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Technical data radio interface
Frequency band: 868 MHz
Radio protocol: Wireless M-Bus (EN 13757-4) and according to
the Open Metering Standard.(OMS) different ra-
dio telegram contents are possible.
Data transmission: unidirectional, Standard T1-Mode (bidirectional
devices and other modes upon request)128-bit
AES encryption.
Transmission interval: depending on the used lithium battery and de-
pending on whether the meter has additional
inputs whose data will be transferred with. For
example: zelsius C5 with C-cell, no additional in-
puts: Standard 20 seconds; other congurations
are possible.
Transmitting power: up to 25 mW
Content radio data protocol (Standard)
Example Heat Meter Unit
Medium Thermal energy
Producer ZRI
Serial number 12345678
Version 12
Main energy meter 123456 kWh
Main volume meter 123456 L
Energy meter (consumption) on deadline 23456 kWh
Date of deadline 2013.12.31
Volume ow 127 l/h
Performance 329.7 W
Supply temperature 44.3 °C
Return temperature 25.1 °C
Error Code 0
Last previous month value 3456 kWh
other protocol values on request
Important Note
Devices, which are in sleep mode (Display: SLEEP 1) have to be activated
through keypress until the energy display shows up.
The optical interface has to be activated by means of the OptoHead through
keypress before reading out of the de vice.
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