Siemens Synco OZW772 Series Commissioning Instructions page 151

Communication
properties of data
points
Siemens
Building Technologies
For energy meters, the same data type must be used as specified by the producer
for display purposes. This is the only way to avoid a loss in accuracy on large
numbers, since large floating point numbers it is rounded off to the next displayable
value.
Data points for types 12.xxx, 13.xxx and 14.xxx are labeled with the definition of
the counter medium as energy meter. So that the following data is written once a
day to the consumption data file. See sections:
·
Meter medium.
·
Identification number.
Data point value
"Meter medium" defines what is actually measured:
A unique identification number of the meter used (0 - 99999999) is entered under
"Identification number".
Data points can have various communication properties. They are defined in KNX
as flags. The flags can be unset (0) or set (1).
Flag Meaning
C Communications
R Read
W Write
T Transfer
U Refresh
Flags are preset on participating devices/actuators/sensors.
Some examples of typical communication properties:
Device function
Displays (state, e.g. room temperature)
Send (trigger, e.g. light switch)
Send + display (state + trigger, e.g. heating setpoint).
Web server OZW772... V6.0
KNX S-Mode
Description (for set flag = 1)
Communication is possible via the bus.
The data point can be read via the bus.
The data point can be described via the bus.
A change in data point is sent via the bus.
The data point can be updated by other participants.
Set flags
C W T U
C T
C R W T U
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CE1C5701en
2015-10-12