ZETRON 1708 - Page 74

Glossary
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Controller
In this manual, the word “controller” refers to the device
that interfaces between the computer controlling the
SCADA system and a radio transceiver.
Controller Address
The device address of a Controller.
Counter
The counter value is a count of the number of times the
digital input on the core module activates.
Data address exception
An error indication in the MODBUS protocol that occurs
when a query is sent to an illegal data address. It can also
occur if the query addresses too many addresses at once.
Data value exception
An error indication in the MODBUS protocol that occurs
when an attempt is made to write an illegal data value to a
location. For example, attempting to set an output with a
maximum value of 5 to 10 volts.
Dedicated leased line
See leased line.
Device
In this manual, the word “device” refers to the Model 1700
Controller, the Model 1708/1716 RTU, or other similar
units.
Device address
The address used by the SCADA program to contact a
specific device.
Digital I/O module
I/O module that connects its device to equipment to be
monitored or controlled by the SCADA system. The
module inputs and outputs digital signals.
DIP switch
A small enclosure containing a row of on/off switches that
are used in a manner similar to jumpers for configuring
electronic hardware. The switch takes its name from the
fact that it fits into the same hole pattern used for DIP-style
integrated circuits. DIP switch packages typically come
with either four or eight switches.
Direct serial
communications
A method of communication where computers and devices
are connected without a modem and use serial
communication.
Enclosure
The general term used in this manual for the structure that
the modules sit in. See NEMA enclosure or Z-Box.