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7.2.1 Communication via radio
The integrated radio module is an interface for communication with Diehl
Metering radio receivers.
Unidirectional communication has the following specification:
ƒ
The module transmits every 8 ... 256 s (send period 0.1 % of duty cycle
(min. 8s); variable, depending on protocol length and programming)
ƒ
The communication always transfers the currently measured data
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Transmission frequencies:
–
434 MHz, transmission power (EN 300 220-2 V3.2.1): 10mW e.r.p.
–
868 MHz, transmission power (EN 300 220-2 V3.2.1): 25mW e.r.p.
ƒ
Various Diehl Metering receivers are available for receiving the proto-
col (e.g. Bluetooth, GPRS, LAN, ...)
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The protocol corresponds to OMS Profile A or Profile B and is encrypted.
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Reading modes: Walk-By, Drive-By, Fixed-Network
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For problematic radio installations (shield) the external wireless
module set can also be used.
7.2.2 M-Bus Communication module
The M-Bus communication module is a serial interface for communication
with external devices (M-Bus control centres), e.g. IZAR CENTER. A num-
ber of meters can be connected to a control centre. The module contains
a 2-pole terminal strip with terminals marked 24, 25.
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The connection is not
polarity-sensitive and is
electrically isolated
ƒ
M-Bus protocol stan-
dardised according to
EN 1434;
ƒ
300 or 2400 baud
(auto baud detect)
ƒ
Connection option
2 x 2.5 mm²;
ƒ
Power consumption:
One M-Bus load
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