Infrastructure/Communication Networks/RS-485

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Some workplace installation of the GridLab have a local RS-485 network. This type of network is mainly used to communicate between several devices of the same type and ends usually with a RS-485 to TCP/IP gateway or something like that.

Usage within the district units

The power meters SICAM P50, which are a part of the District Units, uses such a RS-485 network. The communication between a master device and the power meters happens over a Exsys EX-6051 RS-485 to TCP/IP gateway. The configuration of that gateway may be found in the device description of the Exsys EX-6051 and the IP address list.

Protocol

The used protocol is Modbus RTU. The protocol parameters are listed below.

Paramter Value
Protocol Modbus RTU
Baudrate 115200Bd/s
Parity None
Flow Control None

Addressing

The addressing of the power meters consists of two digits. The tens indicates the District Unit of the power meter and the units the power meter within the District Unit. So for example the address of the the power meter 4 of the District Unit 2 is 24.

Hardware

Description of the connecting cable

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