Domino
DFRHT
The address n+3 reports two digital points that, when activ-
ated, signals the presence of the following conditions:
•DP ≥ thresh.1: the dew point is greater than or e ual to
a first threshold value specified by the content of the
output section of the module itself at address n, or by a
value in the memory of the module (see in the follow-
ing of this manual)
•DP ≥ thresh.2: the dew point is greater than or e ual to
a second threshold value specified by the content of
the output section of the module itself at address n+1,
or by a value in the memory of the module (see in the
following of this manual)
Output section
The module can feature, as said above, 2 output addresses
for setting the two dew point thresholds via bus; these ad-
dresses have to be enabled, if re uired, by the DFRHT
configuration panel provided by BDTools or DCP Ide, as
described in the following.
Said n the assigned base address, the information mapped
on the output section are the following:
Point n n+1
1
Value of
threshold 1
for dew point,
in tenth of °K
(Kelvin de-
grees multi-
plied by 10)
Value of
threshold 2
for dew point,
in tenth of °K
(Kelvin de-
grees multi-
plied by 10)
3
4
5
6
7
8
9
10
11
1
13
14
15
16
In details, the output addresses n and n+1 respectively re-
port:
•Threshold 1 to be compared to the the current dew
point value, in °K multiplied by 10; called X the desired
value in °C, to convert it to °K multiplied by 10 use the
formula (X+273)x10. The threshold in BDTools and
DCP Visio will be instead directly set in °C.
•Threshold 2 to be compared to the the current dew
point value, in °K multiplied by 10; called Y the desired
value in °C, to convert it to °K multiplied by 10 use the
formula (Y+273)x10. The threshold in BDTools and
DCP Visio will be instead directly set in °C.
If the output address has been enabled, the module will ex-
ecute the comparison between the current dew point and
the two just described values; in this way, a supervisor,
touch screen terminal or other master device can easily set
the thresholds because it is enough to write the desired val-
ues to the output addresses.
If instead the two threshold are fixed and it is not to modify
them, it is possible to save the output addresses disabling
them by DFRHT configuration panel provided by BDTools
or DCP Ide; in this case, the comparison will be made with
the two values written in the non volatile memory of the
module. In this case too, the two values in the memory can
be changed by DFRHT configuration panel.
Anyway, the result of the comparison between the dew
point and the two thresholds will affect the point 1 and 2 of
the input section at address n+3.
Using the digital points of DFRHT
As said before, DFRHT module provides, at input address
n+3, two digital points that will be activated when the fol-
lowing conditions occur:
•the dew point is greater than or e ual to a first
configurable threshold value
•the dew point is greater than or e ual to a second
configurable threshold value
The first point is normally used to activate the dehumidifier
when the dew point exceeds a given value (e.g. 14ºC)
The point 2 can be instead used to switch off the cooling
unit when the dew point exceeds another given value (e.g.
18ºC, also said safety value).
The availability of these digital points allows to implement
the dehumidifier management without using the DFCP con-
troller, or anyway this allows to simplify the programming of
the controller itself.
DFRHT configuration panel
The configuration panel, available in BDTools and DCP
Ide, allows to set DFRHT module.
The details will be described in the following. From the
main menu of BDTools or MCP Ide select Programming
and then DFRHT Configuration; the following windows will
be shown:
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