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If fewer read-outs are carried out, the unused ‚credit’ is stored in the instrument and can be used later.
During M-Bus communication with the calculator the other interfaces (push-button, optical interface) of the device
cannot be used.
13.2.6
M-Bus addresses
Calculators with the M-Bus option can be addressed primarily or secondarily.
Both addresses can be set via the optical interface using the Device Monitor or via the M-Bus interface.
The factory setting of the ID-No. (secondary address) is identical to the serial no.
13.3
Radio interface wireless M-Bus EN 13757-3, EN 13757-4 (optional)
The radio interface is for the transmission of meter data (absolute values).
General information about the radio interface
Installation of radio components between or behind heating pipes, or the presence of other bulky obstacles directly
over or in front of the housing must be avoided.
The transmission quality (range, telegram processing) of radio components can be negatively influenced by
instruments or equipment with electromagnetic emissions, such as telephones (particularly LTE mobile radio
standard), Wi-Fi routers, baby monitors, remote control units, electric motors, etc.
In addition, the construction of the building has a strong influence on the transmission range and coverage.
Furthermore, when using installation boxes (substations) they must be equipped with non-metallic covers or doors.
The factory-setting of the meters clock is standard (winter) Central European Time (GMT +1). There is no automatic
changeover to daylight savings (summer) time.
The radio function is deactivated upon delivery (factory-setting). See section 0 “
*Factory settings may vary from the
Activation of the radio interface”.
13.3.1
Technical data radio
Frequency
868 MHz
Transmission power
up to 12 dBm
Protocol
wireless M-Bus based on EN 13757-3
Selectable modes
S1/T1/C1
Telegrams
-
Short telegram conform to AMR (OMS-Spec_Vol2_Primary_v301): energy
(heat/cooling energy, pulse input 1, pulse input 2), total volume, flow, power,
information message, return flow temperature, temperature difference
-
Long telegram for walk-by read-out: energy (heat/cooling energy, pulse input 1,
pulse input 2), total volume, information message, 15 monthly values
Encryption
AES: Advanced Encryption Standard; key length: 128 bits
13.3.2
Radio configuration*
Parameter
Possible settings
Factory setting
Mode
S1/T1/C1; unidirectional
T1 (unidirectional)
Transmission period
00:00 - 24:00; any time period in the day
7:00 am - 7:00 pm
Transmission interval 120 seconds - 240 minutes
120 seconds (heat meters)
Weekdays
Monday – Sunday (any weekday)
Monday - Friday
Weeks in a month
1 – 4 (4: uninterrupted, incl. a possible 5
th
week)
1 – 4 (4: uninterrupted)
Months
1 - 12
1 - 12
Radio activation date 01.01 - 31.12. (day. Month)
not set
AES-128- Encryption
-
Not encrypted;
-
Encrypted:
-
Master Key
Master Key; not activated