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TECHNICAL DESCRIPTION Wired M-Bus • Water Meters flowIQ® 2101
/
3100
4
Kamstrup A/S · Technical Description · 55121944_A1_GB_08.2016
1
Introduction
This technical description describes the wired M-Bus interface of water meters flowIQ
2101 and flowIQ
3100.
For further technical information about these water meters, please refer to their respective Technical Description.
1.1
M-Bus
M-Bus is a bus system especially suited for communication with consumption meters. The system consists of an
M-Bus Master and one or more meters with M-Bus interface.
M-Bus is standardized in the European standard EN 13757, as well as in the OMS TR02.
1.2
M-Bus communication
Communication on the M-Bus is an asynchronous serial bit transmission in half duplex mode, which means that it is
possible only to transmit one way at a time on the M-Bus.
The framing of the communication is 1 start bit, 8 data bits, 1 parity bit (even) and 1 stop bit.
The M-Bus is communicating via voltage modulation from the M-Bus Master to the M-Bus water meter and current
modulation from the M-Bus water meter to the M-Bus Master. Communication media is via an ordinary two-wire
cable. A twisted pair, non-shielded cable is recommended.
2
M-Bus water meter flowIQ® 2101/3100
The M-Bus water meter supports primary, secondary and enhanced secondary addressing as well as 300, 2400 and
9600 baud communication speed.
The M-Bus water meter flowIQ® 2101/3100 are designed with manufacturer specified VIF extensions, so called
VIFE codes.
These VIFE codes are formatting the data, whereby decoding of the content is much easier, as when using
manufacturer specified data.
The connection of the M-Bus water meter and the M-Bus network is realized with a fixed two wire cable.