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Communication with M-Bus
A43/A44
274
2CMC48001M0201
User Manual
Revision: C
10.5 Sending Data to the Meter
General
This section describes the telegrams that can be sent to an EQ meter. Some of the
telegrams contain data, others do not. Data sent in the telegram is sometimes
stored in the meter, sometimes used by the meter to perform a certain action.
Telegrams that contains no data usually initiates a certain action in the meter.
Write access
level protection
Some of the commands can be protected by a password. There are 3
different levels of write access level protection:
•
Open
•
Open by password
•
Closed
10.5.1 Set tariff
The write access level can be set either via the buttons directly on the meter or
via communication using the
set write access level
command.
If the access level is set to
Open
, the meter will always accept the command as
long as the the meter is properly addressed and the syntax and checksum are
cor-rect.
If the access level is set to
Open by password
the specific command sent to the
meter must be preceded by a
send password
command in order for the meter to
accept the command.
If the access level is set to
Closed
the meter will not accept any command, but will
just return an acknowledge character (E5 hex). To change this access level pro-
tection, the access level has to be set to
Open
via the buttons directly on the meter.
Note
–
Commands that are not affected by the write access level protection only
require
a correct message with correct address, syntax and checksum to be accepted.
For meters with tariff control the active tariff is set by sending the following
com-mand (all values are hexadecimal). The command is not affected by the
write protection level set.
Byte No.
Size
Value
Description
1
1
68
Start character
2
1
07
L-field, calculated from C field to last user data
3
1
07
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
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 ...
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