Technical
Manual
Temperature
Controller
SCN
‐
RT1
MDT technologies GmbH •
51766 Engelskirchen • Papiermühle 1
Tel.: +49-2263-880 • Fax: +49-2263-4588 • knx@mdt.de • www.mdt.de
21
The
changeover
of
the
operating
modes
via
1
Byte
occurs
by
only
one
object,
with
the
size
of
1
Byte.
Additional,
there
are
2
objects
for
the
visualization
available,
the
1
Byte
object
“DPT_HVAC
Status”
and
the
2
Byte
object
“DPT_RHCC
Status”.
For
the
changeover
of
the
operating
modes,
a
Hex
‐
value
is
sent
to
the
object
“mode
selection”.
The
object
evaluates
the
received
value
and
switches
the
belonging
operating
mode
on
and
the
active
operating
mode
off.
If
all
operating
modes
are
switched
off
(Hex
‐
value=0),
the
operating
mode
standby
will
be
switched
on.
The
Hex
‐
values
for
the
operating
modes
are
shown
at
the
chart:
Operating
mode
Hex
‐
Value
Comfort
0x01
Standby
0x02
Night
0x03
Frost/Heat
protection
0x04
Chart
19:
Hex
‐
Values
for
operating
modes
The
following
example
shall
clarify
how
the
controller
handles
received
Hex
‐
values
and
switches
operating
modes
on
or
off.
The
chart
is
to
read
from
the
top
to
the
down.
Example:
The
priority
was
set
as
Frost/Comfort/Night/Standby.
received
Hex
‐
value
Handling
adjusted
operating
mode
0x01
Comfort=1
Comfort
0x03
Comfort=0
Night=1
Night
0x02
Night=0
Standby=1
Standby
0x04
Frost
‐
/Heat
protection=1
Standby=0
Frost
‐
/Heat
protection
Chart
20:
Example
operating
mode
changeover
via
1
Byte
The
DPT
HVAC
Status
communication
object
sends
the
hex
value
for
the
adjusted
operating
mode.
When
more
than
one
testify
is
valid,
the
hex
values
are
added
and
the
communication
object
sends
the
added
value.
The
hex
values
can
be
read
from
visualization
afterwards.
The
following
chart
shows
the
hex
values
for
the
single
messages:
Bit
DPT
HVAC
Status
Hex
‐
Value
0
Comfort
1=Comfort
0x01
1
Standby
1=Standby
0x02
2
Night
1=Night
0x03
3
Frost
‐
/Heat
protection
1=
Frost
‐
/Heat
protection
0x04
4
5
Heating/Cooling
0=Cooling/1=Heating
0x20
6
7
Frost
alarm
1=Frost
alarm
0x80
Chart
21:
Hex
‐
Values
DPT
HVAC
Status
If
you
heat
at
the
comfort
mode,
the
communication
object
will
send
the
value
20
(for
heating)
+1
(for
the
comfort
mode)
=21.
