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.
.

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The number of M-Bus Slave modules/cable length as a function of the number of M-Bus Cascade units
in a Kamstrup M-Bus system.
M-Bus
Master
Cascade unit =
1 Cascade module
+ 1 M-Bus Master
Total numbers of M-Bus Slaves Total cabel lenght
0,5/0,8 mm2
1 0 40 1000/1800 m
1 38 + 40 = 78 2000/3600 m
2 38 + 38 + 40 = 116 3000/5400 m
3 38 + 38 + 38 + 40 = 154 4000/7200 m
4 38 + 38 + 38 + 38 + 40 = 192 5000/9000 m
5 38 + 38 + 38 + 38 + 38 + 40 = 230 6000/10800 m
6 38 + 38 + 38 + 38 + 38 + 38 + 22 = 250 7000/12600 m
Order numbers:
M-Bus Cascade module 66-98-001-100
1 = module number

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8. M-Bus Modem
An M-Bus system of up to 40 meters can be read
via the M-Bus Modem.
The M-Bus Modem can be mounted in both M-Bus
Master without a display and M-Bus Master with
a display.
Test
1. When the modem has been installed, the line
voltage must be measured on clamps 70 and
71. It must be min. 24 VDC.
2. Remount the top of the M-Bus Master.
3. Make a forced call.
M-Bus Master without a display
Keep pressing the key for min. 10 seconds.
The modem module calls the utility at the
entered number.
M-Bus Master with display
Keep pressing both keys for min. 10 seconds,
until a “Call” appears in the display.
The modem module calls the utility at the ente-
red number.
The M-Bus Modem is read via the communication
software PcModem, but uses the same database
as PcM-Bus.
When the call has been made, we recommend you
to call the utility to ensure that the call has been re-
gistered by the system software.
Two telephone numbers are entered into the
M-Bus Modem:
Telephone number 1: The data number for
remote reading.
Telephone number 2: An alternative data num-
ber for remote reading.
Each number can contain 24 digits.
The M-Bus Modem can be programmed to make
calls directly and not via a PABX switchboard accor-
ding to the “0 - Pause - dialling tone” method.
For further information please refer to:
The M-Bus Master manual
The M-Bus Modem installation guide
The PcModem manual
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The line voltage is measured here.
Order numbers:
M-Bus Modem module 66-98-002-319
2 = module number

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9. Installation of M-Bus
An M-Bus system is mounted with bus topology,
which means that all M-Bus Slaves are coupled to
the M-Bus system in parallel. You start from the
M-Bus Master, into the first M-Bus Slave, from the
first M-Bus Slave and on to the next one etc.
The M-Bus Master has two sets of parallel termi-
nals, which makes it possible to divide the M-Bus
in two halves in order to facilitate later error detec-
tion.
The M-Bus terminals have the numbers 24 and 25.
The M-Bus is independent of polarity i.e. it is at no
consequence how the M-Bus wires are connected
to terminals 24 or 25.
A M-Bus Slave is mounted in MULTICAL®by inser-
ting the M-Bus Slave at the module place and
mounting the M-Bus cables. Before the identifi-
cation number can be entered in the M-Bus Slave,
the M-Bus Slave must be either reset or initiated.
We recommend that the whole M-Bus system is
switched off when mounting new M-Bus Slaves.
When all M-Bus Slaves have been connected,
the M-Bus system is started (the current to the
M-Bus Master is switched on). This start will reset
all M-Bus Slaves.
M-Bus Slaves can also be mounted without the
M-Bus system being switched off. This means that
SND_NKE must be sent to address 255 when all
M-Bus Slaves have been mounted in order to ini-
tiate them. Failing to do so, the connected M-Bus
Slaves will not collect their ID-numbers, so that
the M-Bus Master can contact them, until 12 hours
later.
Cable length
The cable length depends on the cable resistance
and capacity. The cable resistance depends on the
cable type and above all the cross section.
General demands:
The resistance R must be less
than 29 Ω/km.
The capacity C must be less
than 180 nF/km.
If e.g. a cable of 2 x 0.8 mm2is used, in practice
approx 1.800 m cable is used in total in the M-Bus
system based on 40 M-Bus Slaves.
In addition – see tabel on page 11
Mounting
M-Bus connection Supply
Modular space for M-Bus Modem
or M-Bus Cascade module
Introduction of M-Bus
and data cable
Serial data output line 230 VAC Introduction of 230 VAC
Botton of the M-Bus Master

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230 VAC is connected on terminals 27 and 28.
Power supply is connected on terminals 60 (+)
and 61 (-).
M-Bus is connected on terminals 24 and 25,
independent on polarity.
Serial data output:
- terminal 62 = DATA: Brown
- terminal 63 = REQUEST: White
- terminal 64 = GND: Green
For correct communication between M-Bus Master
and PC, IR head type 66-99-102 or data cable type
66-99-106 from Kamstrup must be used.
The M-Bus Slave is connected to M-Bus on termi-
nals 24 and 25. It is possible to loop the terminals.
After mounting we recommend to check the vol-
tage on terminals 60 and 61, it should be between
36 and 62 VDC. Then mount the M-Bus Master top
part, the light emitting diode designated POWER
should be constantly lighted and OVERLOAD will
be lighted for approx. 5 sec.
Now the M-Bus power can be checked on terminals
24 and 25. It is not possible, however, to do this in
the bracket itself, cables on which to measure must
be mounted and drawn through the bracket.
The control can possibly be made on a M-Bus Slave
in a MULTICAL®. The power must be between 30 and
36 VDC, if communication is made on the M-Bus.
When the M-Bus Master reads a M-Bus Slave,
REQUEST will be lighted briefly and the light emit-
ting diode DATA will be lighted short-term when
the M-Bus Slave answers.
Extra pulse inputs M-Bus connection
M-Bus Slave for MULTICAL®III/MULTICAL®
M-Bus connection Supply Serial data output
Holes 230 VAC
for cables
M-Bus Master
MULTICAL®bottom
MULTICAL®bottom
M-Bus connection
M-Bus Slave
M-Bus connection
M-Bus Slave M-Bus installation
M-Bus cable
2-wire
E.g.: 2 x 0.8 mm2
Max. 1800 m
Max. 40 M-Bus
Slave modules.

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10. Data reading of M-Bus
A Kamstrup M-Bus system is read by means of a
PcM-Bus reading programme installed on a PC.
Data is read via the M-Bus Master through the
IR-head, or via a data cable mounted in the bottom
of the M-Bus Master.
Following data message can be read:
66-04-000-100 pulse inputs MULTICAL®III/CDE
66-07-000-100 pulse outputs MULTICAL®III/CDE
66-0S-000-100 MULTICAL®Compact/401:
66-0S-000-200 pulse inputs MULTICAL®Compact/401:
- Customer ID No., TA2, TL2, TA3, TL3, InA, InB,
Prog No., Config. No., Date, Energy, Volume,
Hour counter, tforward, treturn, ∆t, Power, Flow,
Peak power or peak flow, Info Code, Target
date, Energy*, Volume*.
NB.: M-Bus Slave modules for MULTICAL®III can
be used in MULTICAL®but in such cases it will only
tranfer above data telegram. InA and InB are not
used in 66-07-000-100 or in 66-0S-000-100.
Following data message can be read:
6608-000-100 pulse inputs MULTICAL®,
66-09-000-100 pulse outputs MULTICAL®:
- Customer ID No., TA2, TL2, TA3, TL3, InA, InB,
Prog. No., Config. No., Date, Energy, Volume,
Hour counter, tforward, treturn, ∆t, Power, Flow,
Peak power or peak flow, Info Code, m3x tforward,
m3x treturn, Cooling energy, Yearly peak power,
Target date, Energy*, Volume*.
NB.: Can only be used in MULTICAL®.
InA and InB are not used in 66-09-000-100.
* Target date data
Data reading of heat meters
M-Bus Slave for MULTICAL®III/MULTICAL®
Pulse inputs
66-04-000-100
66-08-000-100
Pulse outputs
66-07-000-100
66-09-000-100
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 18-19 (CV) Volume pulse

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Data reading of Kamstrup 162/382/351 Combi
Following data telegram can be read:
162/282/382:
- Energy, Power, Operating hours, Counter value,
Peak power, Customer number, Pulse input,
Spec. data, Info Code.
351 Combi:
- Customer number, Operating hours, True
energy, Power, Peak power, Pulse input,
Spec. data, Info Code.
M-Bus Slave for Kamstrup 162/382/351 Combi
See the PcM-Bus manual for further information.
Terminal 24-25 (M-Bus) M-Bus connection
Terminal 65-66 (Pulse) Pulse input
Reading equipment
Data cable for reading IR head for reading
Data cable or IR head must be used for correct transmission of meter data between M-Bus Master and PC.
Order numbers:
M-Bus Software PcM-Bus S75-30-007
PcM-Bus manual 5511-722
IR head for reading 66-99-102
Cable for reading 66-99-106
M-Bus Slave for MULTICAL®Compact/MULTICAL®401
Terminal 24-25 (M-Bus) M-Bus connection
Terminal 65-66 (In A) Pulse input A Not in use for MULTICAL®Compact
Terminal 67–68 (In B) Pulse input B Not in use for MULTICAL®Compact
Without pulse inputs With pulse inputs

5511-710 GB/12.2004/Rev. C1
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11. Protocol
Commands
The M-Bus concept includes the possibility of
various commands from M-Bus Master to M-Bus
Slave and from M-Bus Slave to M-Bus Master.
For the Kamstrup M-Bus system certain commands
which are relevant for the communication with a
district heat meter have been chosen.
M-Bus Master to M-Bus Slave:
REQ_UD2 Collects data from
the M-Bus Slave
SND_NKE Initiates the M-Bus Slave
SND_UD1 Send data to M-Bus Slave,
e.g. new baudrate
M-Bus Slave to M-Bus Master:
RSP_UD1 Sends data to M-Bus Master
CON_ACK Acknowledgement of the receipt
of data from the M-Bus Master
The individual commands in detail
The Appendix describes all command formats.
M-Bus Master to M-Bus Slave
REQ_UD2: Collect data from M-Bus Slave
STARTCHARACTER 10H
C-FIELD 5BH
A-FIELD XXH
CHECKSUM XXH
STOPCHARACTER 16H
Startcharacter: 10H = short format
C-field: 5BH/7BH = REQ_UD2
A-field: Address of M-Bus Slave modules
Checksum: Sum of A and C field, the two least significant
Hex digits
Stopcharacter: Always 16H
Startcharacter: 10H = short format
C-field: 40H = SND_NKE
A-field: Address of M-Bus Slave modules
Checksum: Sum of A and C field, the two least significant
Hex digits
Stopcharacter: Always 16H
Startcharacter: 68H = long format
L-field: Desribes the lenght of long format
Startcharacter: 68H = long format
C-field: 53H = SND_UD1
A-field: Address of M-Bus Slave modules
CI-field: Data field, B8H = 300 baud, BBH = 2400 baud
Checksum: Sum of A, C and CI field, the two least significant
Hex digits
Stopcharacter: Always 16H
STARTCHARACTER 68H
L-FIELD 03H
L-FIELD 03H
STARTCHARACTER 68H
C-FIELD 53H
A-FIELD XXH
CI-FIELD XXH
CHECKSUM XXH
STOPCHARACTER 16H
STARTCHARACTER 10H
C-FIELD 40H
A-FIELD XXH
CHECKSUM XXH
STOPCHARACTER 16H
SND_NKE: Initiate M-Bus Slave.
SND_UD1: Data to M-Bus Slave (e.g. new baudrate).
CON_ACK: Data format from M-Bus.
Master received and accepted.
SINGLECHARACTER E5H

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M-Bus Slave to M-Bus Master
RSP_UD1: Data from heat meter to M-Bus Master.
STARTCHARACTER 68H
L-FIELD 82 or 92H
L-FIELD 82 or 92H
STARTCHARACTER 68H
C-FIELD 08H
A-FIELD XXH
CI-FIELD XXH
DATA HEAD
RECORD ENERGY
RECORD WATER
RECORD
Startcharacter: 68H = long format
L-field: Describes the lenght of long format
Startcharacter: 68H = long format
C-field: 08H = RSP_UD1
A-field: Address of M-Bus Slave module
CI-field: Data field, answer in variable structure
Checksum: Sum from C-field to last data record,
the two least significant Hex digits
ID - No
ID - No
ID - No
ID - No
TYPE A
TYPE A
TYPE A
TYPE A
MANUFAC.
MANUFAC.
00101101
00101100
GEN. METER XXH
MEDIA HEAT 04H
eller 0CH
ACCESS XXH
STATUS 00H
SIGNATURE
SIGNATURE
00H
00H
DATA HEAD
ID-no, type A
Indicates the 8 least significant digits of the
MULTICAL®number, is not used by Kamstrup.
MANUFAC: M-Bus coded manufacturer code for “KAM”.
Gen. meter: Generation of the heat meter.
Media (heat): Code for district heat meter. 04H for returnn
flow meter and 0CH for flow meter.
Access: Counts 1 every time data is sent to the
M-Bus Master.
Status: Is set by the M-Bus Slave, must be 00H for correct
data – should be checked. See also page 26.
Signature: Not used by Kamstrup.

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RSP_UD1: Data to the M-Bus Master from
Kamstrup 162/382/351 Combi.
STARTCHARACTER 68H
L-FIELD 46H
L-FIELD 46H
STARTCHARACTER 68H
C-FIELD 08H
A-FIELD XXH
CI-FIELD XXH
Startcharacter: 68H = long format
L-field: Describes the lenght of long format
Startcharacter: 68H = long format
C-field: Code for RSP_UD1
A-field: Address of M-Bus Slave module
CI-field: Data field, answer in variable structure
ID - No
ID - No
ID - No
ID - No
63 BDC
21 BDC
67 BDC
31 BDC
MANUFAC.
MANUFAC.
2DH
2CH
GEN. METER XXH
MEDIA ELEC. 02H
ACCESS XXH
STATUS 00H
SIGNATURE
SIGNATURE
00H
00H
ID-no, type A
As e.g.: costumer no. 31672163
Manufac: M-Bus coded manufacturer code for “KAM”.
Gen. meter: Generation of electricity meter
Media (el.): Code for electricity
Access: Counts 1 every time data is sent to the
M-Bus Master.
Status: Is set by M-Bus Slave. 00H for correct data.
See also page 26.
Signature: Not used by Kamstrup.
Data head
Communication process
Initialization of M-Bus network
M-Bus Master M-Bus Slave
1. SND_NKE (255), 300 baud
or 2400 baud.
All M-Bus Slaves collect new data.
No acknowledgement is sent.
2. SND_UD1 (255) 300 baud
CI = BBH (change to 2400 baud).
The M-Bus Slave changes to 2400 baud.
No acknowledgement is sent.
3. REQ_UD2 (adr) 2400 baud. Relevant M-Bus Slave answers with data.
Enters new data.
4. M-Bus Master (software)
stores no data.
RSP_UD1 2400 baud.
The M-Bus Slave answers with data.
5. The next M-Bus Slave receives a requestes
until all M-Bus Slaves have answered
Reading of data, can be up to 12 hours old:
The M-Bus network is supposed to have been initiated.
M-Bus Master M-Bus Slave
1. SND_UD1 (255) 300 baud
CI = BBH (change to 2400 baud)
The M-Bus Slave changes to 2400 baud.
No acknowledgement is sent.
2. REQ_UD2 (adr) 2400 baud. Request sendes til M-Bus Slave module.
3. M-Bus Master (software)
stores no data.
RSP_UD1 2400 baud.
The M-Bus Slave answers with data.
4. The next M-Bus Slave receives a requestes
until all M-Bus Slaves have answered

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Reading of fresh data through e.g. data logging
M-Bus Master M-Bus Slave
1. SND_NKE (255), 300 baud
or 2400 baud.
All M-Bus Slave collect new data.
No acknowledgement is sent.
Data ready in MULTICAL®III typically after
9 sec. MULTICAL®typically after 12 sec.
In Kamstrup 162/382/351 Combi data
is ready typically after 7 sec.
2. SND_UD1 (255) 300 baud
CI = BBH (change to 2400 baud).
M-Bus Slave changes to 2400 baud.
No acknowledgement is sent.
3. REQ_UD2 (adr) 2400 baud. Relevant M-Bus Slave answers with data.
Enters new data.
4. The next M-Bus Slave
receives a request until
all slaves have answered.
RSP_UD1 2400 baud.
The M-Bus Slave answers with data.
M-Bus Slave and foreign M-Bus masters
When using foreign masters and/or foreign
software, the same commands are to be used.
The M-Bus Slave only supports the above-
mentioned commands.
Is the command SND_NKE (address) used,
the M-Bus Slave will answer CON_ACK.
Is the command SND_UD1 (address) used,
the M-Bus Slave also answers CON_ACK.
Kamstrup software always uses the address 255,
which does not require an acknowledgement from
the M-Bus Slave.
The data telegram is in M-Bus format until the
“END” character 0FH, see Appendix.
The data which follows is in Kamstrup format,
which can not be decoded by foreign software/
M-Bus Masters.
The M-Bus Slave will identify itself by the manu-
facturer code “KAM”.
Appendix
1. REQ_UD2 (adr.) ¨RSP_UD1
In order to collect heat meter data from a M-Bus
Slave REQ_UD1 must be sent from the M-Bus
Master. The M-Bus Slave checks the message,
and if it is o.k., the M-Bus Slave answers
RSP_UD1 – heat meter data packed according
to the CEN standard. The collected data will al-
ways be at least 12 hours old. When RSP_UD1
has been sent from the M-Bus Slave, new data
will be collected from the heat meter. I.e. you
can acquire completely fresh data by sending
REQ_UD1 twice to the same M-Bus Slave.
As data acquisition from MULTICAL®III or
MULTICAL®means that the bus communication
is blocked, an interval of min. 9 sec. between
two REQ_UD1 to the same M-Bus Slave is re-
quired. MULTICAL®requires an interval of 12
sec. However, at rare intervals bus communi-
cation may be blocked for up to 25–30 sec.
while measurings of energy, power, flow, tem-
perature etc. are being made.
The initiation time of the electricity meter is
typically 7 sec., but at rare intervals the com-
munication may be blocked for up to 20 sec.
2. SND_NKE (adr.) ¨CON_ACK
The M-Bus Master is initiated by means of
SND_NKE, and the M-Bus Slave acknowledges
receipt of the message by means of CON_ACK.
3. SND_UD1 (adr.) ¨CON_ACK
The M-Bus Master wants to change the baud
rate of the M-Bus Slave. SND_ UD1 is sent,
and the M-Bus Slave accepts with CON_ACK.
It should be mentioned that the baud rate
cannot be changed until CON_ACK has been
transmitted.
In Rev. C1 and onwards for type 66-04-00-100
this feature is unnecessary, as the M-Bus Slave
is furnished with a built-in auto detect of the
baud rate, however, nevertheless it is imple-
mented in the M-Bus Slave. The feature is not
necessary for 66-07-000-100, 66-08-000-100,
66-09-000-100, 66-0S-000-100 and
66-0S-000-200, but is nevertheless imple-
mented.