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Communication with M-Bus
2CMC48001M0201
183
A43/A44
Revision: C
User Manual
The C-Field
The C-Field (control field) contains information about the direction of the data
flow and error handling. Besides labeling the functions and the actions caused by
them, the control field specifies the direction of data flow and is responsible for
various parts of the communication to and from the meter.
The following table shows the coding of the C-Field:
Bit No.
7
6
5
4
3
2
1
0
To meter
0
PRM
FCB
FCV
F3
F2
F1
F0
From meter
0
PRM
0
0
F3
F2
F1
F0
The primary message bit (
PRM
) is used to specify the direction of the data
flow.It is set to 1 when a telegram is sent from a master to the meter and to 0 in
the other direction.
The frame count bit valid (
FCV
) is set to 1 by the master to indicate that the frame
count bit (
FCB
) is used. When the FCV is set to 0, the meter ignores the FCB.
The FCB is used to indicate successful transmission procedures. A master shall
toggle the bit after a successful reception of a reply from the meter. If the
expected reply is missing, or the reception of it is faulty, the master resends the
same tele-gram with the same FCB. The meter answers, to a REQ_UD2-request
with tog-gled FCB and a set FCV, with a RSP_UD containing the next telegram
of a multi-telegram answer. If the FCB is not toggled it will repeat the last
telegram. The actual values will be updated in a repeated telegram.
On receipt of a SND_NKE the meter clears the FCB. The meter uses the same
FCB for primary addressing, secondary addressing and point-to-point
communi-cation.
The bits 0 to 3 (F0, F1, F2 and F3) of the control field are the function code of
the message. The following table shows the function codes:
Comand
C-Field
C-Field
Telegram
Description
(binary)
(hex)
SND_NKE
0100 0000
40
Short frame
Initialization of meter
SND_UD
01F1 0011
53/73
Long frame
Send user data to meter
REQ_UD2
01F1 1011
5b
Short frame
Request for class 2 data
RSP_UD
0000 1000
08
Long frame
Data transfer form meter to
master after request.
Summary of Contents for A43
Page 1: ...A43 A44 User Manual ...
Page 40: ...Meter Settings A43 A44 40 2CMC48001M0201 User Manual Revision C ...
Page 55: ...Technical Description 2CMC48001M0201 55 A43 A44 Revision C User Manual ...
Page 58: ...Technical Description A43 A44 58 2CMC48001M0201 User Manual Revision C ...
Page 61: ...Technical Description 2CMC48001M0201 61 A43 A44 Revision C User Manual ...
Page 75: ...Technical Description 2CMC48001M0201 75 A43 A44 Revision C User Manual ...
Page 84: ...Measurement Methods A43 A44 84 2CMC48001M0201 User Manual Revision C ...
Page 91: ...Measurement Methods 2CMC48001M0201 91 A43 A44 Revision C User Manual ...
Page 95: ...Measurement Methods 2CMC48001M0201 95 A43 A44 Revision C User Manual ...
Page 102: ...Communication with Modbus A43 A44 102 2CMC48001M0201 User Manual Revision C ...
Page 107: ...Communication with Modbus 2CMC48001M0201 107 A43 A44 Revision C User Manual ...
Page 131: ...Communication with Modbus 2CMC48001M0201 131 A43 A44 Revision C User Manual ...
Page 147: ...Communication with Modbus 2CMC48001M0201 147 A43 A44 Revision C User Manual ...
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Page 166: ...Communication with Modbus A43 A44 166 2CMC48001M0201 User Manual Revision C ...
Page 180: ...Communication with M Bus A43 A44 180 2CMC48001M0201 User Manual Revision C ...
Page 182: ...Communication with M Bus A43 A44 182 2CMC48001M0201 User Manual Revision C ...
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