Nortec Modbus User Manual download pdf (Page 14)

Control Signal Setting

By default the humidifier is configured operate on a hardwired control signal supplied through

the unit terminal strip. This can be changed to allow the humidifier to function entirely through

its Modbus or BACnet interface.

To adjust this setting:

Press the Menu icon on the lower left corner of the screen, to access the menu.

When prompted for a password, enter 0335 using the number pad. Press the Check Mark

icon to confirm.

Select the Configuration menu.

Select the Control Settings menu. The following settings can be adjusted:

Source

Analog: Use hardwired control signal

Modbus: Write control signal through Modbus interface

Control Mode

Demand: Use a demand control signal

RH P: Use a sensor value and proportional

RH PI: Use a sensor value and proportional-integral control band

Control Channels

Single: Use a signal channel control signal

Dual: Use a dual channel control signal

Note:

Refer to the CONTROL SETTING section of the NH Series Installation and Operation

Manual for more information on the above settings.

Press Check Mark to confirm choice and then Back repeatedly to return to the home screen

when complete.

This procedure is summarized below:

Main Menu > 0335 > Configuration > Control Settings >

Source: Analog, Modbus,

Control Mode: Demand, RH P, or RH PI

Control Channels: Single or Dual

Modbus Parameters

The NH-EL uses the following parameters for Modbus communication:

Signaling Type EIA-485

Transmission Mode RTU

Baud Rate 9600

Data Bits 8

Stop Bits 1

Parity Even

Address / Unit Number 10*

*Default, may vary for multi-unit orders.

It is important to note that the signaling type, transmission mode, data bits and stop bits cannot

be modified. Parity, baud rate and unit address can be modified as required.

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Nortec Modbus User Manual Page 14

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