Nortec GS User Manual

63Installation
Nortec GS
2583703_EN_1608
5.11.3.7 Modbus Connection
The Nortec GS humidier comes standard with a Modbus communications interface, which can be used
to remotely control its output or monitor its operation.
Refer to Figure 33 and connect the Modbus communication cable to the Nortec GS humidier as follows:
1. Connect a Modbus cable to the connector J6 on the Nortec GS control board. Refer to Table 18 for
Modbus cable requirements, and Table 19 for communication parameters. Contact your Nortec rep-
resentative if assistance is needed to change the default communication parameters.
Note: The jumper JP7 on the control board must be installed to activate Modbus or BACnet MSTP
communication via RS485 interface (J6). If the jumper is not installed, no communication will take
place through J6.
2. Install the jumper JP4 on the control board if the Nortec GS humidier is the rst or last unit in the
network.
Figure 33:
ethernetUSB
comm port
RFB
ACC
J22
LED
J18
display
J17
display
U
U
U
U
J15
J1
J2
J3
J6
J12
J10
J14
J19
J23 J21
J16
CONTROL
BOARD
Modbus
Linkup
battery
SIM
card
JP11
JP8
JP7
JP4
J6
Modbus
JP8
JP7
JP4
Modbus Connection on Nortec GS Humidier
JP4 Jumper – for activating the termination resistor for Modbus or BACnet MSTP network
J6 Connector, Modbus (RS485 interface)
JP7 Jumper – for activating Modbus or BACnet MSTP communication via RS485 interface (J6)
Table 18: ModBus Cable Requirements
BMS Protocol Signal Type Recommended Cable
Maximum Distance from
Nortec humidier to BMS
Modbus EIA-485, 2-wire 18-24 AWG shielded, twisted
pair, 120Ω *
2200 ft (670 m)
* Connect humidiers in a daisy chain to the Modbus RTU. Ground shield at on end only – either at the BMS or the humidier.
Table 19: Modbus Communication Parameters
Parameter Default Adjustable Range
Signal type EIA-485 –
Transmission mode RTU –
Baud rate 9600 110, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 76800 or 115200
Data bits 8 –
Stop bits 1 –
Parity Even Odd, Even, None
Address 10 1-247
Time out 300 s 1-300 s

Nortec GS Specifications

General

Brand	Nortec
Model	GS
Category	Humidifier
Language	English