Nortec Modbus User Manual

Modbus Installation and Operation Manual Using Modbus with Nortec Humidifiers. Includes installation, operation maintenance and

Figure 4: TC Modbus Wiring Diagram Modbus Installation | 7

Figure 5: MES2 and RH2 Modbus Wiring Diagram 8 |Modbus Installation

Figure 6: NHRS Modbus Wiring Diagram Modbus Installation | 9

Addressing and Communications Once the humidifier has been wired to the network, control variables must be mapped to allow for control of the humidif

Control Signal Setting By default the humidifier is configured operate on a hardwired control signal supplied through the unit terminal strip. This

The following points may be mapped for control: Parameter Name Description Modbus Addr. Type Format Range Unit R/W Details Dinput_A1 Write RH or Dem

SP_Chan_B1 Writes the desired space setpoint for control channel 1 for cylinder B 40008 Holding Register Integer 0 - 95 % Write Use only with NH-E

Fan_ Activate_B Indicates if air handle or furnace is activated for cylinder B 30019 Input Register Integer 0 or 1 - Read 0 = Not Activated 1 = Ac

NHTC Electrode Steam Humidifiers After wiring connections have been completed, the humidifier needs to be setup to operate and communicate through th

Control Signal Setting By default the humidifier operation is configured on a hardwired control signal supplied through the unit terminal strip. Th

Thank you for choosing Nortec. Proprietary Notice This document and the information disclosed herein are proprietary

Modbus Parameters The NHTC uses the following parameters for communication: Signaling Type EIA-485 Transmission Mode RTU Baud Rate 9600 Data Bits

The following points may be mapped for control: Variable Name Description Addr. Type Format Range Unit R/W Details CapLimitCyl1 Sets a manual capaci

Set2Cyl2 Writes the desired space setpoint for control channel 2 for cylinder 2 41010 Holding Register Integer 30-95 % Write Use only with NHTC-15

Cyl2OpTime Reads operating time for cylinder 2 31213 Input Register Integer 0 - 65535 5 min Read Reads operating time for cylinder 2 (NHTC-150 and N

GSTC Gas Fired Steam Humidifiers After wiring connections have been completed, the humidifier needs to be setup to operate and communicate through t

To adjust this setting: 1 Press the Menu key to access the menu. 2 When prompted for a password, enter 0335 using the arrow keys. Confirm the pass

The following points may be mapped for control: Variable Name Description Addr Type Format Range Unit R/W Additional Details RHDem1 Write RH o

InputType Confirms the control type that the humidifier operates on 40007 Input Register Analog 0,1,2,3 - Read 0 = Demand Signal 1 = On/Off Sig

SETC Steam Exchange Humidifiers After wiring connections have been completed, the humidifier needs to be setup to operate and communicate through th

Control Signal Setting By default the humidifier is configured operate on a hardwired control signal supplied through the unit terminal strip. This

Contents 2 Introduction 2 Requirements 2 Wiring Connections 10 Addressing and Communication 10 NH-EL 15 NHTC 21 GSTC 25 SE

The following points may be mapped for control: Variable Name Description Addr Type Format Range Unit R/W Additional Details RHDem1 Write RH o

NetSensor Confirms the system control type 40226 Input Register Binary 0,1 - Read 0 = Hard wired control signal 1 = Use Modbus to write control si

MHTC Evaporative Media Humidifiers After wiring connections have been completed, the humidifier needs to be setup to operate and communicate through

Control Signal Setting By default the humidifier is configured operate on a hardwired control signal supplied through the unit terminal strip. This

Modbus Parameters The MHTC uses the following parameters for communication: Signaling Type EIA-485 Transmission Mode RTU Baud Rate 9600 (cannot be c

NetSensor Switches between hard wired or network control signal 40002 Holding Register Integer 0 or 1 - Write 0 = Wired Analog Sensor/Demand 1 = M

MES2 and RH2 Models The default Modbus address for a humidifier is 1. To view or change the unit number: 1 Establish Modbus communications and m

The following points may be mapped for control: Variable Name Description Addr Type Format Range Unit R/W Details HumEnable Configures how humidifi

Baud Sets the Modbus baud rate 40202 Holding Register Integer 0,1,2 - Write Changes to this variable do not take effect until the humidifier has b

ForceReset Resets the controller and restarts in standby. 40007 Holding Register integer 0,255 - Write Write 255 to this register to reset the con

CAUTION: Servicing • Disconnect main power before any servicing. • The plumbing and electrical compartments contain high voltage components and

Status Displays status of various components. 30107 Input Register Integer 0 - 128 - Read Significant bits: 1 (Bit 0), 2 (Bit 1), 4 (Bit 2), 8 (Bi

CtrlStatus2 Hardware status Port D_E 30110 Input Register Integer 0-32768 - Read Bit 4 - MODBUS Control Active (0 = J26 installed) Bit 9 - FILL (1 =

NHRS Electric Steam Humidifiers After wiring connections have been completed, the humidifier needs to be setup to operate and communicate through th

Modbus Parameters The NHRS uses the following parameters for communication: Signaling Type EIA-485 Transmission Mode RTU Baud Rate 9600 Data Bits 8

The following points may be mapped for control: Variable Name Description Addr Type Format Range Unit R/W Details CapLimit Set a manual capacity re

Troubleshooting Problem Resolutions Cannot see/change set point over Modbus. Check control type. Demand type controls use internal algorithms to ge

Invalid data Check Modbus addresses for conflicts. Each Modbus device on the network must have a unique address. Devices (humidifiers or otherwise)

Figure 7: Humidifier COM port 3 Route the ribbon cable through the punch out on the humidifiers front electrical panel Figure 8: Routing of Rib

4 Connect the ribbon cable 20 pin side to the Logic Card. Figure 9: Pin connection for Ribbon cable 5 Configured dipswitch settings according t

6 Connect the RJ-11 cable to the corresponding jack on the logic card. Figure 11: RJ-11 Jack Location on Logic Card 7 Mount logic card with nylo

Introduction Many Nortec humidifiers feature control boards that include Modbus RTU and can connect to Modbus networks right out of the box. This d

8 Mount the Terminal strip (3 pole) below or above the existing NHRS low voltage terminal strip Figure 13: Low voltage terminal strip on NHRS Humi

Warranty Nortec Humidity Inc. and/or Nortec Humidity Ltd. (hereinafter collectively referred to as THE COMPANY), warrant for a period of two y

U.S.A. 2700 90th St. Sturtevant, WI 53177 835 Commerce Park Dr. Ogdensburg, NY 13669-2209 CANADA 2740 Fenton Road Ottawa, Ontario K1T 3T7 TEL: 1.

connected to a single chain/bus. The humidifiers should be the same type but do not need to be the same capacity. For example it is not recommended

NH-EL Models The NH-EL models use a 3 pole connector on the main processor card for Modbus connection. This 3 pole connector is provided with all NH-

NHTC, GSTC, SETC, and MHTC Models The NHTC, GSTC, SETC, and MHTC models use a multifunction RJ45 plug on the mainboard to provide Modbus communicatio

Figure 3: NH-EL Modbus Wiring Diagram 6 |Modbus Installation