Nortec Modbus User Manual download pdf (Page 34)

Modbus Parameters

The MHTC uses the following parameters for communication:

Signaling Type

EIA-485

Transmission Mode

RTU

Baud Rate

9600 (cannot be changed)

Data Bits

Stop Bits

Parity

None

Address / Unit Number

*Default, may vary for multi-unit orders.

It is important to note that the signaling type, transmission mode, baud rate, data bits and stop

bits cannot be modified. Parity and unit address can be modified as required.

The following points may be mapped for control:

Variable

Name

Description

Addr

Type

Format

Range

Unit

R/W

Details

CapLimit

Manual

Capacity Limit

40008

Holding

Integer

30 -

100

% Write Limits unit output.

RHDem1

Reads/writes

a control

signal to the

humidifier

40053

Holding

Integer

0 -

100

% Write

Writes a control

signal to the

humidifier. This input

only works if

humidifier is set to

network control

NetSensor set to 1)

in the control

settings. If the

system is set to

network control no

signal is detected,

the unit will display

the modbus timeout

error.

Set1

Reads/Writes

the desired

space

setpoint

40005

Holding

Integer

10 -

% Write

Used when

Hum_Control = 2 or

3 only

Disable

Remotely

disables

humidifier

40052

Holding

Integer 0 or 1 - Write

0 = Allow normal

humidifier operation

1 = Remotely

disables the

humidifier

Hum_Contr

Selects the

control type

that the

humidifier

operates on

40003

Holding

Integer 0 - 3 - Write

0 = Demand Signal

1 = On/Off Signal

2 = RH Sensor Value

(Use Proportional

control method)

3 = RH Sensor Value

(Use Proportional-

Integral control

method)

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Nortec Modbus User Manual Page 34

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