Kamstrup M-Bus Master Installation and User Guide

Brand: Kamstrup

Model: M-Bus Master

Type: Installation and User Guide

M-Bus Mster MultiPort 250L

Instlltion nd User Guide

Kmsrup A/S · Indusrivej 28, Silling · DK-8660 Sknderborg · T: +45 89 93 10 00 · info@kmsrup.com · kmsrup.com

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M-Bus Mster MultiPort 250L

Contents

1 Introduction 3

1.1 Design 3

2 Functionlity 4

2.1 Overview of functions 6

3 Connections 7

3.1 Overview of connections 8

3.2 Power supply 9

3.3 USB 9

3.4 RS-232 12

3.5 RS-485 13

3.6 M-Bus Output 13

3.6.1 Current nd voltge 13

3.7 M-Bus Repeter Input 14

4 Cbling 15

4.1 Specil fetures of

M-Bus Mster MultiPort 250L 15

4.2 Electricl conditions in n M-Bus network 15

4.2.1 M-Bus modules 16

4.3 Instlltion prmeters 16

4.3.1 Cble 16

4.3.2 Cble topology 17

4.3.3 Exmples of network sizes 20

5 M-Bus Addressing 21

5.1 Primry ddressing 21

5.2 Secondry ddressing 21

5.3 Enhnced secondry ddressing 21

6 M-Bus communiction 22

6.1 Communiction speed 22

6.2 Trnsprent reding 22

6.3 Light Emitting Diodes 23

6.3.1 Power 23

6.3.2 Request 23

6.3.3 Dt 23

6.3.4 Overlod 23

7 Dimensioned drwings 24

8 Technicl dt 25

9 Ordering numbers 26

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M-Bus Mster MultiPort 250L

1 Introduction

M-Bus is  bus system, which is specilly suited for reding of wter, het, cooling, gs nd electricity consumption

meters.

An M-Bus system consists of n M-Bus Mster nd  number of meters with M-Bus interfce. A network cn include

different meter types nd brnds. The cble type used will typiclly be twisted pir copper.

The connected meters re red by  reding progrm which is connected to one of the mster’s communiction ports.

The mster powers the M-Bus slve modules in the meters. Bttery supplied meters thereby chieve  longer bttery

lifetime.

The mximum size of n M-Bus network using Kmstrup M-Bus Mster MultiPort 250L is 250 meters. If  number of

msters re conﬁgured s repeters nd coupled in cscde nd only secondry ddressing is used,  totl of 1,250

meters cn be connected, nd the totl cble length cn be up to pprox. 14 km.

If primry ddressing is used, up to 250 meters cn be connected.

Communiction in the M-Bus network is synchronous seril bit trnsmission in hlf duplex, which mens tht it is only

possible to communicte in one direction t  time.

Communiction speed cn be 300, 2400 or 9600 Bud.

M-Bus is stndrdized ccording to EN 13757-2 nd EN 13757-3.

1.1 Design

M-Bus Mster MultiPort 250L is built into  solid cbinet, which complies with protection clss IP 67.

The power supply is  switch mode type which enbles you to connect the mster to  power supply between 100 nd

240 Volt. The frequency must be 50-60 Hz.

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M-Bus Mster MultiPort 250L

2 Functionlity

Kmstrup M-Bus Mster MultiPort 250L is n M-Bus mster designed for the connection of up to 250 meters with

M-Bus interfce. The cble length of  mster cn be up to 2800 m depending on cble type.

The mster supports primry, secondry nd enhnced secondry ddressing.

All inputs re glvniclly seprted from the M-Bus network.

MultiPort 250L cn be ccessed from ll vilble communiction ports. The integrl port controller prevents collision

in cse of simultneous communiction through more thn one port.

When the port controller detects communiction on one port, communiction on other ports becomes impossible.

When communiction on one port is ﬁnished, ll ports re open to communiction.

The Repeter function mkes it possible to extend the size of the M-Bus network both s to number of meters nd

totl cble length. If one mster nd four repeters re instlled in  network, the totl cble length cn be extended to

pprox. 14 km nd up to 1250 meters cn be connected.

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M-Bus Mster MultiPort 250L

602

M-Bus Master M-Bus Master M-Bus Master

250 meters 250 meters 250 meters

With 4 repeters, up to 1250

meters nd 14 km cble length

M-Bus Mster

M-Bus Repeter M-Bus Repeter ......

Up to 14 km2.8 km2.8 km

RS-232, RS-485, USB

RS-232: 15 m

RS-485: 1200 m

USB: 5 m

24+25

24+2553+5424+2553+54

Four light emitting diodes indicte the sttus of mins supply, dt communiction s well s possible overlod nd

short-circuit of the M-Bus network.

Kmstrup M-Bus Mster MultiPort 250L hs been designed for instlltion indoors. The protection clss cn be up to IP

67.

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M-Bus Mster MultiPort 250L

2.1 Overview of functions

• Usble s trnsprent mster, repeter nd level converter

• Supports primry, secondry nd enhnced secondry ddressing

• Collision detection with brek signl

• Up to 250 slves per mster

• Integrted repeter function

• Up to four repeters in  system =  totl of 1250 meters

• Up to 14 km cble length

• 300, 2400, nd 9600 bud communiction speed

• Byte recovery

• Echo suppression

• Trnsient protection

• Integrted USB, RS-232 nd RS-485 with utomtic port controller

• All ports re trnsprent nd glvniclly seprted from the M-Bus network

• Cble connection vi 9 PG cble glnds

• Locl nd remote updte of ﬁrmwre for future functionlity

• Up to IP 67 protection clss.

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M-Bus Mster MultiPort 250L

3 Connections

All connections in MultiPort 250L re screw terminls with

mx. cble size of 2 mm2.

The protection clss of M-Bus Mster MultiPort 250L cn

be up to IP 67. IP 67 mens full dust protection s well

s wter tightness for minimum 30 minutes down to 1

metre.

In order to obtin the highest IP protection the cbles

used must be correctly mounted through the mster’s

unions.

USB RS-485

RS-232 4 sets of

M-Bus outputs

M-Bus input for

cscde mode

Mins

100-230 V

50/60 Hz

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M-Bus Mster MultiPort 250L

3.1 Overview of connections

Connection number on

mster

Designtion Colour/connector No. Description

Power supply

134 N Blue Neutrl

135 L Brown Live

136 PE Yellow/green Protective erth

USB 2.0 Mx. recommended cble length: 5 m

130 VCC Red/1 5 V power supply

131 D- White/2 Dt -

132 D+ Green/3 Dt +

133 GND Blck/4 Ground

RS-232 Mx. recommended cble length: 15 m

105 RxD 2 Received Dt

106 TxD 3 Trnsmitted Dt

107 GND 5 Ground

108 DTR 4Dt Terminl Redy

109 CTS 8 Cler To Send

111 DSR 6 Dt Set Redy

112 RTS 7Request To Send

RS-485 Mx. recommended cble length: 1,200 m

137 A/- Trnsmit/Receive inverted

138 A+ Trnsmit/Receive non-inverted

139 GND Ground

M-Bus Repeter Input Jumper must be set to Repeter

53 L1 M-Bus input to mster in repeter mode

54 L2 M-Bus input to mster in repeter mode

M-Bus Mster Output 4 sets connection terminls, connection in prllel

24 L1 M-Bus output from mster to meters

25 L2 M-Bus output from mster to meters

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M-Bus Mster MultiPort 250L

3.2 Power supply

The power supply of M-Bus Mster MultiPort 250L is the switch mode type which requires voltge between 100 V nd

240 V. The frequency cn be 50 Hz or 60 Hz.

The mins cble is connected to the mster through the ssocited glnd. The dimeter must be between 4 nd 8 mm.

The mster is supplied without mins cble nd we recommend  ﬁxed instlltion, i.e. without using  mins plug s

this would reduce relibility of opertion.

3.3 USB

M-Bus Mster MultiPort 250L’s USB-connection cn be used for M-Bus communiction on n equl bsis with the other

seril connections.

The following communiction speeds cn be used for M-Bus communiction:

• 300 Bud 8E1

• 2400 Bud 8E1

• 9600 Bud 8E1

USB version 2.0, which llows up to 5 m cble length, is used. In connection with other USB versions thn 2.0 the

mximum cble length recommended is 3 m.

The mster’s integrted port controller mkes sure tht communiction is only possible on one seril port t  time.

The mster is vilble with  fctory-mounted 145 cm cble ﬁtted with  USB connector type A.

1 2 3 4

USB connector type A

To be ble to communicte with M-Bus Mster MultiPort 250L vi USB the corresponding USB driver must be instlled

on the computer used for reding.

The progrm is vilble on Kmstrup’s home pge.

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M-Bus Mster MultiPort 250L

When selecting Run, the instlltion progrm strts utomticlly.

When the progrm is retrieved, it is sved under C:\Kmstrup\M-Bus Mster 250L.

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M-Bus Mster MultiPort 250L

Select s shown below in order to instll the progrm.

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M-Bus Mster MultiPort 250L

3.4 RS-232

M-Bus Mster MultiPort 250L’s RS-232-connection cn be used for M-Bus communiction on n equl bsis with the

other seril connections.

The following communiction speeds cn be used for M-Bus communiction:

• 300 Bud 8E1

• 2400 Bud 8E1

• 9600 Bud 8E1

Mximum recommended cble length is 15 m.

The mster’s integrted port controller mkes sure tht communiction is only possible on one seril port t  time.

The mster is vilble with  fctory-mounted 145 cm RS-232 cble ﬁtted with  DB9F femle connector.

RS-232 connector type DB9F

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M-Bus Mster MultiPort 250L

3.5 RS-485

M-Bus Mster MultiPort 250L’s RS-485-connection cn be used for M-Bus communiction on n equl bsis with the

other seril connections.

The following communiction speeds cn be used for M-Bus communiction:

• 300 Bud 8E1

• 2400 Bud 8E1

• 9600 Bud 8E1

Mximum recommended cble length is 1,200 m.

The mster’s integrted port controller mkes sure tht communiction is only possible on one seril port t  time.

3.6 M-Bus Output

All meters in n M-Bus network re connected to M-Bus Output terminls 24 nd 25. The mster includes four sets of

connections coupled in prllel.

3.6.1 Current nd voltge

Bus mrk/spce 41 V DC/28 V DC

Detection level, communiction 7 mA

Detection level, collision 25 mA

Mx. norml operting current 375 mA

Wrning level, operting current 377 mA - Overlod LED ﬂshes

Overlod level, operting current 500 mA - Overlod LED is constntly illuminted

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M-Bus Mster MultiPort 250L

3.7 M-Bus Repeter Input

Kmstrup M-Bus Mster MultiPort 250L cn be used s

both mster nd repeter.

Used s mster, up to 250 meters cn be connected in

n M-Bus system.

The Repeter function mkes it possible to extend the

size of the M-Bus network both s to number of meters

nd totl cble length. If one mster nd four repeters

re instlled in  network, the totl cble length cn be

extended to pprox. 14 km, nd up to 1250 meters cn be

connected.

The mster is conﬁgured s repeter by plcing the

jumper on the connector mrked Repeter. Using n

M-Bus Mster MultiPort 250L s  repeter the M-Bus

network in front of the repeter is connected to ”M-Bus

Repeter In” on terminls 53 nd 54. The following meters

re connected to M-Bus Out on terminls 24 nd 25.

Position of mster/repeter jumper.

Setting s mster or repeter

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M-Bus Mster MultiPort 250L

4 Cbling

Typiclly unshielded twisted pir cble up to pprox. 1.5 mm2 is used. The cbling topology is typiclly str or bus or 

combintion of both. The connection in M-Bus is independent of polrity nd no termintion resistnce t the end of

the cbling is needed.

If  cble type with shield is used, it is importnt tht the two M-Bus conductors re not connected to ground or shield.

No precise indiction s to mximum cble length in n M-Bus network cn be given s it depends on vrious

prmeters.

The two most importnt prmeters to consider when selecting cble for n M-Bus instlltion re cble resistnce

nd cble cpcity. Generlly speking the resistnce limits the number of M-Bus slves, nd the cpcity limits the

communiction speed.

Furthermore, we recommend keeping  certin distnce between M-Bus cbles nd other cbles in order to minimize

noise from high-power electric mchinery.

4.1 Specil fetures of M-Bus Mster MultiPort 250L

M-Bus Mster MultiPort 250L hs been designed with the newest cble driver technology, nd is, therefore, rther

insensitive to the cpcity of the M-Bus network.

Thus, designing n M-Bus network to be used together with M-Bus Mster MultiPort 250L the limiting fctor s to

possible cble length will primrily be the cble resistnce in the network.

4.2 Electricl conditions in n M-Bus network

According to EN 13757-2, the mximum output voltge from n M-Bus Mster must not exceed 42 V. The output voltge

from M-Bus Mster MultiPort 250L is 41 V.

• If the voltge mesured over terminls 24-25 is 24 V or more t the most distnt meter, there is  high degree of

certinty tht ll meters cn be red

• If the voltge is between 20 nd 24 V, it will probbly be possible to red ll meters

• If the voltge is between 18 nd 20 V, the meter my be red

• If the voltge is below 18 V it is most likely tht the meter cnnot be red.

There must be no communiction on the M-Bus network when the bove mesurement is mde.

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M-Bus Mster MultiPort 250L

4.2.1 M-Bus modules

Ech M-Bus module lods the M-Bus network too. According to the stndrd, n M-Bus module should lod the

network with 1 unit lod (UL) corresponding to 1.5 mA. Some modules, however, lod with up to 4 UL.

Cpcitively the lod of n M-Bus module is 0.5 – 1 nF.

4.3 Instlltion prmeters

The following prmeters re essentil to the possible cble length of n M-Bus network.

4.3.1 Cble

The cble resistnce nd cpcity must be s low s possible. The thicker the cble, the lower the resistnce. The

thicker the cble, the higher the cpcity.

An M-Bus cble must minimum be ble to hndle 50 V nd 500 mA.

Dimeter (mm ø) Cross section (mm2)Resistnce in Ohm per 1,000

metres Length in metres per Ohm

0.5 0.20 90 11

0.65 0.33 53 19

0.8 0.50 35 29

1.0 0.79 23 45

1.13 1.00 18 57

1.26 1.25 14 71

1.39 1.52 12 87

1.6 2.0 8.7 115

Exmples of resistnce in copper cble.

Plese note tht the resistnce in copper depends on its purity. The purer the copper, the lower its resistnce.

LiYY 2x0.34 mm22x0.50 mm22x0.75 mm22x1.0 mm22x1.5 mm2

Current lod Mx. 4.5 A Mx. 6 A Mx. 10 A Mx. 12 A Mx. 18 A

Cble resistnce 56 /km 39 /km 26 /km 20 /km 12 /km

Cpcity 110 nF/km 120 nF/km 120 nF/km 120 nF/km 120 nF/km

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M-Bus Mster MultiPort 250L

J-Y(St)YY 2x0.60 mm22x0.80 mm2

Current lod - -

Cble resistnce 65 /km 37 /km

Cpcity 120 nF/km 100 nF/km

Exmples of cble types

In big networks using secondry ddressing worst cse

lod must be considered s 250 slves of 1 UL (Unit Lod)

ech cn drw 5.4 A, which thin cbles will not be ble to

withstnd.

Plese note tht resistnce cn be stted in two different

wys in cble speciﬁctions; i.e. s cble resistnce or s

loop resistnce.

Loop resistnce is the totl resistnce mesured through

the two conductors. Cble resistnce is the resistnce

through one conductor. Therefore, loop resistnce is

lwys twice the cble resistnce.

Mesurement of loop resistnce.

Mesurement of cble resistnce.

4.3.2 Cble topology

An M-Bus network normlly uses bus or str topology, or  combintion of both.

The dvntge of bus topology is shorter wires. The disdvntge is tht  cble interrupt will men tht ll the

following meters cn no longer be red.

The dvntge of str topology is the fct tht ll the other meters cn still be red fter  cble interrupt. The

disdvntge is  lrge consumption of cble with  high leding lod, which reduces the mximum cble length nd

mkes  reduction of communiction speed necessry respectively.

Bus topology offers two solutions, one looping the cble through ech meter. This solution presupposes tht there

is room for two cbles nd tht the connection terminls re prepred for the connection of two sets of cbles. All

connections re thereby typiclly mde inside the meter.

Using bus topology with ech individul meter connected to the bus,  number of connections must be estblished on

the bus itself.

18 Kmstrup A/S • 55121391_C2_GB_03.2018

M-Bus Mster MultiPort 250L

602602602602602

M-Bus Master

Bus topology with cble looped through meters.

602602602602602

M-Bus Master

Bus topology with ech individul meter connected to the bus.

602

M-Bus Master

Str topology connecting ech individul meter direct to the M-Bus Mster.

19Kmstrup A/S • 55121391_C2_GB_03.2018

M-Bus Mster MultiPort 250L

602602602602602

M-Bus Master M-Bus Master

602602

M-Bus Mster M-Bus Repeter

24-25 24-25 53-54 24-25

1st ﬂoor

2nd ﬂoor

3rd ﬂoor

4th ﬂoor

Are 1

Are 2 Are 4

Are 3

Junction box

Exmple of the construction of  lrge M-Bus network.

Dividing the connected meters into severl seprte cble networks nd connecting those individully to the Mster

will simplify troubleshooting.

20 Kmstrup A/S • 55121391_C2_GB_03.2018

M-Bus Mster MultiPort 250L

4.3.3 Exmples of network sizes

The below-mentioned tbles show exmples of possible network sizes with different cble conﬁgurtions. Ech

connected repeter increses the possible cble length by the below-mentioned lengths.

Cble type 0.34 mm2 (56 Ohm/110 nF)

Speed / Number of meters 10 50 150 250

300 Bud 10,000 m 2,000 m 700 m 400 m

2400 Bud 4,000 m 2,000 m 700 m 400 m

9600 Bud 2,000 m 2,000 m 700 m 400 m

Possible cble lengths with ll meters plced t the end of the cble network.

Speed / Number of meters 10 50 150 250

300 Bud 10,000 m 3,500 m 1,200 m 700 m

2400 Bud 7,000 m 3,500 m 1,200 m 700 m

9600 Bud 3,500 m 3,500 m 1,200 m 700 m

Possible cble lengths with meters evenly distributed in the cble network.

Cble type 1.5 mm2 (12 Ohm/110 nF)

Speed / Number of meters 10 50 150 250

300 Bud 10,000 m 8,000 m 2,800 m 1,600 m

2400 Bud 10,000 m 8,000 m 2,800 m 1,600 m

9600 Bud 3,500 m 3,500 m 2,800 m 1,600 m

Possible cble lengths with ll meters plced t the end of the cble network.

Speed / Number of meters 10 50 150 250

300 Bud 10,000 m 10,000 m 4,800 m 2,800 m

2400 Bud 10,000 m 10,000 m 4,800 m 2,800 m

9600 Bud 6,500 m 6,500 m 4,800 m 2,800 m

Possible cble lengths with meters evenly distributed in the cble network.

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Kamstrup M-Bus Master Installation and User Guide

Brand: Kamstrup

Model: M-Bus Master

Type: Installation and User Guide

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Kamstrup M-Bus Master Installation and User Guide

Kamstrup M-Bus Master Installation and User Guide

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