Instructions

UM-0085-B09 DT80 Range User Manual Page 410
RG
 peak-to-peak
The value of an alternating quantity measured from its negative peak to its positive peak.
Figure 180: Peak-to-peak measurement
 period
The time taken for a cyclic event to repeat itself. Reciprocal of frequency:
 =
1

 PLC
Programmable Logic Controller. Used to automate monitoring and control of industrial equipment.

plug-and-play
A device whose characteristics are automatically determined when it is plugged in. All USB devices are plug-and-
play.

polling
Requesting information

port
A plug, socket or interface that enables connection to another device for information transfer. For example, the DT80
has three ports for communicating with a host computer: Ethernet, USB and RS232.
 port (TCP/IP)
A logical endpoint for a connection between two applications over a TCP/IP network. This allows multiple
independent connections to exist over the one physical cable. For example, an application such as DeTransfer can
connect to port 7700 to access the logger's command interface, and at the same time a web browser can connect to
port 80 to access the logger's web interface.
 PPP
Point-to-Point Protocol. A low-level protocol that allows TCP/IP based protocols to be used over an RS232 or
wireless connection.
 process list
The part of a schedule command that follows the schedule header and trigger, and lists the processes you want the
schedule to carry out. It may include, for example, a channel list and an
IF command.

program
A DT80 program is a group of one or more jobs or commands that you send to the DT80.

protocol
The language (or set of rules) that devices use to communicate over a network. For the Information Superhighway,
think of protocols as the "rules of the road". All devices on a network must use the same protocol to communicate
with each other. See TCP/IP Concepts (P205).

RAM
Random Access Memory. Memory that allows the storage locations within it to be accessed (written to or read from)
directly (non-sequentially). This characteristic makes RAM very fast. Often simply called memory.
 RAM disk
An area of RAM configured by a software program to emulate a disk drive.

real-time
As it happens. The DT80 can return data directly to the host computer in real time — that is, as each scan is made,
its resulting data is returned to the host computer straight away and displayed on-screen immediately.
 resolution
The smallest detectable increment of measurement — that is, the smallest change in input that produces a
detectable change in output. In the field of data acquisition, resolution is the number of bits that the ADC uses to
represent the analog signal — the greater the resolution, the smaller the changes in input signal that can be
resolved/detected.