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DN-Series Integrated Programmable Controls
DOAS
IO Configuration
Refers to the specific wiring terminals on the controller that are assigned for each Input
or OutputIP
IP Address
A unique string of numbers separated by periods that identifies each computer using the
Internet Protocol to communicate over a network
Hot Gas Reheat (HGRH)
Used in dehumidification, hot gas reheat relies on an additional coil downstream of the cooling
coil in which the hot refrigerant piping is in contact with the supply air. This allows a portion of
the refrigerant cycle's rejected heat to be reclaimed as reheat. The amount of refrigerant piped
to the coil is modulated to maintain a supply temperature during dehumidification.
Hysteresis
The hysteresis is a value that is added to a setpoint for a specific control option to turn on, and
then it turns off at setpoint. This helps prevent over cycling of the controlled device.
I/O
Refers to all of the inputs and outputs such as sensors and control to fans.
Modbus
Modbus is a serial communications protocol for use with programmable logic controllers
(PLCs). It is a standard communication protocol, and it is now a commonly available means of
connecting industrial electronic devices. Modbus enables communication among many devices
connected to the same network, for example a system that measures temperature and humidity
and communicates the results to a computer. Modbus is often used to connect a supervisory
computer with a remote terminal unit (RTU) in supervisory control and data acquisition systems.
Modbus RTU
—see Modbus, above.
Modbus RTP
—see Modbus, above.
NAND Memory
NAND flash memory is a type of non-volatile storage technology that does not require power in
order to retain data. The technology is used in common storage devices such as flash drives,
solid-state drives and memory cards.
NODE
Any system or device connected to a network is also called a node. For example, if a network
connects a file server, five computers, and two printers, there are eight nodes on the network.
Each device on the network has a network address, such as a MAC address, which uniquely
identifies each device.
PI Control
The output of PID controllers will change in response to a change in process variable or
setpoint.
RJ-45 jack
RJ-45 is a standard type of connector for network cables. RJ-45 connectors are most
commonly seen with ethernet cables and networks. RJ-45 connectors feature eight pins to
which the wire strands of a cable interface electrically. Standard RJ-45 pinouts define the
arrangement of the individual wires needed when attaching connectors to a cable. Several other
kinds of connectors closely resemble RJ-45 and can be easily confused for each other.
RUT
Remote User Terminal. The RUT is the User Interface where a person can view current
operating conditions or status, make changes to setpoints and otherwise control the
operation of the air handler. The Carel RUT is an electronic device that has multiple push
buttons and a viewing screen and is connected to the Carel Controller by means of a
common telephone cable.
