bus.
A circuit that generates time and clock pulses for the
synchronisation of the conversion
In order to avoid the danger of the effects of electrical voltages
and currents for electrical-mechanical components, it is
required to keep minimum isolation distances. The creeping
distance is the shortest distance alongside of an isolation
surface between two reference points (contact elements).
= DAC
A device that converts digital information into a corresponding
analog voltage or current.
Gathering information from sources such as sensors and
transducers in an accurate, timely and organized manner.
Modern systems convert this information to digital data which
can be stored and processed by a computer.
= Direct current voltage
DC voltage means that the voltage is constant respecting the
time. It will always fluctuate slightly. Especially at switching
on and switching off the transition behaviour is of high
significance.
An analog input with two input terminals, neither of which is
grounded, whose value is the difference between the two
terminals.
A signal which has distinct states. Digital computers process
data as binary information having either 1 or 0 states.
Description
Appendix
43
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