Kamstrup M-Bus Parts list manual

M-Bus
Technical Description
Kamstrup A/S
Industrivej 28, Stilling
DK-8660 Skanderborg
TEL: [phone]
FAX: [phone]
[e-mail]
www.kamstrup.com

5511-710 GB/12.2004/Rev. C1
Contents
2
1. Technical description M-Bus 3
Introduction 3
2. M-Bus System 4
M-Bus system components 4
Communication 4
Addresses of M-Bus Slave units 4
Primary addressing 4
Secondary addressing 4
Operation 5
3. M-Bus Master 6
4. M-Bus Slave for MULTICAL®7
5. M-Bus Slave for MULTICAL®Compact/MULTICAL® 401 8
6. M-Bus Slave for Kamstrup 162/382/351 Combi 9
7. M-Bus Cascade module 10
8. M-Bus Modem 12
Test 12
9. Installation of M-Bus 13
Cable length 13
Mounting 13
10. Data reading of M-Bus 15
Data reading of heat meters 15
M-Bus Slave for MULTICAL®III/MULTICAL®15
M-Bus Slave for MULTICAL®Compact/MULTICAL®401 16
Data reading of Kamstrup 162/382/351 Combi 16
M-Bus Slave for Kamstrup 162/382/351 Combi 16
Reading equipment 16
11. Protocol 17
Commands 17
The individual commands in detail 17
M-Bus Master to M-Bus Slave 17
M-Bus Slave to M-Bus Master 18
Communication process 19
Reading of fresh data through e.g. data logging 20
M-Bus Slave and foreign M-Bus masters 20
Appendix 20
Physical properties 26

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1. Technical description M-Bus
Introduction
This document describes the use of Kamstrup’s
M-Bus system.
M-Bus is used for electronic reading of district heat
meters.
As the data route from meter to accounting
program is electronic, the data is secured against
errors. It is easy and simple to equip Kamstrup
energy meters with an M-Bus Slave, which is
inserted at the modular space in the energy meter.
It is unnecessary to program the integrating energy
meter or the M-Bus Slave as the system is self-
configuring.
Computer placed
at the utility
M-Bus Master
Heat meters with
M-Bus Slave

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2. M-Bus System
M-Bus system components
The M-Bus system consists of the following
elements:
M-Bus Slave
M-Bus Master
M-Bus Cascade module
M-Bus Modem
Communication software PcM-Bus
Communication software PcModem
Communication software PcLink
IR head for reading
Data cabel for reading
The M-Bus Master is built-up as a repeater, which
converts signals from e.g. RS232 to M-Bus format
(18-30 V/0-20 mA). The M-Bus Master has been
constructed to function together with Kamstrup’s
M-Bus Slaves and Kamstrup’s reading software.
The M-Bus Master can supply up to 40 M-Bus
Slaves at the power consumption of 1.5 mA
(1 Unit Load) per M-Bus Slave.
One or more M-Bus Cascade modules can be instal-
led, and can comprise up to 250 M-Bus Slaves.
Communication
The communication on the M-Bus consists of
vol-tage modulation from M-Bus Master to M-Bus
Slave (30 – 18 V) as well as current modulation
from M-Bus Slave to M-Bus Master (0 – 20 mA)
through an ordinary two-wire cable.
The M-Bus system has been constructed to observe
the regulations of the EN 1434-3.
The communication on the M-Bus system is asyn-
chronous serial bit transmission (EN 60870-5-1)
in half duplex mode, i.e. the communication con-
sists of 1 start bit, 8 data bits, 1 parity bit (even),
1 stop bit.
The transmission speeds are 300 baud or 2400
baud.
Addresses of M-Bus Slave units
If the M-Bus system is to function with a number
of connected M-Bus Slaves, each M-Bus Slave
must be given an identification number (address).
This is done via MULTICAL®, which contains a
unique customer number to the M-Bus Slave. The
unique address of the M-Bus Slave is equal to the
last 3–8 digits of the customer number, and the-
reby supports both primary and secondary addres-
sing. The address applies to both types of addres-
sing, and can be re-programmed either by means
of the hand-held terminal, MULTITERM, or the veri-
fication program of METERTOOL.
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Primary addressing
The M-Bus Slave automatically reads the energy
meter’s costumer number in connection with start
or initialisation. The address must lie between 1
and 250.
If the last three digits of the customer number
exceed 250 (e.g. 345) the first digit will be ignored
and the ID number of the M-Bus Slave will only be
determined by the two last digits (e.g. 45).
If 3 systems are available each with 250 M-Bus
Slave modules, the number system is build up as
follows:
1st. system:
The energy meters are programmed with customer
numbers from 1001 to 1250.
2nd. system:
The energy meters are programmed with customer
numbers from 2001 to 2250.
3rd. system:
The energy meters are programmed with customer
numbers from 3001 to 3250.
Secondary addressing
The M-Bus Slave automatically reads the customer
number of the energy meter during start or initiali-
zation.
The M-Bus address consists of the last 3 – 8 digits
of the customer number, extending the address
possibility to 0000 0001 – 9999 9999.
Note: Kamstrup communication software,
PcM-Bus, and Kamstrup M-Bus Master
do not support secondary addressing.
The M-Bus module does not support extended
secondary address functions, e.g. enhanced secon-
dary addressing, collision detection or wild-card
search.
Each M-Bus Slave must have its own addres
The M-Bus Master always sends a message on the
bus to a given address, which is encoded in the
message (the format). Only the M-Bus Slave in que-
stion will reply.
If several M-Bus Slaves have the same address a
collision will arise, when the M-Bus Slaves reply to
the M-Bus Master.
However, there are two special addresses, which
function as follows:
Address 254:
All M-Bus Slaves will answer to this address. The
address must solely be used in systems with only
one M-Bus Slave connected, e.g. for test.
Address 255:
No M-Bus Slave will answer to this address, but
all M-Bus Slaves will receive the message. This
message makes it possible e.g. to change the baud
rate of a whole system at a time, only by sending a
format from the M-Bus Master.

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Operation
It is optional whether the M-Bus Master is to be
permanently switched on, or the bus system is to
be switched off when not in operation (reading).
The M-Bus system cannot supply the MULTICAL®
integrating units. Only the M-Bus Slaves are sup-
plied from the M-Bus Master.
In connection with start-up the M-Bus Master will
have an initialization time of approx. 5 sec., and
the overload diode will light. After the 5 sec., the
diode will switch off and the M-Bus Master is ready.
In case the bus system is turned on constantly,
these initialization times will only appear in connec-
tion with installation. In addition, the initialization
time of M-Bus Slaves is approx. 9 sec., before data
can be acquired, and if mounted in MULTICAL®III.
However, if the M-Bus Slaves are installed in
MULTICAL®the initialization time is approx. 12 sec.
The initiation time for Kamstrup 162/382/351 Combi
is typically 7 seconds.
Rarely, a longer initiation time might be necessary
– see Appendix.

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3. M-Bus Master
Two versions of the M-Bus Master are available.
One with a display and one without, however,
they function in the same way.
The M-Bus Master is built-up with supply print,
connection print and main print.
Furthermore the bracket has room for an extra
module – see paragraph 7 and 8.
The main print is placed at the top of the case,
and except from transformator, bridge connection
and connection terminals everything is mounted
on this print.
The front plate has four light emitting diodes
with the following indications:
Power:
Indicates that the M-Bus Master is supplied
with power.
Overload:
Indicates that too much power is drawn from the
bus. I.e. either a short-circuit or too many M-Bus
Slaves connected to the M-Bus Master.
Request:
Blinks when data are sent from M-Bus Master
to M-Bus Slave.
Data:
Blinks when the M-Bus Master receives data
from a M-Bus Slave.
The M-Bus Master is no intelligent unit, but a
repeater, which converts a RS232 or an optical
format to the M-Bus format.
M-Bus format means:
From M-Bus Master to M-Bus Slave is:
mark » 30 V
space » 18 V
There has to be at least 12 VDC between mark
and space.
From M-Bus Slave to M-Bus Master is:
mark = closed current
space = closed current + approx. 17 mA.
The M-Bus Master can send and receive at 300 or
2400 baud both over the optical connection possi-
bility and over the data output in the bracket which
can be connected direct to RS232 by means of an
adapter cable.
The only difference between the two M-Bus
Masters is that M-Bus Master with a display makes
it possible to read data from all MULTICAL®heat
meters connected, and a computer for reading of
data is not necessary.
Following MULTICAL®heat meter data can be read
on the display:
1. For all heat meters
- Info code
- Energy
- Volume
- In A
- In B
- Target date
2. For each individual heat meter
- Target energy
- Target volume
- Flow temperature
- Return temperature
- ∆t, power and flow
Kamstrup M-Bus Masters can only be used with
primary addressing.
For further information – see the M-Bus Master
manual.
M-Bus Master without display
M-Bus Master with display
Ordernumbers:
M-Bus Master without display 66-98-11x-xxx
M-Bus Master with display 66-98-A1x-xxx
M-Bus Master manual 5511-185
x = module options (see paragraph 7 and 8)
xxx = Country code – is filled in by
Kamstrup A/S.

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4. M-Bus Slave for MULTICAL®
The M-Bus Slave is a module especially developed
for MULTICAL®and is easily installed in the modu-
lar space.
The M-Bus Slave is supplied via the M-Bus Master,
and there is a galvanic decoupling to MULTICAL®,
which cannot be supplied over the M-Bus Master.
The M-Bus Slave is equipped with either two
extra in- or outputs, to facilitate remote data
acquisition from other meters, e.g. water meter
or to read out the energy and volumes pulses
from the meter itself.
The M-Bus Slave is an intelligent unit with its own
processor and RAM.
The M-Bus Slave automatically collects data from
the heat meter every 12 hours. furthermore data is
collected during reset/start as well as when data
has been sent from M-Bus Slave to M-Bus Master.
Reset is produced by decoupling the supply power
to the M-Bus system for a while (at least 1 minute).
The M-Bus Slave can also be initiated from the
M-Bus Master by sending the format SND_NKE.
Initiation means resetting the internal counters
and collecting data from the meter. When the M-Bus
Slave collects current data from the meter, commu-
nication to the M-Bus network is blocked. This inter-
val is called the initiation time, for MULTICAL®III it
is typically 9 seconds, whereas the typical initiation
time of a MULTICAL®is 12 seconds.
For the creation of M-Bus data packs the M-Bus
Slave uses the codings of MULTICAL®(A-B-CCC).
If the coding cannot be found in the M-Bus Slave
an error message appears which means that the
decimal point will not be correctly placed in the
M-Bus data pack.
Each M-Bus Slave has a maximum current
consumption of 1 Unit Load (1.5 mA).
Rin = 410 Ω, Cin = 0,5 nF.
Order numbers:
M-Bus Slave for MULTICAL®III/MULTICAL®with pulse inputs 66-04-000-100
M-Bus Slave for MULTICAL®III/MULTICAL®with pulse outputs 66-07-000-100
M-Bus Slave for MULTICAL®with pulse inputs 66-08-000-100
M-Bus Slave for MULTICAL®with pulse outputs 66-09-000-100
There is a difference between the M-Bus Slaves for MULTICAL®III and MULTICAL®.
MULTICAL®transmits a larger amount of data. Please refer to paragraph 10: Data acquisition of M-Bus.
Terminal 24-25 (M-Bus) M-Bus connection
Terminal 65-66 (input A) Pulse input A
Terminal 67-68 (Input B) Pulse input B
Terminal 24-25 (M-Bus) M-Bus connection
Terminal 16-17 (CE) Energy pulse
Terminal 67-68 (CV) Volume pulse
Pulse inputs Pulse outputs

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5. M-Bus Slave for MULTICAL®Compact/MULTICAL® 401
The M-Bus Slave is a module especially developed
for MULTICAL®Compact/MULTICAL®401, and is
easily installed in the module area.
The M-Bus Slave is an intelligent unit with a
processor and RAM of its own.
The M-Bus Slave for MULTICAL®Compact/
MULTICAL®401 is identical with the one for
MULTICAL®III, except from the physical dimensions.
There are two versions of the M-Bus module:
– without pulse inputs
– with pulse inputs
Both modules can be used in MULTICAL®Compact
as well as MULTICAL®401, however, the pulse in-
puts can only be used together with MULTICAL®401.
Each M-Bus Slave has a max. power consumption
of 1 Unit Load (1.5 mA)
Rin = 410 Ω, Cin = 0,5 nF.
Data is automatically read every 12 hour, further-
more data is collected during reset/start as well
as when data has been sent from M-Bus Slave to
M-Bus Master. Reset is produced by decoupling
the supply power to the M-Bus system for a while
(at least 1 minute).
The M-Bus Slave can also be initiated from the
M-Bus Master by sending the format SND_NKE.
Initiation means resetting the internal counters
and collecting data from the meter.
When the M-Bus Slave collects current data from
the meter, communication to the M-Bus network
is blocked. This interval is called the initiation
time, for MULTICAL® Compact/MULTICAL® 401 it
is typically 9 seconds.
See Appendix for further information.
M-Bus for MULTICAL®Compact/MULTICAL®401
Terminal 24-25 (M-Bus) Connections
Terminal 65-66 (Pulse) Not in use
Display Battery
Module area Module area in MULTICAL®Compact
Order numbers:
M-Bus Slave for MULTICAL®Compact/MULTICAL®401 66-0S-000-100
M-Bus Slave for MULTICAL®Compact/MULTICAL®401 with pulse inputs 66-0S-000-200
M-Bus, pulse inputs for
MULTICAL®Compact/MULTICAL®401
Module area in MULTICAL®401
Display Battery
Module area

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6. M-Bus Slave for Kamstrup 162/382/351 Combi
The M-Bus Slave is especially developed for
Kamstrup 162/382/351 Combi, and is easily
installed in the modular space of the electricity
meter.
The M-Bus Slave for electricity meters is equipped
with a pulse input.
The physical dimensions are identical with those of
the M-Bus Slave for MULTICAL®Compact, however,
it cannot be used for a MULTICAL®Compact.
The M-Bus Slave is an intelligent unit with a proces-
sor and RAM of its own, and it automatically finds
out in which meter type it is placed.
Data is automatically read every hour, furthermore
data is collected during reset/start as well as when
data has been sent from M-Bus Slave to M-Bus
Master. Reset is produced by decoupling the supply
power to the M-Bus system for a while (at least 1
minute).
The M-Bus Slave can also be initiated from the
M-Bus Master by sending the format SND_NKE.
Initiation means resetting the internal counters
and collecting data from the meter.
When the M-Bus Slave collects current data from
the meter, communication to the M-Bus network
is blocked. This interval is called the initiation time,
and is for Kamstrup 162/382/351 COMbi typical
7 seconds.
See Appendix for further information.
The power consumption of each M-Bus Slave
is 1 Unit Load (1.5 mA).
Rin = 410 Ω, Cin = 0,5 nF.
Terminal 24-25 (M-Bus) Connections
Terminal 65-66 (Pulse) Pulse input
M-Bus Slave mounted
in an electricity meter
Order numbers:
M-Bus Slave for Kamstrup 162/382/351 Combi 6850-005

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7. M-Bus Cascade module
The M-Bus Cascade module can be used to increase
the number of M-Bus Slaves in an M-Bus network
from 40 to max. 250 M-Bus Slaves (primarily
addressing). Furthermore, the cable length can be
multiplied by six by using six M-Bus Cascade
modules mounted in M-Bus Master units.
The M-Bus Cascade module is mounted in an M-Bus
Master and needs neither set-up nor address.
The function of the M-Bus Cascade module is
to repeat communication to and from the M-Bus
Master.
A new M-Bus Master with M-Bus Cascade module
is to be connected to an already existing network
parallel to one of the connected MULTICAL®energy
meters with M-Bus Slave. From the new M-Bus
Master a new network with 38 energy meters and
1 M-Bus Cascade module or 40 M-Bus Slaves can
be established.
It is possible to connect up to 6 M-Bus Masters
and thereby increase the number of energy meters
in the network to a total of 250 meters (primarily
addressing).
Each M-Bus Cascade module has a power
consumption of 2 Unit Loads (3 mA).
Rin = 410 Ω, Cin = 0,5 nF.
Extra cable length per unit:
Max. 1.800 m to the most remote
M-Bus Slave/0.8 mm2.
M-Bus interface
(53, 54)
To this the
M-Bus Slaves
are connected.
Input A (65, 66),
Input B (67, 68).
– Are not in use.
.