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7.1 Communication connection diagram
When connecting the meters in multidrop communication
network, the following methods are to be adopted for trouble free
communication.
1. Loop Topology
In this method, the communication continous to work even if
there is a breakage in any one of the Loop. Termination resistors are
not required.
2. Straight line Topology
In this method termination resistor RT (60 -100 ) of value
equal to characteristic Impedance of the cable used may be required
to avoid reflection loses.
It is recommended to use proper & suitable communication cable
for trouble free communication.
Master
D+ D-
....
Meter 1
D+ D-
Meter 2
D+ D-
Meter 3
D+ D-
Meter N
D+ D-
RT
RT
Master
D+ D-
Meter 1
D+ D-
Meter 2
D+ D-
Meter 3
D+ D-
Meter N
D+ D-
Meter 1
D+ D-
Meter 2
D+ D-
Meter 3
D+ D-
Meter N
D+ D-
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