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Wired M-Bus • Water Meters flowIQ® 2101/3100 TECHNICAL DESCRIPTION
Kamstrup A/S · Technical Description · 55121944_A1_GB_08.2016
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The meaning of the A-Field
A-FIELD:
xxh
The primary address of the M-Bus water meter.
FDh
(253) The primary address of the M-Bus water meter in connection with secondary addressing.
However, in connection with RSP¬_UD the M-Bus water meter still replies with its own primary
address.
FEh
(254) Address to which all M-Bus water meters will reply.
By using this address only one M-Bus water meter can be connected. The M-Bus water meter still
replies with its own primary address.
(255) Joint address where all M-Bus water meters can receive data from the M-Bus Master, but replies
are not returned.
The meaning of the CI-Field
CI-FIELD:
50h
Application select/reset. Select is used for logger reading applications. A reset will select the default
application.
51h
Normal transmission of SND_UD, data send (M-Bus Master to M-Bus water meter).
52h
Opening for secondary addressing (selection of M-Bus water meter) is required.
72h
Respond in variable structure.
B8h
Baud rate shift to 300 baud.
BBh
Baud rate shift to 2400 baud.
BDh
Baud rate shift to 9600 baud.
BEh
Baud rate shift to 19200 baud.
72h
Long 12 bytes APL header in RSP_UD response from device
7Ah
Short 4 bytes APL header in RSP_UD response from device
78h
No APL header in RSP_UD response from device
A0h
Kamstrup specific from master to slave
A1h
Kamstrup specific from slave to master
Note: As the flowIQ® 2101/3100 M-Bus water meters supports auto baud rate detection, it is not necessary to
instruct them with a specific baud rate.