Modbus Installation | 36
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 interface.
To adjust this setting:
1 Press the Menu key to access the menu.
2 Select the User options and press Set.
3 When prompted for a password, enter 8808 using the arrow keys. Confirm the password
with set.
4 Select the Controls menu and press the Set key. The following settings can be adjusted:
Analog: Use hardwired control signal
Modbus: Write control signal through Modbus interface
External: Use a demand control signal
Int(p): Use a sensor value and proportional
int(pi): Use a sensor value and proportional-integral control band
Setting not relevant when writing control signal through Modbus.
Note: Refer to the MHTC Humidifier Configuration section of the MH Series Installation and
Operation Manual for more information on the above settings.
1 Press Esc repeatedly to return to the home screen when complete.
This procedure is summarized below:
Menu > User > 8808 > Controls >
Signal Source: Analog or Modbus
Hum. Control: External, Int(p), or Int(pi)
Control Sign: As required
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