ABB A43 User Manual

Communication with M-Bus
A43/A44 266 2CMC48001M0201
User Manual Revision: C
Byte No.
Size
Value
Description
2
1
08
L-field, calculated from C field to last user data
3
1
08
L-field, repeated
4
1
68
Start character
5
1
53/73
C-field, SND_UD
6
1
xx
A-field, address
7
1
51
CI-field, data send, LSB first
8
1
01
DIF size, 8 bit integer
9
1
FF
VIF next byte is manufacturer specific
10
1
F9
VIF extension of manufacturer specific VIFE's, next VIFE
specifies actual meaning
11
1
2D
VIFE specifies voltage harmonics
12
1
xx
Phase number 1-3, 5-7 where 1-3 is used for the three
phase to neutral voltages and 5-7 is for the phase to
phase voltages L1-L2, L3-L2, L1-L3
13
1
xx
CS checksum, calculated from C field to last data
14
1
16
Stop character
About the data The meter will send out harmonic data for one phase in each telegram, which sent out
means 6 telegrams in a 3-element meter, 3 telegrams in a 2-element meter and 1
telegram in a single phase meter.
Data sent out will be the total harmonic distortion and the harmonics with num-
bers 2-16. Note that the total harmonic distortion is calculated from the
harmonics measured and is thus not the true total harmonic distortion, which
would require all harmonics (up to infinite frequency) to be measured.
10.4.6.1 Examples of readout of voltage harmonics data
Example 1
The readout telegram for voltage phase harmonic contains the following data:
Byte No.
Size
Value
Description
1
1
68
Start character
2
1
C0
L-field, calculated from C field to last user data
3
1
C0
L-field, repeated
4
1
68
Start character
5
1
08
C-field, RSP_UD
6
1
xx
A-field, address
7
1
72
CI-field, data send, LSB first
8-11
4
xxxxxxxx
identification number, 8 BCD digits
12-13
2
4204
Manufacturer: ABB
14
1
xx
Protocol version
15
1
02
Medium, 02=electricity
16
1
xx
Access number

ABB A43 Specifications

General

Brand	ABB
Model	A43
Category	Measuring Instruments
Language	English