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Communication with M-Bus
A43/A44
194
2CMC48001M0201
User Manual
Revision: C
Send/confirm
procedure
Request/respond
procedure
Request/Respond
REQ/RSP
When the meter has received a correct telegram it waits between 35 and 80 ms
before it responds. A telegram is considered as correct if it passes the following
tests:
•
Start /Parity /Stop bits per character
•
Start /Check Sum /Stop characters per telegram format
•
In case of a long frame, the number of additional characters received match
the L-field (= L Field + 6).
•
If the received data is reasonable
The time between a response from the meter and a new message from the master
must be at least 20 ms.
SND_NKE
is used to initiate communication with the meter. When the meter
has
received an NKE followed by a REQ_UD2 (see description below), the 1st
tele-gram from the meter is sent out.
If the meter was selected for secondary addressing it will de deselected. The
value of the FCB is cleared in the meter, i.e., the meter expects that the first
telegram from a master with FCV=1 contains an FCB=1.
The meter can either confirm a correct reception with the single character ac-
knowledge E5h), or it can omit confirmation because it did not receive the
tele-gram correctly.
SND_UD
is used to send data to the meter. The meter either confirms reception
of a correct message or it omits confirmation because it did not receive the tele-
gram correctly.
REQ_UD2
is used by the master to request data from the meter.
RSP_UD
is used
by the meter to transfer data to the master. The meter indicates to the master that
more data will follow in the next telegram by sending 1Fh as the last user data.
If the meter does not respond to the REQ_UD2, it’s an indication that the
message was not received correctly or that the address does not match.
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 ...
Page 154: ...Communication with Modbus A43 A44 154 2CMC48001M0201 User Manual Revision C ...
Page 157: ...Communication with Modbus 2CMC48001M0201 157 A43 A44 Revision C User Manual ...
Page 161: ...Communication with Modbus 2CMC48001M0201 161 A43 A44 Revision C User Manual ...
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 ...
Page 188: ...Communication with M Bus A43 A44 188 2CMC48001M0201 User Manual Revision C ...
Page 195: ...Communication with M Bus 2CMC48001M0201 195 A43 A44 Revision C User Manual ...
Page 254: ...Communication with M Bus A43 A44 254 2CMC48001M0201 User Manual Revision C ...
Page 257: ...Communication with M Bus 2CMC48001M0201 257 A43 A44 Revision C User Manual ...