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Communication with Modbus
2CMC48001M0201
99
A43/A44
Revision: C
User Manual
9.1 Bus Description
General
Modbus communication in the A series meters is done on a 3-wire (A, B and
Common) polarity dependent bus according to the RS-485 standard. Maximum
number of meters connected to one physical bus is 247 (which is the same as the
individual device address range in Modbus).
Topology
The RS-485 bus uses line topology, see figure below. Stubs at the meter connec-
tions are allowed but should be kept as short as possible and no longer than 1 m.
Bus termination in both ends of the line should be used. The resistors should have
the same values as the characteristic impedance of the cable which normally is
120 ohm.
Cable
Cable used is non shielded or shielded twisted pair cable with wire area of 0.35-
1.5 mm
2
. If shielded cable is used the shield should be connected to ground in one
end. Maximum length of the bus is 700 m.
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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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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