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Planning
Nortec RS
2596995_0_EN_1905
4.4.1.2 Digital Control Signals
The digital communications interface in the Nortec RS humidifier can be used to control the humidifier
output and change system configurations, or monitor its operation. Digital communication can be used
in conjunction with analog devices to regulate the humidifier operation. Condair recommends the use
of transducers for the control and high limit signals when using digital communications.
The Nortec RS humidifier integrates support for standard communication protocols such as BACnet IP,
BACnet MS/TP and Modbus RTU. The supported communication protocol can be selected and config-
ured from the touchscreen display. With optional hardware kits, the Nortec RS humidifier can also be
configured to communicate using LonWorks, or BTL-certified BACnet IP and BACnet MS/TP protocols
Note:
If using BACnet MSTP, verify PICS/BIBBs details with the building network operator to ensure
compatibility. Refer to the BACnet manual (Condair document 2574199) for PICS/BIBBs settings.
BACnet
The Nortec RS humidifier uses the connector (J6) on the integrated control board to connect with the
BMS using the BACnet Master/Slave Token Passing (MS/TP) communications protocol, and the Ethernet
port (J21) to connect with the BMS using the BACnet IP communications protocol. Refer to BACnet,
LonWorks Supplemental Installation and Operation Manual (Condair document 2574199) for control
points and connection details.
The following is a list of installation requirements for BACnet communications:
18-24 AWG shielded, twisted pair cable with 120 Ω impedance is recommended for BACnet MS/TP
communications. Refer to the BMS supplier for recommended maximum length of communication
cables.
Category (CAT) -5, -5E, or -6 cable with RJ-45 terminations is recommended for BACnet IP com-
munications.
Modbus RTU
The Nortec RS humidifier uses a three-pole connector (J6) on the integrated control board to facilitate
Modbus EIA-485, 2-wire communications with the BMS.
Refer to Modbus Installation and Operation Manual (Condair document 2560599) for the list of supported
Modbus parameters and connection/configuration details.
The following is a list of installation requirements for Modbus communications:
18-24 AWG shielded, twisted pair cable with 120 Ω impedance is recommended. CAT-5 cable is
also acceptable, but only uses two conductors and the cable shield – refer to the Modbus manual
for details.
To minimize signal loss, the cable run should not exceed 2200 feet (670 m).
To ensure communication reliability, Condair recommends that no more than 8 nodes are connected
to a single chain/bus.
LonWorks and BTL-Certified BACnet IP, Bacnet MS/TP
LonWorks and BTL-certified BACnet IP and BACnet MS/TP use an optional interface card mounted
on the integrated control board. Refer to BACnet/LonWorks Supplemental Installation and Operation
Manual (Condair document 2574199).
The following is a list of installation requirements for LonWorks and BTL-certified BACnet IP and
BACnet MS/TP communications:
