ABB A43 User Manual page 184

Communication with M-Bus
The A-Field (address field) is used to address the recipient in the calling
A-Field
direction, and to identify the sender of information in the receiving direction.
The size of this field is one byte, and can therefore take values from 0 to 255.
The following table shows the allocation of addresses:
Address
0
1-250
251-252
253
254
255
CI-Field
The CI-field (control information) codes the type and sequence of application
data to be transmitted in the frame.
called M-bit or Mode bit, in the CI-field gives information about the
sequence in multi- byte data structures. For communication with the meter, the
Mode bit shall not be set (Mode 1) meaning the least significant byte of a multi-
byte record is transmitted first.
The following table shows the codes to be used by the master:
CI_Field codes
51h
52h
B8h
B9h
Bah
BBh
BCh
BDh
BEh
BFh
The meter uses code 72 in the CI-Field to respond to requests for user data.
A43/A44
User Manual
Description
Factory default
Can be given to meters as individual primary addresses, either via the
bus (secondary addressing) or via the buttons directly on the meter.
Reserved for future use.
Used by the secondary addressing procedure (FDh).
Used for point-to-point communication (FEh). The meter replies with its
primary address.
Used for broadcast transmissions to all meters (FFh). None of the meters
replies to a broadcast message.
Bit two (counting begins with bit 0, value 4),
Application
Data send
Selection of slaves
Set baud rate to 300
Set baud rate to 600
Set baud rate to 1200
Set baud rate to 2400
Set baud rate to 4800
Set baud rate to 9600
Set baud rate to 19200
Set baud rate to 38400
184
used byte
2CMC48001M0201
Revision: C