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U5 Main Contactor Switched Off During Blow-Down
With this parameter, one can specify the status of the “On” / “Off”
safety contactor. At the “on” setting, the control will switch off the
contactor during the blow-down procedure.
This setting could be useful if the power supply line is routed
through a sensitive residual-current circuit breaker.
U6 Controls
With parameter U6, one can set the humidifier control type. For
an example of the programming sequence used to modify this
parameter, see „Parameter Setting with Codes (P0=010) /
Advances Customer Level“.
7.5 Computer Interface
As an option, the Comfort / Comfort Plus Control can be
equipped with an RS485 or RS232 computer interface. It forms
the basis for the Modbus RTU protocol that is integrated in the
control software.
RS485:
The optional interface RS485 meets the American Electronics
Industry Association (EIA) Standard. Data is transmitted over
two cables.
RS485 interface hardware supports connections to a field bus
(i.e. Profibus, Bitbus, EIB,...)
The serial interface with 3-pole connector is used for transmis-
sion of status messages and operational values.
Operational parameters can be entered and modified using this
interface.
The unit can be switched on and off remotely
For information on the Modbus RTU protocol, consult with
HygroMatik.
Custom software adapted to interface types is written by the
customer.
Built-In Terminal ST8
Pin Assignment C TxD
B RxD
A Gnd
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