Nortec Modbus - Manual (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 8
Stop Bits 1
Parity None
Address / Unit Number 1*
*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
Register
Integer
30 -
100
% Write Limits unit output.
RHDem1
Reads/writes
a control
signal to the
humidifier
40053
Holding
Register
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
Register
Integer
10 -
90
% Write
Used when
Hum_Control = 2 or
3 only
Disable
Remotely
disables
humidifier
40052
Holding
Register
Integer 0 or 1 - Write
0 = Allow normal
humidifier operation
1 = Remotely
disables the
humidifier
Hum_Contr
ol
Selects the
control type
that the
humidifier
operates on
40003
Holding
Register
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)
Modbus Installation | 31