ABB A43

Communication with M-Bus
2CMC48001M0201 229 A43/A44
Revision: C User Manual
10.4 Special Readout of Meter
Data
Introduction
Readable data
Date, date/time
format
Some data in the meter can only be read by first sending a SND_UD followed
by a REQ_UD2.
Note – An NKE should always be sent before sending any of the commands
described below. If the meter is in the middle of another special data readout
process it will not respond correctly to the command.
After reading the first telegram, it is possible to continue reading by sending
re-peated REQ_UD2 commands
If the data item that has been read is normal and without any specific status asso-
ciated with it, no status-VIFE or 0 will be sent out. If the status is “data error” or
“no data available”, the standard M-Bus status coding will be sent out (18 hex or
15 hex).
The data that can be read in this way is:
• Load profile
• Demand
• Previous values
• Logs
• Harmonics
In some cases data specifying date or date/time is contained in the read
request command.
The format for date used in the commands is M-Bus data type G:
Day in bits 0-4
Valid values 1-31
Months in bits 8-11
Valid values 1-12
Year in bits 5-7 and 12-15 (bits 5-7 are the LSB bits)
Valid values 1-99
The format for date/time is 6 bytes BCD or M-Bus data type F. M-Bus data
type F consists of
Minutes in bits 0-5
Valid values 0-59
Hours in bits 8-12
Valid values 0-23
Day in bits 16-20
Valid values 1-31
Months in bits 24-27
Valid values 1-12
Year in bits 21-23 and 28-31 (MSB bits)
Valid values 0-99
If a date or date/time is specified in the command, the meter sends out data for that
period. If no data is stored in the meter for the specified period, the meter will