The M-Bus: A Documentation


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8 Appendix

8.1 Alarm Protocol

The formerly described method for an alarm protocol (see diploma work of Andreas Steffens "Eigenschaften und Anwendungen des M-Bus") was based on time slices for each of the maximum 64 alarm devices. This alarm protocol has not been standardized.

We now suggest to return to standard alarm protocol which conforms to the standard IEC 870-2:

The master software polls the maximum 250 alarm devices by requesting time critical data (REQ_UD1 to adresses 1 .. 250). A slave can transmit either a single character acknowledgement E5h signalling no alarm or a RSP_UD with the CI-Field 71h to report an alarm state.

 

68h

04h

04h

68h

08h

Adr

71h

Alarm State

CS

16h

Fig. 34 Telegram for an Alarm-Respond

 

The alarm state is coded with data type D (boolean, in this case 8 bit). Set bits signal alarm bits or alarm codes. The meaning of these bits is manufacturer specific.

 

The timeout for time critical communication must be set to 11..33 bit periods to ensure a fast poll of all alarm devices. With a baudrate of 9600 Bd and all 250 slaves reporting an alarm just in time before a timeout occurs each slave will be polled in periods of maximum 5.5 seconds. This seems to be fast enough for alarms in building control systems and other applications. For faster alarm systems the number of alarm sensors could be limited to 63 (reducing the worst case overall signal delay to less than 1.5 sec or increase the transmission speed to 38400 Bd (with the new repeater hardware) and achieve the same speed for up to 250 devices.

The functionality of the FCB- and FCV-Bit should be fully implemented in this alarm protocol to ensure that one-time alarms are safely transmitted to the master. If the slave has reported an one-time alarm and the next REQ_UD1 has a toggled FCB (with FCV=1) the slave will answer with an E5h signalling no alarm. Otherwise it will repeat the last alarm frame to avoid that the alarm message gets lost.

 

This new alarm protocol has the advantages of being standardized in IEC 870-2, simple implementation in slaves and master, fast poll cycles and using almost (with the exception of shorter timeout) the normal protocol. In addition it is allowed under EN1434-3 which allows all other types of communication of IEC-870-5-2.

 

8.2 Coding of Data Records

 

The standard IEC 870-5-4 defines the following data types for usage inside the application layer:

 

Type A = Unsigned Integer BCD := XUI4 [1 to 4] <0 to 9 BCD>

 

27

26

25

24

23

22

21

20

 

digit 10

digit 1

1UI4 [1 to 4] <0 to 9 BCD> := digit 100

8

4

2

1

8

4

2

1

2UI4 [5 to 8] <0 to 9 BCD> := digit 101

...

...

...

...

...

...

...

...

...

8

4

2

1

8

4

2

1

XUI4 [5 to 8] <0 to 9 BCD> := digit 10X-1

 

 

Type B = Binary Integer := I[1..X] <-2X-1 to +2X-1-1>

 

27

26

25

24

23

22

21

20

1B1 [X] := S=Sign: S<0> := positive

...

           

...

S<1> := negative

S

2X-2

         

2X-8

negative values in twos complement

 

 

Type C = Unsigned Integer := UI[1 to X] <0 to 2X-1>

 

27

26

25

24

23

22

21

20

UI8 [1 to 8] <0 to 255>

...

           

...

 

2X-1

           

2X-8

 

 

 

Type D = Boolean (1 bit binary information) := XB1 B1[i] <0 to 1>

 

27

26

25

24

23

22

21

20

XB1: B1[i] <0 to 1>

...

           

...

B1[i] <0> := false

2X-1

           

2X-8

B1[i] <1> := true

 

 

 

 

Type E = Compound CP16 (types and units information)

 

27

26

25

24

23

22

21

20

1UI6[1 to 6] <0 to 63> := physical unit 1

215

214

213

212

211

210

29

28

1UI6[9 to 14] <0 to 63> := physical unit 2

               

1UI4[7,8,15,16] <0 to 15> := measured media

 

 

The following data types can only be used with the variable data structure:

 

Type F = Compound CP32: Date and Time

 

 

 

 

 

27

26

25

24

23

22

21

20

215

214

213

212

211

210

29

28

223

222

221

220

219

218

217

216

231

230

229

228

227

226

225

224

 

 

 

 

 

 

 

Type G: Compound CP16: Date

 

27

26

25

24

23

22

21

20

day:

UI5 [1 to 5] <1 to 31>

215

214

213

212

211

210

29

28

month:

UI4 [9 to 12] <1 to 12>

               

year:

UI7[6 to 8,13 to 16] <0 to 99>

 

 

Type H: Floating point according to IEEE-standard

 

"Short floating Point Number IEEE STD 754" = R32IEEESTD754

R32IEEESTD754 := R32.23 {Fraction, Exponent, Sign}

 

Fraction = F := UI23 [1to 23] <0 to 1-2-23>

Exponent = E := UI8 [24 to 31] <0 to 255>

Sign = S := BS1 [32] S<0> = positive

S <1> = negative

 

F <0> and E <0> := (-1) S * 0 = ± zero

F <¹ 0> and E <0> := (-1) S * 2E-126(0.F) = denormalized numbers

E <1 to 254> := (-1) S * 2E-127(1.F) = normalized numbers

F <0> and E <255> := (-1) S * ¥ = ± infinite

F <¹ 0> and E <255> := NaN = not a number, regardless of S

 

 

bits

8

7

6

5

4

3

2

1

octet 1

F = Fraction

 

2-16

2-17

2-18

2-19

2-20

2-21

2-22

2-23

octet 2

F = Fraction

 

2-8

2-9

2-10

2-11

2-12

2-13

2-14

2-15

octet 3

E (LSB)

F = Fraction

 

2-0

2-1

2-2

2-3

2-4

2-5

2-6

2-7

octet 4

Sign

E = Exponent

 

S

27

26

25

24

23

22

21

 

 

The following ranges are specified by IEE Std 754-1985 for floating point arithmetics:

 

Range: (-2128 + 2104) to (+2128 - 2104), that is -3.4* 1038 to +3.4*1038

smallest negative number: -2-149, that is: -1.4* 10-45

smallest positive number: +2-149, that is: + 1.4* 10-45

 

8.3 Tables for Fixed Data Structure

8.3.1 Measured Medium Fixed Structure

 

Value

Field Medium/Unit

Medium

hexadecimal

Bit 16

Bit 15

Bit 8

Bit 7

 

0

0

0

0

0

Other

1

0

0

0

1

Oil

2

0

0

1

0

Electricity

3

0

0

1

1

Gas

4

0

1

0

0

Heat

5

0

1

0

1

Steam

6

0

1

1

0

Hot Water

7

0

1

1

1

Water

8

1

0

0

0

H.C.A.

9

1

0

0

1

Reserved

A

1

0

1

0

Gas Mode 2

B

1

0

1

1

Heat Mode 2

C

1

1

0

0

Hot Water Mode 2

D

1

1

0

1

Water Mode 2

E

1

1

1

0

H.C.A. Mode 2

F

1

1

1

1

Reserved

 

 

Notes:

1. Record Medium/Unit is always least significant byte first.

2. H.C.A. = Heat Cost Allocator

3. Media from "Gas Mode2" to "H.C.A. Mode2" are defined additionally to EN1434-3 for some existing meters with CI-Field 73h (intentionally mode1), which transmit the multibyte records with high byte first in contrast to the CI-Field. The master must know that these media codes mean mode 2 or high byte first. Further use of these codes for "pseudo media" is not allowed for new developments.

 

8.3.2 Table of Physical Units

 

 

Unit

 

MSB..LSB

Hex code share

Byte 7/8

 

Unit

 

MSB..LSB

Hex code share

Byte 7/8

h,m,s

 

000000

00

MJ/h

 

100000

20

D,M,Y

 

000001

01

MJ/h

* 10

100001

21

Wh

 

000010

02

MJ/h

* 100

100010

22

Wh

* 10

000011

03

GJ/h

 

100011

23

Wh

* 100

000100

04

GJ/h

* 10

100100

24

kWh

 

000101

05

GJ/h

* 100

100101

25

kWh

* 10

000110

06

ml

 

100110

26

kWh

* 100

000111

07

ml

* 10

100111

27

MWh

 

001000

08

ml

* 100

101000

28

MWh

* 10

001001

09

l

 

101001

29

MWh

* 100

001010

0A

l

* 10

101010

2A

kJ

 

001011

0B

l

* 100

101011

2B

kJ

* 10

001100

0C

m3

 

101100

2C

kJ

* 100

001101

0D

m3

* 10

101101

2D

MJ

 

001110

0E

m3

* 100

101110

2E

MJ

* 10

001111

0F

ml/h

 

101111

2F

MJ

* 100

010000

10

ml/h

* 10

110000

30

GJ

 

010001

11

ml/h

* 100

110001

31

GJ

* 10

010010

12

l/h

 

110010

32

GJ

* 100

010011

13

l/h

* 10

110011

33

W

 

010100

14

l/h

* 100

110100

34

W

* 10

010101

15

m3/h

 

110101

35

W

* 100

010110

16

m3/h

* 10

110110

36

kW

 

010111

17

m3/h

* 100

110111

37

kW

* 10

011000

18

C

* 10-3

111000

38

kW

* 100

011001

19

units

for HCA

111001

39

MW

 

011010

1A

reserved

 

111010

3A

MW

* 10

011011

1B

reserved

 

111011

3B

MW

* 100

011100

1C

reserved

 

111100

3C

kJ/h

 

011101

1D

reserved

 

111101

3D

kJ/h

* 10

011110

1E

same but

historic

111110

3E

kJ/h

* 100

011111

1F

without

units

111111

3F

8.4 Tables for Variable Data Structure

8.4.1 Measured Medium Variable Structure

 

 

Medium

Code bin.

Bit 7 .. 0

Code hex.

Other

0000 0000

00

Oil

0000 0001

01

Electricity

0000 0010

02

Gas

0000 0011

03

Heat (Volume measured at return temperature: outlet)

0000 0100

04

Steam

0000 0101

05

Hot Water

0000 0110

06

Water

0000 0111

07

Heat Cost Allocator.

0000 1000

08

Compressed Air

0000 1001

09

Cooling load meter (Volume measured at return temperature: outlet) §

0000 1010

0A

Cooling load meter (Volume measured at flow temperature: inlet) §

0000 1011

0B

Heat (Volume measured at flow temperature: inlet)

0000 1100

0C

Heat / Cooling load meter §

0000 1101

OD

Bus / System

0000 1110

0E

Unknown Medium

0000 1111

0F

Reserved

..........

10 to 15

Cold Water

0001 0110

16

Dual Water

0001 0111

17

Pressure

0001 1000

18

A/D Converter

0001 1001

19

Reserved

..........

20 to FF

 

 

8.4.2 Data Field Codes

 

Length in Bit

Code

Meaning

Code

Meaning

0

0000

No data

1000

Selection for Readout

8

0001

8 Bit Integer

1001

2 digit BCD

16

0010

16 Bit Integer

1010

4 digit BCD

24

0011

24 Bit Integer

1011

6 digit BCD

32

0100

32 Bit Integer

1100

8 digit BCD

32 / N

0101

32 Bit Real

1101

variable length

48

0110

48 Bit Integer

1110

12 digit BCD

64

0111

64 Bit Integer

1111

Special Functions

Variable Length:

With data field = `1101b` several data types with variable length can be used. The length of the data is given with the first byte of data, which is here called LVAR.

LVAR = 00h .. BFh : ASCII string with LVAR characters

LVAR = C0h .. CFh : positive BCD number with (LVAR - C0h) · 2 digits

LVAR = D0h .. DFH : negative BCD number with (LVAR - D0h) · 2 digits

LVAR = E0h .. EFh : binary number with (LVAR - E0h) bytes

LVAR = F0h .. FAh : floating point number with (LVAR - F0h) bytes [to be defined]

LVAR = FBh .. FFh : Reserved

 

Special Functions (data field = 1111b):

 

DIF

Function

0Fh

Start of manufacturer specific data structures to end of user data

1Fh

Same meaning as DIF = 0Fh + More records follow in next telegram

2Fh

Idle Filler (not to be interpreted), following byte = DIF

3Fh..6Fh

Reserved

7Fh

Global readout request (all storage#, units, tariffs, function fields)

 

 

 

8.4.3 Codes for Value Information Field (VIF)

The first block of the table contains integral values, the second typically averaged values, the third typically instantaneous values and the fourth block contains parameters (E: extension bit).

 

Coding

Description

Range Coding

Range

E000 0nnn

Energy

10(nnn-3) Wh

0.001Wh to 10000Wh

E000 1nnn

Energy

10(nnn) J

0.001kJ to 10000kJ

E001 0nnn

Volume

10(nnn-6) m3

0.001l to 10000l

E001 1nnn

Mass

10(nnn-3) kg

0.001kg to 10000kg

E010 00nn

On Time

nn = 00 seconds

nn = 01 minutes

nn = 10 hours

nn = 11 days

E010 01nn

Operating Time

coded like OnTime

E010 1nnn

Power

10(nnn-3) W

0.001W to 10000W

E011 0nnn

Power

10(nnn) J/h

0.001kJ/h to 10000kJ/h

E011 1nnn

Volume Flow

10(nnn-6) m3/h

0.001l/h to 10000l/h

E100 0nnn

Volume Flow ext.

10(nnn-7) m3/min

0.0001l/min to 1000l/min

E100 1nnn

Volume Flow ext.

10(nnn-9) m3/s

0.001ml/s to 10000ml/s

E101 0nnn

Mass flow

10(nnn-3) kg/h

0.001kg/h to 10000kg/h

E101 10nn

Flow Temperature

10(nn-3) C

0.001C to 1C

E101 11nn

Return Temperature

10(nn-3) C

0.001C to 1C

E110 00nn

Temperature Difference

10(nn-3) K

1mK to 1000mK

E110 01nn

External Temperature

10(nn-3) C

0.001C to 1C

E110 10nn

Pressure

10(nn-3) bar

1mbar to 1000mbar

E110 110n

Time Point

n = 0 date

n = 1 time & date

data type G

data type F

 

data type F

E110 1110

Units for H.C.A.

dimensionless

E110 1111

Reserved

E111 00nn

Averaging Duration

coded like OnTime

E111 01nn

Actuality Duration

coded like OnTime

E111 1000

Fabrication No

E111 1001

(Enhanced) Identification

see chapter 6.4.2 §

E111 1010

Bus Address

data type C (x=8)

 

 

VIF-Codes for special purposes:

 

Coding

Description

Purpose

1111 1011

Extension of VIF-codes

true VIF is given in the first VIFE and is coded using

table 8.4.4 b) (128 new VIF-Codes)

E111 1100

VIF in following string

(length in first byte)

allows user definable VIFs (in plain ASCII-String) *

1111 1101

Extension of VIF-codes

true VIF is given in the first VIFE and is coded using

table 8.4.4 a) (128 new VIF-Codes)

E111 1110

Any VIF

used for readout selection of all VIFs

(see chapter 6.4.3 )

E111 1111

Manufacturer Specific

VIFEs and data of this block are manufacturer specific

 

Note:

* Coding the VIF in an ASCII-String in combination with the data in an ASCII-String (datafield in DIF = 1101 b) allows the representation of data in a free user defined form.

 

8.4.4 Extension of primary VIF-Codes

If the VIF contains an extension indicator (VIF = $FD or $FB) the true VIF is contained in the first VIFE.

a) Codes used with extension indicator $FD

 

Coding

Description

Group

E000 00nn

Credit of 10nn-3 of the nominal local legal currency units

Currency Units

E000 01nn

Debit of 10nn-3 of the nominal local legal currency units

 

E000 1000

Access Number (transmission count)

 

E000 1001

Medium (as in fixed header)

 

E000 1010

Manufacturer (as in fixed header)

 

E000 1011

Parameter set identification

Enhanced Identification

E000 1100

Model / Version

 

E000 1101

Hardware version #

 

E000 1110

Firmware version #

 

E000 1111

Software version #

 

E001 0000

Customer location

 

E001 0001

Customer

 

E001 0010

Access Code User

 

E001 0011

Access Code Operator

Implementation of all

E001 0100

Access Code System Operator

TC294 WG1 requirements

E001 0101

Access Code Developer

(improved selection ..)

E001 0110

Password

 

E001 0111

Error flags (binary)

 

E001 1000

Error mask

 

E001 1001

Reserved

 

E001 1010

Digital Output (binary)

 

E001 1011

Digital Input (binary)

 

E001 1100

Baudrate [Baud]

 

E001 1101

response delay time [bittimes]

 

E001 1110

Retry

 

E001 1111

Reserved

 

 

 

 

 

Coding

Description

Group

E010 0000

First storage # for cyclic storage

 

E010 0001

Last storage # for cyclic storage

 

E010 0010

Size of storage block

 

E010 0011

Reserved

 

E010 01nn

Storage interval [sec(s)..day(s)] Œ

Enhanced storage

E010 1000

Storage interval month(s)

management

E010 1001

Storage interval year(s)

 

E010 1010

Reserved

 

E010 1011

Reserved

 

E010 11nn

Duration since last readout [sec(s)..day(s)] Œ

 

E011 0000

Start (date/time) of tariff 

 

E011 00nn

Duration of tariff (nn=01 ..11: min to days)

 

E011 01nn

Period of tariff [sec(s) to day(s)] Œ

 

E011 1000

Period of tariff months(s)

Enhanced tariff

E011 1001

Period of tariff year(s)

management

E011 1010

dimensionless / no VIF

 

E011 1011

Reserved

 

E011 11xx

Reserved

 

E100 nnnn

10nnnn-9 Volts

electrical units

E101 nnnn

10nnnn-12 A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Coding

Description

Group

E110 0000

Reset counter

 

E110 0001

Cumulation counter

 

E110 0010

Control signal

 

E110 0011

Day of week

 

E110 0100

Week number

 

E110 0101

Time point of day change

 

E110 0110

State of parameter activation

 

E110 0111

Special supplier information

 

E110 10pp

Duration since last cumulation [hour(s)..years(s)]Ž

 

E110 11pp

Operating time battery

[hour(s)..years(s)]Ž

 

E111 0000

Date and time of battery change

 

E111 0001

to

E111 1111

 

Reserved

 

 

Notes:

Πnn = 00 second(s)

01 minute(s)

10 hour(s)

11 day(s)

 The information about usage of data type F (date and time) or data type G (date) can be derived from the datafield (0010b: type G / 0100: type F).

 

Ž pp = 00 hour(s)

01 day(s)

10 month(s)

11 year(s)

 

 

 

 

 

 

 

 

 

 

b) Codes used with extension indicator $FB

 

Coding

Description

Range Coding

Range

E000 000n

Energy

10(n-1) MWh

0.1MWh to 1MWh

E000 001n

Reserved

   

E000 01nn

Reserved

   

E000 100n

Energy

10(n-1) GJ

0.1GJ to 1GJ

E000 101n

Reserved

   

E000 11nn

Reserved

   

E001 000n

Volume

10(n+2) m3

100m3 to 1000m3

E001 001n

Reserved

   

E001 01nn

Reserved

   

E001 100n

Mass

10(n+2) t

100t to 1000t

E001 1010 to

E010 0000

Reserved

   

E010 0001

Volume §

0,1 feet^3

 

E010 0010

Volume §

0,1 american gallon

 

E010 0011

Volume

1 american gallon

 

E010 0100

Volume flow §

0,001 american gallon/min

 

E010 0101

Volume flow

1 american gallon/min

 

E010 0110

Volume flow

1 american gallon/h

 

E010 0111

Reserved

   

E010 100n

Power

10(n-1) MW

0.1MW to 1MW

E010 101n

Reserved

   

E010 11nn

Reserved

   

E011 000n

Power

10(n-1) GJ/h

0.1GJ/h to 1GJ/h

E011 0010 to

E101 0111

Reserved

   

E101 10nn

Flow Temperature

10(nn-3) F

0.001F to 1F

E101 11nn

Return Temperature

10(nn-3) F

0.001F to 1F

E110 00nn

Temperature Difference

10(nn-3) F

0.001F to 1F

E110 01nn

External Temperature

10(nn-3) F

0.001F to 1F

E110 1nnn

Reserved

   

E111 00nn

Cold / Warm Temperature Limit

10(nn-3) F

0.001F to 1F

E111 01nn

Cold / Warm Temperature Limit

10(nn-3) C

0.001C to 1C

E111 1nnn

cumul. count max power §

10(nnn-3) W

0.001W to 10000W

 

8.4.5 Codes for Value Information Field Extension (VIFE)

The following values for VIFEs are defined for an enhancement of VIFs other than $FD and $FB:

 

VIFE-Code

Description

E00x xxxx

Reserved for object actions (master to slave): see table on page 75

or for error codes (slave to master): see table on page 74

E010 0000

per second

E010 0001

per minute

E010 0010

per hour

E010 0011

per day

E010 0100

per week

E010 0101

per month

E010 0110

per year

E010 0111

per revolution / measurement

E010 100p

increment per input pulse on input channel #p

E010 101p

increment per output pulse on output channel #p

E010 1100

per liter

E010 1101

per m3

E010 1110

per kg

E010 1111

per K (Kelvin)

E011 0000

per kWh

E011 0001

per GJ

E011 0010

per kW

E011 0011

per (K*l) (Kelvin*liter)

E011 0100

per V (Volt)

E011 0101

per A (Ampere)

E011 0110

multiplied by sek

E011 0111

multiplied by sek / V

E011 1000

multiplied by sek / A

E011 1001

start date(/time) of Œ 

E011 1010

VIF contains uncorrected unit instead of corrected unit

E011 1011

Accumulation only if positive contributions

E011 1100

Accumulation of abs value only if negative contributions

E011 1101 to

E011 1111

Reserved

 

 

VIFE-Code

Description

E100 u000

u=1: upper, u=0: lower limit value

E100 u001

# of exceeds of lower u=0) / upper (U=1) limit

E100 uf1b

Date (/time) of: b=0: begin, b=1: end of, f=0: first, f=1: last,

 u=0: lower, u=1: upper limit exceed

E101 ufnn

Duration of limit exceed (u,f: as above, nn=duration)

E110 0fnn

Duration of Π(f: as above, nn=duration)

E110 1x0x

Reserved

E110 1f1b

Date (/time) of Œ  (f,b: as above)

E111 0nnn

Multiplicative correction factor: 10nnn-6

E111 10nn

Additive correction constant: 10nn-3 · unit of VIF (offset)

E111 1100

Reserved

E111 1101

Multiplicative correction factor: 103

E111 1110

future value

E111 1111

next VIFE's and data of this block are maufacturer specific

 

Notes:

Π"Date(/time) of" or "Duration of" relates to the information which the whole data record header contains.

 The information about usage of data type F (date and time) or data type G (date) can be derived from the datafield (0010b: type G / 0100: type F).

VIFE-Codes for reports of record errors (slave to master):

 

VIFE-Code

Type of Record Error

Error Group

E000 0000

None

 

E000 0001

Too many DIFEs

 

E000 0010

Storage number not implemented

 

E000 0011

Unit number not implemented

 

E000 0100

Tariff number not implemented

DIF Errors

E000 0101

Function not implemented

 

E000 0110

Data class not implemented

 

E000 0111

Data size not implemented

 

E000 1000 to

E000 1010

Reserved

 

E000 1011

Too many VIFEs

 

E000 1100

Illegal VIF-Group

 

E000 1101

Illegal VIF-Exponent

VIF Errors

E000 1110

VIF/DIF mismatch

 

E000 1111

Unimplemented action

 

E001 0000 to

E001 0100

Reserved

 

E001 0101

No data available (undefined value)

 

E001 0110

Data overflow

 

E001 0111

Data underflow

 

E001 1000

Data error

Data Errors

E001 1001 to

E001 1011

Reserved

 

E001 1100

Premature end of record

 

E001 1101

to

E001 1111

Reserved

Other Errors

 

 

VIFE-Codes for object actions (master to slave):

 

VIFE-Code

Action

Explanation

E000 0000

Write (Replace)

replace old with new data

E000 0001

Add Value

add data to old data

E000 0010

Subtract Value

subtract data from old data

E000 0011

OR (Set Bits)

data OR old data

E000 0100

AND

data AND old data

E000 0101

XOR (Toggle Bits)

data XOR old data

E000 0110

AND NOT (Clear Bits)

NOT data AND old data

E000 0111

Clear

set data to zero

E000 1000

Add Entry

create a new data record

E000 1001

Delete Entry

delete an existing data record

E000 1010

Reserved

 

E000 1011

Freeze Data

freeze data to storage no.

E000 1100

Add to Readout-List

add data record to RSP_UD

E000 1101

Delete from Readout-List

delete data record from RSP_UD

E000 111x

Reserved

 

E001 xxxx

Reserved

 

 

Note:

The object action "write / replace" (VIFE = E000 0000) is the default and is assumed if there is no VIFE with an object action for this record.

 

8.5 References

 

[1] Färber, G. : Bussysteme, R.Oldenbourg Verlag München Wien, 1987

[2] Gabele, E., Kroll, M., Kreft, W. : Kommunikation in Rechnernetzen, Springer Verlag
Heidelberg, 1991

[3] Steffens, Andreas : Diplomarbeit " Der M-Bus - Eigenschaften und Anwendungen", University of Paderborn, Department of Physics, 1992

[4] Texas Instruments Deutschland GmbH : Data Sheet TSS 721, 1993

[5] Texas Instruments Deutschland GmbH : Seminar Material, M-Bus Workshop, 1992

[6] Ziegler, Horst : Seminar Material, M-Bus Workshop, 1992

[7] IEC 870-5-1 : Telecontrol Equipment and Systems, Part 5 Transmission Protocols, Section One - Transmission Frame Formats, 1990

[8] IEC 870-5-2 : Telecontrol Equipment and Systems, Part 5 Transmission Protocols, Section Two - Link Transmission Procedures, 1992

[9] EN1434-3: Heat Meters, Part 3 Data Exchange and Interface, 1997 §

[10] Aquametro AG Therwil : M-Bus Automatic Slave Recognition with Wildcard Algorithm, 1992

[11] Papenheim, Andreas: Diplomarbeit " Anwendungsbeispiele für den M-Bus", University of Paderborn, Department of Physics, 1993

[12] Texas Instruments Deutschland GmbH: Applications Report "Designing Applications for the Meter-Bus", 1994 (translation of reference [11])

[13] Ziegler, Horst; Froschermeier Günther: "M-Bus: Die Meßbus-Alternative", Elektronik 16/1993


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