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7. Communication Port Details
The Meter is provided with a optically Isolated RS 485
communication Port, which is an optional Feature and has to be
specified at the time of ordering. The communication protocol used is
MODBUS - RTU or MODBUS-ASCII (to be specified while ordering). Using
the communication Port, the meters can be connected in multi drop
network and data can be collected in a centralised control room using
any standard SCADA Software.
The communication between the PC and the instrument would
be in Master slave mode. P.C acts as a master and sends a command
message (query) containing the slave Id, function code and address of
the information required. The command is received by all the slaves.
The slave whose address is matching with that of the command address
would respond with the requested data.
The communication settings are,
Protocol
:
MODBUS RTU
Data bit
:
8
Data Type
:
UINT
Baud rate
:
9600
Parity
:
None
Stop bit
:
1
Starting Address
:
40001
Communicating mode
:
Half Duplex
The above configuration are to be done in any standard scada
package for collecting the data.
The instrument is provided with screwable 2 pin phoenix
connector for connecting the communication cable at the rear side.
Note :
kWh or kVAh are shown in the same address which ever is
selected in program mode
